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Yiannis Manetas - One of the best experts on this subject based on the ideXlab platform.
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ultraviolet b radiation absorbing capacity of leaf hairs
Physiologia Plantarum, 1992Co-Authors: George Karabourniotis, Kostas Papadopoulos, Maria Papamarkou, Yiannis ManetasAbstract:Pubescence layers with their native structure and orientation were isolated from the leaves of Olea europaea L. and Olea chrysophylla L. They were almost transparent in the visible, but considerable absorptance was evident in the ultraviolet-B region (UV-B), with maximum at 310 nm. Methanolic extracts of hairs from Olea and a variety of other pubescent species consistently showed the existence of UV-screening pigments. Absorptance of trichomes varied, but a trend towards more effective UV-B radiation attenuation in the sub-alpine Verbascum species may be claimed. In all cases, pigments were located within hair cells and in Olea they were characterized as phenolics with considerable flavonoid contribution. It is suggested that leaf hairs, besides other functions, may constitute a shield against UV-B radiation.
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Ultraviolet‐B radiation absorbing capacity of leaf hairs
Physiologia Plantarum, 1992Co-Authors: George Karabourniotis, Kostas Papadopoulos, Maria Papamarkou, Yiannis ManetasAbstract:Pubescence layers with their native structure and orientation were isolated from the leaves of Olea europaea L. and Olea chrysophylla L. They were almost transparent in the visible, but considerable absorptance was evident in the ultraviolet-B region (UV-B), with maximum at 310 nm. Methanolic extracts of hairs from Olea and a variety of other pubescent species consistently showed the existence of UV-screening pigments. Absorptance of trichomes varied, but a trend towards more effective UV-B radiation attenuation in the sub-alpine Verbascum species may be claimed. In all cases, pigments were located within hair cells and in Olea they were characterized as phenolics with considerable flavonoid contribution. It is suggested that leaf hairs, besides other functions, may constitute a shield against UV-B radiation.
Jay M. Shockey - One of the best experts on this subject based on the ideXlab platform.
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Identification, classification and differential expression of Oleosin genes in Tung Tree (Vernicia fordii). PLoS One
2016Co-Authors: Heping Cao, Lin Zhang, Xiaofeng Tan, Hongxu Long, Jay M. ShockeyAbstract:Triacylglycerols (TAG) are the major molecules of energy storage in eukaryotes. TAG are packed in subcellular structures called oil bodies or lipid droplets. Oleosins (OLE) are the major proteins in plant oil bodies. Multiple isoforms of OLE are present in plants such as tung tree (Vernicia fordii), whose seeds are rich in novel TAG with a wide range of industrial applications. The objectives of this study were to identify OLE genes, classify OLE proteins and analyze OLE gene expression in tung trees. We identified five tung tree OLE genes coding for small hydrophobic proteins. Genome-wide phylogenetic analysis and multiple sequence alignment demonstrated that the five tung OLE genes represented the five OLE subfamilies and all contained the ‘‘proline knot’ ’ motif (PX5SPX3P) shared among 65 OLE from 19 tree species, including the sequenced genomes of Prunus persica (peach), Populus trichocarpa (poplar), Ricinus communis (castor bean), Theobroma cacao (cacao) and Vitis vinifera (grapevine). Tung OLE1, OLE2 and OLE3 belong to the S type and OLE4 and OLE5 belong to the SM type of Arabidopsis OLE. TaqMan and SYBR Green qPCR methods were used to study the differential expression of OLE genes in tung tree tissues. Expression results demonstrated that 1) All five OLE genes were expressed in developing tung seeds, leaves and flowers; 2) OLE mRNA levels were much higher in seeds than leaves or flowers; 3) OLE1, OLE2 and OLE3 genes were expressed in tung seeds at much higher levels than OLE4 and OLE5 genes; 4) OLE mRNA levels rapidly increased during seed development; and 5) OLE gene expression was well-coordinated with tung oil accumulation in the seeds. Thes
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identification classification and differential expression of oleosin genes in tung tree vernicia fordii
