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Yulin Gao - One of the best experts on this subject based on the ideXlab platform.
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Behavioral Responses of Thrips Hawaiiensis (Thysanoptera: Thripidae) to Volatile Compounds Identified from Gardenia jasminoides Ellis (Gentianales: Rubiaceae)
Insects, 2020Co-Authors: Yu Cao, Wang Lijuan, Jie Wang, Giacinto Salvatore Germinara, Hong Yang, Yulin GaoAbstract:Thrips Hawaiiensis is a common Thrips pest of various plant flowers with host preference. Plant volatiles provide important information for host-searching in insects. We examined the behavioral responses of T. Hawaiiensis adults to the floral volatiles of Gardenia jasminoides Ellis, Gerbera jamesonii Bolus, Paeonia lactiflora Pallas, and Rosa chinensis Jacq. in a Y-tube olfactometer. T. Hawaiiensis adults showed significantly different preferences to these four-flower plants, with the ranking of G. jasminoides > G. jamesonii > P. lactiflora ≥ R. chinensis. Further, 29 components were identified in the volatile profiles of G. jasminoides, and (Z)-3-hexenyl tiglate (14.38 %), linalool (27.45 %), and (E3,E7)-4,8,12-trimethyltrideca-1,3,7,11-tetraene (24.67 %) were the most abundant. Six-arm olfactometer bioassays showed that T. Hawaiiensis had significant positive responses to (Z)-3-hexenyl tiglate, linalool, and (E3,E7)-4,8,12-trimethyltrideca-1,3,7,11-tetraene tested at various concentrations, with the most attractive ones being 10−3 μL/μL, 10−2 μL/μL and 100 μg/μL for each compound, respectively. In pairing of these three compounds at their optimal concentrations, T. Hawaiiensis showed the preference ranking of (Z)-3-hexenyl tiglate > linalool > (E3,E7)-4,8,12-trimethyltrideca-1,3,7,11-tetraene. Large numbers of T. Hawaiiensis have been observed on G. jasminoides flowers in the field, which might be caused by the high attraction of this pest to G. jasminoides floral volatiles shown in the present study. Our findings shed light on the olfactory cues routing host plant searching behavior in T. Hawaiiensis, providing important information on how T. Hawaiiensis targets particular host plants. The high attractiveness of the main compounds (e.g., linalool, (E3,E7)-4,8,12-trimethyltrideca-1,3,7,11-tetraene, particular (Z)-3-hexenyl tiglate) identified from volatiles of G. jasminoides flowers may be exploited further to develop novel monitoring and control tools (e.g., lure and kill strategies) against this flower-inhabiting Thrips pest.
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Flower injection of imidacloprid and spirotetramat: a novel tool for the management of banana Thrips Thrips Hawaiiensis
Journal of Pest Science, 2020Co-Authors: Qiu Haiyan, Liangde Tang, Dongqiang Zeng, Kui Liu, Yulin GaoAbstract:The banana Thrips (Thrips Hawaiiensis), which is one of the most common flower-inhabiting Thrips, currently causes serious damage to banana trees in China. As spray treatments have low efficacy to control this Thrips pest, changing to new control measures are crucial. Among the available approaches, injection of a systemic insecticide is considered suitable. However, little is known about this approach up to now. Between 2014 and 2018, imidacloprid and spirotetramat were applied via flower injection and evaluated for their potential to control the Thrips. In 2014, laboratory bioassays together with field experiments revealed that imidacloprid and spirotetramat injected at recommended dose appeared to be effective in controlling the Thrips, supporting the idea of flower injection. Thereafter, a 2-year study (2015–2016) of spirotetramat showed that higher injection rates resulted in greater mortality and better field efficacy against the Thrips when flower injection was utilized. Another 2-year (2017–2018) field trial indicated that either imidacloprid or spirotetramat injection exhibited significantly higher efficacy and had no negative effects on fruit yield when compared to spinetoram spray. Results also showed that the efficacy of the flower injection was not influenced by banana species and phenological conditions. Moreover, the fast uptake of imidacloprid and spirotetramat in flower samples could account for their lethal activity against the Thrips in bioassays. Notably, these two products degraded quickly in the young fruit and no residue was detected within the ripe fruit, implying that the flower injection might not present a risk to contaminate fruit. Overall, these findings taken together represent for the first time that flower injection of imidacloprid and spirotetramat can be regarded as a new alternative to control the banana Thrips effectively.
