The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Jinming Chen - One of the best experts on this subject based on the ideXlab platform.
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molecular phylogeography of four endemic Sagittaria species alismataceae in the sino japanese floristic region of east asia
Botanical Journal of the Linnean Society, 2016Co-Authors: Yiying Liao, Andrew W Gichira, Qingfeng Wang, Jinming ChenAbstract:To reveal the role of climate oscillations of the Quaternary in forming the contemporary plant diversity in the temperate Sino-Japanese Floristic Region of mainland China, we assess the phylogeographical patterns of four Sagittaria species in the region using sequence data from plastid DNA non-coding regions (psbA-trnH, the rpl16 intron and trnC-ycf6) and the internal transcribed spacers of nuclear ribosomal DNA (nrITS). Based on both datasets, the divergence time among the four studied species was estimated to fall in the Late Tertiary (plastid DNA: 7.1–13.7 Mya; ITS: 11.1–16.1 Mya). The ancestral distribution analyses revealed that regions with a great diversity in topography, climate and ecological conditions, e.g. the Hengduan Mountains, Central China and East China, were the areas where the endemics originated. Mismatch distribution analyses revealed that each species had experienced a range expansion in response to Quaternary climatic oscillations. Our findings contradict the hypothesis of Quaternary origins of the endemic Sagittaria spp.; we support the view that modern species in the Northern Hemisphere originated mostly during the Tertiary. Range expansion may have profoundly modified the current distribution ranges of Sagittaria species in the Sino-Japanese Floristic Region. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 00, 000–000.
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Molecular phylogeography of four endemic Sagittaria species (Alismataceae) in the Sino‐Japanese Floristic Region of East Asia
Botanical Journal of the Linnean Society, 2015Co-Authors: Yiying Liao, Andrew W Gichira, Qingfeng Wang, Jinming ChenAbstract:To reveal the role of climate oscillations of the Quaternary in forming the contemporary plant diversity in the temperate Sino-Japanese Floristic Region of mainland China, we assess the phylogeographical patterns of four Sagittaria species in the region using sequence data from plastid DNA non-coding regions (psbA-trnH, the rpl16 intron and trnC-ycf6) and the internal transcribed spacers of nuclear ribosomal DNA (nrITS). Based on both datasets, the divergence time among the four studied species was estimated to fall in the Late Tertiary (plastid DNA: 7.1–13.7 Mya; ITS: 11.1–16.1 Mya). The ancestral distribution analyses revealed that regions with a great diversity in topography, climate and ecological conditions, e.g. the Hengduan Mountains, Central China and East China, were the areas where the endemics originated. Mismatch distribution analyses revealed that each species had experienced a range expansion in response to Quaternary climatic oscillations. Our findings contradict the hypothesis of Quaternary origins of the endemic Sagittaria spp.; we support the view that modern species in the Northern Hemisphere originated mostly during the Tertiary. Range expansion may have profoundly modified the current distribution ranges of Sagittaria species in the Sino-Japanese Floristic Region. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 00, 000–000.
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size dependent sex allocation in a monoecious species Sagittaria pygmaea alismataceae
Annales Botanici Fennici, 2009Co-Authors: Jinming Chen, Qingfeng WangAbstract:Sagittaria species have been reported to display remarkable variation in gender expression. Here, we investigated gender variation in Sagittaria pygmaea, the smallest sized monoecious species in the genus. We used the midvein length as an indicator of plant size and production of male and female flowers as an indicator of gender variation in a single inflorescence. We counted the total number of inflorescences to assess the effect of inflorescence variation on the gender variation pattern. Our results showed that variation in inflorescence number did not affect gender variation. Male flower production increased with increasing plant size, but female flower production did not. Plants of S. pygmaea might enhance their paternal reproductive success by increasing the number of male flowers with increasing plant size.
Haihui Zhang - One of the best experts on this subject based on the ideXlab platform.
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antioxidant activities of Sagittaria sagittifolia l polysaccharides with subcritical water extraction
International Journal of Biological Macromolecules, 2019Co-Authors: Jixian Zhang, Meng Chen, Jinyan Gu, Jie Zhou, Yuqing Duan, Haihui ZhangAbstract:Abstract In the present study, orthogonal experiment (L9 (3)4) was used to optimize the extraction process of Sagittaria sagittifolia L. polysaccharides (SSP) with subcritical water, and the antioxidant activities of polysaccharides were also investigated. The results showed that the optimum extraction conditions were obtained when pH, extraction temperature, extraction time, and liquid to solid ratio were 7, 170 °C, 16 min and 30:1 (mL/g), respectively. In addition, DPPH/ABTS radical scavenging rate and Fe3+ reducing power of polysaccharides exhibited a certain dose-effect relationship. Furthermore, both yield and antioxidant activities of polysaccharides with subcritical water extraction (SWE) were higher than traditional hot water extraction (HWE). The above results showed that SWE was an effective technique to extract and separate polysaccharides from Sagittaria sagittifolia L., which may be potentially applied in the related polysaccharides extraction.