PLOS ONE, 2014Co-Authors: Heping Cao, Lin Zhang, Xiaofeng Tan, Hongxu Long, Jay M. ShockeyAbstract:Triacylglycerols (TAG) are the major molecules of energy storage in eukaryotes. TAG are packed in subcellular structures called oil bodies or lipid droplets. Oleosins (OLE) are the major proteins in plant oil bodies. Multiple isoforms of OLE are present in plants such as tung tree (Vernicia fordii), whose seeds are rich in novel TAG with a wide range of industrial applications. The objectives of this study were to identify OLE genes, classify OLE proteins and analyze OLE gene expression in tung trees. We identified five tung tree OLE genes coding for small hydrophobic proteins. Genome-wide phylogenetic analysis and multiple sequence alignment demonstrated that the five tung OLE genes represented the five OLE subfamilies and all contained the “proline knot” motif (PX5SPX3P) shared among 65 OLE from 19 tree species, including the sequenced genomes of Prunus persica (peach), Populus trichocarpa (poplar), Ricinus communis (castor bean), Theobroma cacao (cacao) and Vitis vinifera (grapevine). Tung OLE1, OLE2 and OLE3 belong to the S type and OLE4 and OLE5 belong to the SM type of Arabidopsis OLE. TaqMan and SYBR Green qPCR methods were used to study the differential expression of OLE genes in tung tree tissues. Expression results demonstrated that 1) All five OLE genes were expressed in developing tung seeds, leaves and flowers; 2) OLE mRNA levels were much higher in seeds than leaves or flowers; 3) OLE1, OLE2 and OLE3 genes were expressed in tung seeds at much higher levels than OLE4 and OLE5 genes; 4) OLE mRNA levels rapidly increased during seed development; and 5) OLE gene expression was well-coordinated with tung oil accumulation in the seeds. These results suggest that tung OLE genes 1–3 probably play major roles in tung oil accumulation and/or oil body development. Therefore, they might be preferred targets for tung oil engineering in transgenic plants.
George Karabourniotis - One of the best experts on this subject based on the ideXlab platform.
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ultraviolet b radiation absorbing capacity of leaf hairs
Physiologia Plantarum, 1992Co-Authors: George Karabourniotis, Kostas Papadopoulos, Maria Papamarkou, Yiannis ManetasAbstract:Pubescence layers with their native structure and orientation were isolated from the leaves of Olea europaea L. and Olea chrysophylla L. They were almost transparent in the visible, but considerable absorptance was evident in the ultraviolet-B region (UV-B), with maximum at 310 nm. Methanolic extracts of hairs from Olea and a variety of other pubescent species consistently showed the existence of UV-screening pigments. Absorptance of trichomes varied, but a trend towards more effective UV-B radiation attenuation in the sub-alpine Verbascum species may be claimed. In all cases, pigments were located within hair cells and in Olea they were characterized as phenolics with considerable flavonoid contribution. It is suggested that leaf hairs, besides other functions, may constitute a shield against UV-B radiation.
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Ultraviolet‐B radiation absorbing capacity of leaf hairs
Physiologia Plantarum, 1992Co-Authors: George Karabourniotis, Kostas Papadopoulos, Maria Papamarkou, Yiannis ManetasAbstract:Pubescence layers with their native structure and orientation were isolated from the leaves of Olea europaea L. and Olea chrysophylla L. They were almost transparent in the visible, but considerable absorptance was evident in the ultraviolet-B region (UV-B), with maximum at 310 nm. Methanolic extracts of hairs from Olea and a variety of other pubescent species consistently showed the existence of UV-screening pigments. Absorptance of trichomes varied, but a trend towards more effective UV-B radiation attenuation in the sub-alpine Verbascum species may be claimed. In all cases, pigments were located within hair cells and in Olea they were characterized as phenolics with considerable flavonoid contribution. It is suggested that leaf hairs, besides other functions, may constitute a shield against UV-B radiation.
Pedro Martins Da Silva - One of the best experts on this subject based on the ideXlab platform.