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Analysis of seasonal and annual field-evolved insecticide resistance in populations of Thrips Hawaiiensis in banana orchards
Journal of Pest Science, 2019Co-Authors: Qiu Haiyan, Liangde Tang, Dongqiang Zeng, Kui Liu, Yulin GaoAbstract:Every season over the past decade, efficacious Thrips insecticides have been commonly applied for control of Thrips Hawaiiensis on banana crops in China. For effective Thrips control, some insecticides have been used extensively against the Thrips in numerous banana plantations. This study aims to examine the current resistance status and the dynamics regarding the changing frequencies of resistance in the field T. Hawaiiensis populations. A total of 13 field samples from banana orchards (Chengmai, Lingao, Dongfang and Ledong located in Hainan Province, China) were collected monthly in 2014 to 2017, and selected individuals were used in bioassays assessing insecticide resistance and metabolic enzyme activity compared to a laboratory-susceptible strain. In 2014, the initial resistance survey found that all sampled populations were susceptible to spirotetramat and cyantraniliprole, while Lingao and Chengmai population showed a moderate resistance to imidacloprid, acetamiprid, abamectin and spinetoram. Further, seasonal and annual analysis of resistance dynamics with imidacloprid, abamectin and spinetoram demonstrated that resistance in field populations of T. Hawaiiensis developed quickly within a season (from April to August 2016), but resistance was unstable over subsequent seasons (April 2015, 2016 and 2017). Moreover, synergism experiments using enzyme inhibitors together with metabolic enzyme assays revealed that field-evolved insecticide resistance in T. Hawaiiensis was closely associated with the elevated metabolic enzymes. The observed resistance increase within a season was attributed mainly to the intense use of these insecticides and short generation time of Thrips. These findings suggest that a rotation system using efficacious Thrips insecticides should be implemented for sustainable Thrips control to reduce the potential of resistance development.
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Oviposition, feeding preference, and biological performance of Thrips Hawaiiensis on four host plants with and without supplemental foods
Arthropod-Plant Interactions, 2018Co-Authors: Qiu Haiyan, Liangde Tang, Dongqiang Zeng, Kui Liu, Yulin GaoAbstract:Thrips Hawaiiensis is a polyphagous flower-inhabiting insect pest that causes considerable damage to numerous plants worldwide. However, not much is known about the interaction between this Thrips species and its host plants. In the present study, laboratory experiments were performed to determine the oviposition and feeding preferences and compare the biological performance of T. Hawaiiensis on four host plants with and without supplemental foods. In the choice tests, when compared with mango and tea petals and bean pods, the T. Hawaiiensis population showed stronger oviposition and feeding preferences for banana petals. Under laboratory conditions, the T. Hawaiiensis population reared on banana petals showed a significantly faster development, longer lifespan, and higher survival and fecundity levels than the populations reared on the other three host plants. Diets with supplemental foods (honey solution or tea pollen) reduced the developmental time, prolonged the longevity and enhanced the fecundity of T. Hawaiiensis compared with banana petals alone. These findings indicate that the banana flower is an optimal host to increase the T. Hawaiiensis population and suggest that additional foods, such as honey solution or tea pollen, are beneficial to the population performance of this species. More importantly, knowledge of the benefits of supplemental foods on predator–prey interactions and their potential use in biological control programs are also discussed. Overall, the present study improves our understanding of the ecological features of T. Hawaiiensis and provides useful information on the interaction of T. Hawaiiensis and its host plants. In the future, these contributions can help establish a better integrated pest management (IPM) control program for Thrips.
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Resistance development, stability, cross-resistance potential, biological fitness and biochemical mechanisms of spinetoram resistance in Thrips Hawaiiensis (Thysanoptera: Thripidae).
Pest management science, 2018Co-Authors: Qiu Haiyan, Liangde Tang, Dongqiang Zeng, Kui Liu, Yulin GaoAbstract:BACKGROUND Spinetoram, a new type of spinosyn with novel modes of action, has been used in effective Thrips control programs, but resistance remains a threat. In the present study, a laboratory Thrips Hawaiiensis population was subjected to spinetoram for resistance selection to investigate resistance development, stability, cross-resistance potential, biological fitness and underlying biochemical mechanisms. RESULTS Resistance to spinetoram in T. Hawaiiensis rapidly increased 103.56-fold (for 20 generations of selection with spinetoram) compared with a laboratory susceptible population, and the average realized heritability (h2 ) of resistance was calculated as 0.1317. Maintaining the resistant population for five generations without any further selection pressure resulted in a decline in the resistance ratio from 19.42- to 9.50-fold, suggesting that spinetoram resistance in T. Hawaiiensis is unstable. Moreover, the spinetoram-resistant population exhibited a lack of cross-resistance to other classes of insecticides, and showed biological fitness costs. The results of synergism experiments using enzyme inhibitors and biochemical analyses revealed that metabolic mechanisms might not be responsible for the development of spinetoram resistance in T. Hawaiiensis. CONCLUSION The current study expands understanding of spinosyn resistance in Thrips species, providing a basis for proposing better integrated pest management strageties for Thrips control programs and defining the most appropriate tools for such resistance management. © 2018 Society of Chemical Industry.
Ziyin Yang - One of the best experts on this subject based on the ideXlab platform.
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Correction: Insects (Thrips Hawaiiensis (Morgan)) change the stereochemical configuration of 1-phenylethanol emitted from tea (Camellia sinensis) flowers
RSC Advances, 2020Co-Authors: Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Qiyuan Peng, Jinchi Tang, Naoharu Watanabe, Ziyin YangAbstract:Correction for ‘Insects (Thrips Hawaiiensis (Morgan)) change the stereochemical configuration of 1-phenylethanol emitted from tea (Camellia sinensis) flowers’ by Ying Zhou et al., RSC Adv., 2017, 7, 32336–32343. DOI: 10.1039/C7RA03219F.
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Functional characterization of an allene oxide synthase involved in biosynthesis of jasmonic acid and its influence on metabolite profiles and ethylene formation in tea (Camellia sinensis) flowers.
International journal of molecular sciences, 2018Co-Authors: Qiyuan Peng, Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Jinchi Tang, Yongxia Jia, Ziyin YangAbstract:Jasmonic acid (JA) is reportedly involved in the interaction between insects and the vegetative parts of horticultural crops; less attention has, however, been paid to its involvement in the interaction between insects and the floral parts of horticultural crops. Previously, we investigated the allene oxide synthase 2 (AOS2) gene that was found to be the only JA synthesis gene upregulated in tea (Camellia sinensis) flowers exposed to insect (Thrips Hawaiiensis (Morgan)) attacks. In our present study, transient expression analysis in Nicotiana benthamiana plants confirmed that CsAOS2 functioned in JA synthesis and was located in the chloroplast membrane. In contrast to tea leaves, the metabolite profiles of tea flowers were not significantly affected by 10 h JA (2.5 mM) treatment as determined using ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry, and gas chromatography-mass spectrometry. Moreover, JA treatment did not significantly influence ethylene formation in tea flowers. These results suggest that JA in tea flowers may have different functions from JA in tea leaves and other flowers.