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landscape composition and configuration affect the abundance of the olive moth prays Oleae bernard in olive groves
Agriculture Ecosystems & Environment, 2020Co-Authors: María Villa, Alberto Ferreira, Pedro Martins Da Silva, Isabel Patanita, Susana Navalpotro Pascual, Marta Ortega, Sonia A P Santos, José Paulo Sousa, Jose Alberto PereiraAbstract:Abstract Landscape and crop management are important concepts for conservation biological control as they can influence the abundance of natural enemies. In this work we accomplished a multi-scale study focused on the effect of landscape structure and crop management on the olive moth, Prays Oleae (Bernard), an important pest of the olive tree (Olea europaea L.). The olive moth was collected in different olive groves managed under organic farming and integrated production and surrounded by different landscape structures. Generalized additive mixed models were used to analyze the response of the pest to (i) landscape composition and configuration indices, (ii) the management system and (iii) pesticides applications at different scales. Results indicated that the landscape composition, through the effect of the Simpson’s diversity index, negatively influenced P. Oleae abundance and that the effect was evident at larger scales. Also, the landscape configuration negatively affected P. Oleae at larger scales. However, neither the crop management system nor the pesticide applications affected P. Oleae abundance. This study emphasizes that the preservation or implementation of diverse and complex landscapes can contribute to maintain lower population levels of P. Oleae when compared with homogenous landscape areas.
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Landscape composition and configuration affect the abundance of the olive moth (Prays Oleae, Bernard) in olive groves
'Elsevier BV', 2020Co-Authors: Villa Maria, Pedro Martins Da Silva, Santos, Sónia A.p., Sousa, José Paulo, Ferreira Alberto, Patanita Isabel, Ortega Marta, Pascual Susana, Pereira J.a.Abstract:Landscape and crop management are important concepts for conservation biological control as they can influence the abundance of natural enemies. In this work we accomplished a multi-scale study focused on the effect of landscape structure and crop management on the olive moth, Prays Oleae (Bernard), an important pest of the olive tree (Olea europaea L.). The olive moth was collected in different olive groves managed under organic farming and integrated production and surrounded by different landscape structures. Generalized additive mixed models were used to analyze the response of the pest to (i) landscape composition and configuration indices, (ii) the management system and (iii) pesticides applications at different scales. Results indicated that the landscape composition, through the effect of the Simpson’s diversity index, negatively influenced P. Oleae abundance and that the effect was evident at larger scales. Also, the landscape configuration negatively affected P. Oleae at larger scales. However, neither the crop management system nor the pesticide applications affected P. Oleae abundance. This study emphasizes that the preservation or implementation of diverse and complex landscapes can contribute to maintain lower population levels of P. Oleae when compared with homogenous landscape areas.The authors are grateful to the Portuguese Foundation of Science and Technology (FCT, Portugal) for financial support through the projects EXCL/AGR-PRO/0591/2012 “Olive crop protection in sustainable production under global climatic changes: linking ecological infrastructures to ecosystem functions” and PTDC/ASP-PLA/30003/ 2017 – “OLIVESIM - Managing ecosystem services in olive groves using advanced landscape agent-based models” and CIMO (UIDB/00690/ 2020). María Villa also thanks to Portuguese Foundation of Science and Technology for the Postdoctoral fellowship SFRH/BPD/119487/2016. The authors would like to thank to the farmers for allowing the access to their olive groves.info:eu-repo/semantics/publishedVersio
Jose Alberto Pereira - One of the best experts on this subject based on the ideXlab platform.
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landscape composition and configuration affect the abundance of the olive moth prays Oleae bernard in olive groves
Agriculture Ecosystems & Environment, 2020Co-Authors: María Villa, Alberto Ferreira, Pedro Martins Da Silva, Isabel Patanita, Susana Navalpotro Pascual, Marta Ortega, Sonia A P Santos, José Paulo Sousa, Jose Alberto PereiraAbstract:Abstract Landscape and crop management are important concepts for conservation biological control as they can influence the abundance of natural enemies. In this work we accomplished a multi-scale study focused on the effect of landscape structure and crop management on the olive moth, Prays Oleae (Bernard), an important pest of the olive tree (Olea europaea L.). The olive moth was collected in different olive groves managed under organic farming and integrated production and surrounded by different landscape structures. Generalized additive mixed models were used to analyze the response of the pest to (i) landscape composition and configuration indices, (ii) the management system and (iii) pesticides applications at different scales. Results indicated that the landscape composition, through the effect of the Simpson’s diversity index, negatively influenced P. Oleae abundance and that the effect was evident at larger scales. Also, the landscape configuration negatively affected P. Oleae at larger scales. However, neither the crop management system nor the pesticide applications affected P. Oleae abundance. This study emphasizes that the preservation or implementation of diverse and complex landscapes can contribute to maintain lower population levels of P. Oleae when compared with homogenous landscape areas.