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insects Thrips Hawaiiensis morgan change the stereochemical configuration of 1 phenylethanol emitted from tea camellia sinensis flowers
RSC Advances, 2017Co-Authors: Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Qiyuan Peng, Jinchi Tang, Naoharu Watanabe, Jianlong Li, Ziyin YangAbstract:Insect attacks change the quantity of volatiles emitted from plants, but little is known about the effects on the volatiles' stereochemical configurations. 1-Phenylethanol (1PE) is a major internal volatile of tea (Camellia sinensis) flowers. In the present study, insect-damaged C. sinensis flowers in the field emitted a different (R)-/(S)-1PE pattern than that emitted from undamaged flowers. Laboratory experiments showed that changes in the (R)-/(S)-1PE ratio were caused by treatments with Thrips Hawaiiensis (Morgan), a pest of cut flowers and vegetable crops. These treatments led to an increase in jasmonic acid (JA) through the activation of allene oxide synthase, which is involved in JA biosynthesis. Exposing flowers to exogenous JA induced an (R)-/(S)-1PE emission pattern that was similar to that induced by a T. Hawaiiensis attack, suggesting that JA was involved in the changes in the stereochemical configuration of 1PE emitted from the flowers after insect treatments. This study provides new insights into the involvement of volatiles in interactions between plants and insects, showing that not only the quantity but also the stereochemical configuration of plant volatiles is affected by insects.
Ying Zhou - One of the best experts on this subject based on the ideXlab platform.
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Correction: Insects (Thrips Hawaiiensis (Morgan)) change the stereochemical configuration of 1-phenylethanol emitted from tea (Camellia sinensis) flowers
RSC Advances, 2020Co-Authors: Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Qiyuan Peng, Jinchi Tang, Naoharu Watanabe, Ziyin YangAbstract:Correction for ‘Insects (Thrips Hawaiiensis (Morgan)) change the stereochemical configuration of 1-phenylethanol emitted from tea (Camellia sinensis) flowers’ by Ying Zhou et al., RSC Adv., 2017, 7, 32336–32343. DOI: 10.1039/C7RA03219F.
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Functional characterization of an allene oxide synthase involved in biosynthesis of jasmonic acid and its influence on metabolite profiles and ethylene formation in tea (Camellia sinensis) flowers.
International journal of molecular sciences, 2018Co-Authors: Qiyuan Peng, Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Jinchi Tang, Yongxia Jia, Ziyin YangAbstract:Jasmonic acid (JA) is reportedly involved in the interaction between insects and the vegetative parts of horticultural crops; less attention has, however, been paid to its involvement in the interaction between insects and the floral parts of horticultural crops. Previously, we investigated the allene oxide synthase 2 (AOS2) gene that was found to be the only JA synthesis gene upregulated in tea (Camellia sinensis) flowers exposed to insect (Thrips Hawaiiensis (Morgan)) attacks. In our present study, transient expression analysis in Nicotiana benthamiana plants confirmed that CsAOS2 functioned in JA synthesis and was located in the chloroplast membrane. In contrast to tea leaves, the metabolite profiles of tea flowers were not significantly affected by 10 h JA (2.5 mM) treatment as determined using ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry, and gas chromatography-mass spectrometry. Moreover, JA treatment did not significantly influence ethylene formation in tea flowers. These results suggest that JA in tea flowers may have different functions from JA in tea leaves and other flowers.
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insects Thrips Hawaiiensis morgan change the stereochemical configuration of 1 phenylethanol emitted from tea camellia sinensis flowers
RSC Advances, 2017Co-Authors: Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Qiyuan Peng, Jinchi Tang, Naoharu Watanabe, Jianlong Li, Ziyin YangAbstract:Insect attacks change the quantity of volatiles emitted from plants, but little is known about the effects on the volatiles' stereochemical configurations. 1-Phenylethanol (1PE) is a major internal volatile of tea (Camellia sinensis) flowers. In the present study, insect-damaged C. sinensis flowers in the field emitted a different (R)-/(S)-1PE pattern than that emitted from undamaged flowers. Laboratory experiments showed that changes in the (R)-/(S)-1PE ratio were caused by treatments with Thrips Hawaiiensis (Morgan), a pest of cut flowers and vegetable crops. These treatments led to an increase in jasmonic acid (JA) through the activation of allene oxide synthase, which is involved in JA biosynthesis. Exposing flowers to exogenous JA induced an (R)-/(S)-1PE emission pattern that was similar to that induced by a T. Hawaiiensis attack, suggesting that JA was involved in the changes in the stereochemical configuration of 1PE emitted from the flowers after insect treatments. This study provides new insights into the involvement of volatiles in interactions between plants and insects, showing that not only the quantity but also the stereochemical configuration of plant volatiles is affected by insects.
Ekrem Atakan - One of the best experts on this subject based on the ideXlab platform.
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Pest status of the Hawaiian flower Thrips, Thrips Hawaiiensis (Morgan) (Thysanoptera: Thripidae) in lemons in the Mediterranean region of Turkey
Phytoparasitica, 2021Co-Authors: Ekrem Atakan, Serkan Pehlivan, Tange Denis AchiriAbstract:The Hawaiian flower Thrips, Thrips Hawaiiensis (Morgan) (Thysanoptera: Thripidae), is a polyphagous and widespread pest in tropical and temperate regions. In 2015, T. Hawaiiensis was detected in lemon orchards from Turkey. In this study, the seasonal trend, damages in lemon fruit and potential alternative host plants were studied in three lemon orchards from 2018 to 2019. Thrips Hawaiiensis density started to increase after petal fall and peaked in mid- or late May. A few T. Hawaiiensis adults were collected in mid-June. The highest percentages of scarred fruits were 36% and 28% in 2018 and 2019, respectively. The critical period to control T. Hawaiiensis was determined as 3–5 weeks after petal fall. During this period, the fruits are about 2–3 cm in diameter, and are susceptible to the Thrips feeding activity.
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Türkiye’nin Doğu Akdeniz Bölgesi’nde Limonlarda Zararlı Bir Thrips Türü: Thrips Hawaiiensis (Morgan) (Thysanoptera: Thripidae)
Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi, 2020Co-Authors: Ekrem Atakan, Serkan PehlivanAbstract:Bazi Thrips turlerinin ozellikle genc turuncgil meyvelerinde zararli olduklari bilinmektedir. Bu amacla, Thrips surveyleri, Adana ve Mersin illerinde, ciceklenme doneminden baslayarak limon meyveleri 4-5 cm capina gelinceye kadar donemde yurutulmustur. Her bahcede tesadufu olarak 100 meyve Thrips zarari yonunden incelenmistir. Toplam 13 Thysanoptera turu bulunmustur. Adana ilinde farkli turuncgil cesitlerinde Frankliniella occidentalis (Pergande) cok yaygin olarak bulunurken, Mersin ilinde limonlarda Thrips Hawaiiensis (Morgan) ana Thrips turu olmustur. F. occidentalis ’in yaygin oldugu yerlerde Thrips zarari gorulmemistir. T . Hawaiiensis limon ciceklerinde meyvelerinde zararli bir tur olarak ortaya cikmistir. Thrips ciceklerde ve meyvelerde gumusu veya bronzlasmis lekelere neden olmustur. Thrips zarari cicek petal yapraklarinin dokumunden sonraki 3. veya 4. haftalarda, mayis ayi ortalarinda gozlenmistir. T . Hawaiiensis nedeniyle orneklenen limon meyvelerinde lekelenme orani %20 ile %34 arasinda degismistir.
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turkiye nin dogu akdeniz bolgesi nde limonlarda zararli bir Thrips turu Thrips Hawaiiensis morgan thysanoptera thripidae
Kahramanmaraş Sütçü İmam Üniversitesi Tarım ve Doğa Dergisi, 2020Co-Authors: Ekrem Atakan, Serkan PehlivanAbstract:Bazi Thrips turlerinin ozellikle genc turuncgil meyvelerinde zararli olduklari bilinmektedir. Bu amacla, Thrips surveyleri, Adana ve Mersin illerinde, ciceklenme doneminden baslayarak limon meyveleri 4-5 cm capina gelinceye kadar donemde yurutulmustur. Her bahcede tesadufu olarak 100 meyve Thrips zarari yonunden incelenmistir. Toplam 13 Thysanoptera turu bulunmustur. Adana ilinde farkli turuncgil cesitlerinde Frankliniella occidentalis (Pergande) cok yaygin olarak bulunurken, Mersin ilinde limonlarda Thrips Hawaiiensis (Morgan) ana Thrips turu olmustur. F. occidentalis ’in yaygin oldugu yerlerde Thrips zarari gorulmemistir. T . Hawaiiensis limon ciceklerinde meyvelerinde zararli bir tur olarak ortaya cikmistir. Thrips ciceklerde ve meyvelerde gumusu veya bronzlasmis lekelere neden olmustur. Thrips zarari cicek petal yapraklarinin dokumunden sonraki 3. veya 4. haftalarda, mayis ayi ortalarinda gozlenmistir. T . Hawaiiensis nedeniyle orneklenen limon meyvelerinde lekelenme orani %20 ile %34 arasinda degismistir.
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Distribution and seasonal abundance of predatory bugs, Orius spp. (Hemiptera: Anthocoridae) in Adana Province, Turkey
Turkish Journal of Entomology, 2019Co-Authors: Serkan Pehlivan, Ekrem AtakanAbstract:Orius species are considered effective biological control agents of Thrips both in fields and greenhouses worldwide. The seasonal abundance and distributions of Orius and Thrips species were determined from different arable crops and weeds in Adana Province in 2015-2016. In this study, a total of six species of genus Orius namely, Orius albidipennis (Reuter,1884), Orius horvathi (Reuter,1884), Orius laevigatus (Fieber, 1860), Orius minutus (L., 1758), Orius niger (Wolff, 1881) and Orius vicinus (Ribaut, 1923) (Hemiptera: Anthocoridae) were identified. Orius niger was the most common predatory Anthocorid species with 1944 specimens, and followed by O. laevigatus with 447 specimens. While, O. laevigatus and O. niger were found to be active throughout the year, O. vicinus was only active in spring and summer, and the other Orius spp. were collected in summer. The predatory bugs were mostly found with the pestiferous Thrips, Frankliniella occidentalis Pergande, 1895 and Thrips Hawaiiensis (Morgan, 1913) (Thysanoptera: Thripidae) in diverse agricultural areas. Alfalfa, faba bean and sunflower were determined as a crucial host plant for Orius spp. Also, sesame could be potential companion (trap or banker) plant to support the predatory bugs in augmentative and conservative biological control strategies. Of the weeds sampled, Glebionis segetum Fourr. and Sinapis arvensis L. were the most colonized by Orius spp. From results it is concluded that O. niger and O. laevigatus are well adapted to the geographical conditions and plant biodiversity in Adana Province. Therefore, these predatory bugs could be crucial biological control agents of Thrips species in field crops.
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turkiye de yeni zararli bir Thrips turu Thrips Hawaiiensis morgan 1913 thysanoptera thripidae
Türkiye Entomoloji Bülteni, 2015Co-Authors: Ekrem Atakan, Serkan Pehlivan, Murat Olculu, Serdar SatarAbstract:Hawaii cicek Thripsi, Thrips Hawaiiensis (Morgan, 1913) (Thysanoptera: Thripidae) Turkiye’de ilk kez Mersin ilinde 2015 yilinda limonlarda kaydedilmistir. T. Hawaiiensis limon ve nektarin meyvelerinde meyve yuzeyinde gumusumsu lekelere ve sekil bozukluklarina neden olmustur. Limonlardaki tipik zarari yil boyunca ciceklenen “Yediveren” grubu limonlarda yaygin olarak gozlenmistir. Zararlinin ilk saptanmasindan sonra, Dogu Akdeniz Bolgesi’nde hizli bir sekilde yayildigi saptanmistir. Bu Thrips turu bazi sebze, sus bitkileri, pamuk soya, susam ve aycicegi gibi tarla urunlerinde de kaydedilmistir. Zararlinin taninmasi, biyolojisi, zarar sekli ve yayilisi hakkinda bilgiler sunulmustur.
Qiyuan Peng - One of the best experts on this subject based on the ideXlab platform.
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Correction: Insects (Thrips Hawaiiensis (Morgan)) change the stereochemical configuration of 1-phenylethanol emitted from tea (Camellia sinensis) flowers
RSC Advances, 2020Co-Authors: Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Qiyuan Peng, Jinchi Tang, Naoharu Watanabe, Ziyin YangAbstract:Correction for ‘Insects (Thrips Hawaiiensis (Morgan)) change the stereochemical configuration of 1-phenylethanol emitted from tea (Camellia sinensis) flowers’ by Ying Zhou et al., RSC Adv., 2017, 7, 32336–32343. DOI: 10.1039/C7RA03219F.
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Functional characterization of an allene oxide synthase involved in biosynthesis of jasmonic acid and its influence on metabolite profiles and ethylene formation in tea (Camellia sinensis) flowers.
International journal of molecular sciences, 2018Co-Authors: Qiyuan Peng, Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Jinchi Tang, Yongxia Jia, Ziyin YangAbstract:Jasmonic acid (JA) is reportedly involved in the interaction between insects and the vegetative parts of horticultural crops; less attention has, however, been paid to its involvement in the interaction between insects and the floral parts of horticultural crops. Previously, we investigated the allene oxide synthase 2 (AOS2) gene that was found to be the only JA synthesis gene upregulated in tea (Camellia sinensis) flowers exposed to insect (Thrips Hawaiiensis (Morgan)) attacks. In our present study, transient expression analysis in Nicotiana benthamiana plants confirmed that CsAOS2 functioned in JA synthesis and was located in the chloroplast membrane. In contrast to tea leaves, the metabolite profiles of tea flowers were not significantly affected by 10 h JA (2.5 mM) treatment as determined using ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry, and gas chromatography-mass spectrometry. Moreover, JA treatment did not significantly influence ethylene formation in tea flowers. These results suggest that JA in tea flowers may have different functions from JA in tea leaves and other flowers.
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insects Thrips Hawaiiensis morgan change the stereochemical configuration of 1 phenylethanol emitted from tea camellia sinensis flowers
RSC Advances, 2017Co-Authors: Ying Zhou, Lanting Zeng, Yinyin Liao, Fang Dong, Qiyuan Peng, Jinchi Tang, Naoharu Watanabe, Jianlong Li, Ziyin YangAbstract:Insect attacks change the quantity of volatiles emitted from plants, but little is known about the effects on the volatiles' stereochemical configurations. 1-Phenylethanol (1PE) is a major internal volatile of tea (Camellia sinensis) flowers. In the present study, insect-damaged C. sinensis flowers in the field emitted a different (R)-/(S)-1PE pattern than that emitted from undamaged flowers. Laboratory experiments showed that changes in the (R)-/(S)-1PE ratio were caused by treatments with Thrips Hawaiiensis (Morgan), a pest of cut flowers and vegetable crops. These treatments led to an increase in jasmonic acid (JA) through the activation of allene oxide synthase, which is involved in JA biosynthesis. Exposing flowers to exogenous JA induced an (R)-/(S)-1PE emission pattern that was similar to that induced by a T. Hawaiiensis attack, suggesting that JA was involved in the changes in the stereochemical configuration of 1PE emitted from the flowers after insect treatments. This study provides new insights into the involvement of volatiles in interactions between plants and insects, showing that not only the quantity but also the stereochemical configuration of plant volatiles is affected by insects.