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structural characterization and immunostimulatory activity of a novel polysaccharide isolated with subcritical water from Sagittaria sagittifolia l
International Journal of Biological Macromolecules, 2019Co-Authors: Jixian Zhang, Meng Chen, Jinyan Gu, Jie Zhou, Yuqing Duan, Haihui ZhangAbstract:Abstract In the present study, we obtained polysaccharides from Sagittaria sagittifolia L. (SSP) with subcritical water extraction (SWE). Two water-soluble polysaccharides (SSP-W1 and SSP-S1) from the acquired SSP were isolated with DEAE-52 and Sephadex G-100. Besides, the structural characteristics and immunostimulatory activity were also investigated. The results showed that both SSP-W1 and SSP-S1 were homogeneous polysaccharides and the molecular weight was 62.03 KDa and 15.2 KDa, respectively. In addition, both SSP-W1 and SSP-S1 are heteropolysaccharides. Moreover, FT-IR analysis showed that SSP-W1 was α-pyranose polysaccharide, while SSP-S1 was a typical β-pyranose polysaccharide. Congo red staining showed that there was no triple helix structure in both SSP-W1 and SSP-S1. Furthermore, both SSP-W1 and SSP-S1 could promote the proliferation, production of NO, and secretion of TNF-α and IL-10 of macrophages RAW 264.7, significantly. Therefore, the polysaccharides extracted from Sagittaria sagittifolia L. with SWE have the potential to be used as immunoreactive agent in medicine and functional foods.
Uwe Braun - One of the best experts on this subject based on the ideXlab platform.
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brazilian mycobiota of the aquatic weed Sagittaria montevidensis
Mycologia, 2009Co-Authors: D. J. Soares, Robert W Barreto, Uwe BraunAbstract:Nine species of fungi on the aquatic weed Sagittaria montevidensis (arrowhead) in southern and southeastern Brazil were collected, identified, described and illustrated in a survey for possible biological control agents against this weed. Seven of them are anamorphic fungi, Alternaria alternata, Botrytis cinerea, Cercospora apii, Cercospora Sagittariae, Colletotrichum gloeosporioides, Plectosporium alismatis and Pseudocercospora arthrospora, and two smut fungi, Doassansiopsis deformans and Narasimhania alismatis. All represent new host records or new geographic localities for occurrences of the fungi. Pseudocercospora arthrospora is new to science. It differs from known species of genus Pseudocercospora mainly by its subhyaline and disarticulating conidia and host. This fungus is close to Thedgonia but can be distinguished for this genus by its conidiogenesis. Based on the description and disease symptoms Cylindrocarpon Sagittariae, recorded on S. trifolia from Japan, is regarded here as a later synonym o...
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brazilian mycobiota of the aquatic weed Sagittaria montevidensis
Mycologia, 2009Co-Authors: D. J. Soares, Robert W Barreto, Uwe BraunAbstract:: Nine species of fungi on the aquatic weed Sagittaria montevidensis (arrowhead) in southern and southeastern Brazil were collected, identified, described and illustrated in a survey for possible biological control agents against this weed. Seven of them are anamorphic fungi, Alternaria alternata, Botrytis cinerea, Cercospora apii, Cercospora Sagittariae, Colletotrichum gloeosporioides, Plectosporium alismatis and Pseudocercospora arthrospora, and two smut fungi, Doassansiopsis deformans and Narasimhania alismatis. All represent new host records or new geographic localities for occurrences of the fungi. Pseudocercospora arthrospora is new to science. It differs from known species of genus Pseudocercospora mainly by its subhyaline and disarticulating conidia and host. This fungus is close to Thedgonia but can be distinguished for this genus by its conidiogenesis. Based on the description and disease symptoms Cylindrocarpon Sagittariae, recorded on S. trifolia from Japan, is regarded here as a later synonym of Plectosporium alismatis. Preliminary observations of the fungi in the field and in culture suggest that four of these have potential for use as biocontrol agents against S. montevidensis, namely C. Sagittariae, C. gloeosporioides, P. alismatis and P. arthrospora.
Yiying Liao - One of the best experts on this subject based on the ideXlab platform.
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molecular phylogeography of four endemic Sagittaria species alismataceae in the sino japanese floristic region of east asia
Botanical Journal of the Linnean Society, 2016Co-Authors: Yiying Liao, Andrew W Gichira, Qingfeng Wang, Jinming ChenAbstract:To reveal the role of climate oscillations of the Quaternary in forming the contemporary plant diversity in the temperate Sino-Japanese Floristic Region of mainland China, we assess the phylogeographical patterns of four Sagittaria species in the region using sequence data from plastid DNA non-coding regions (psbA-trnH, the rpl16 intron and trnC-ycf6) and the internal transcribed spacers of nuclear ribosomal DNA (nrITS). Based on both datasets, the divergence time among the four studied species was estimated to fall in the Late Tertiary (plastid DNA: 7.1–13.7 Mya; ITS: 11.1–16.1 Mya). The ancestral distribution analyses revealed that regions with a great diversity in topography, climate and ecological conditions, e.g. the Hengduan Mountains, Central China and East China, were the areas where the endemics originated. Mismatch distribution analyses revealed that each species had experienced a range expansion in response to Quaternary climatic oscillations. Our findings contradict the hypothesis of Quaternary origins of the endemic Sagittaria spp.; we support the view that modern species in the Northern Hemisphere originated mostly during the Tertiary. Range expansion may have profoundly modified the current distribution ranges of Sagittaria species in the Sino-Japanese Floristic Region. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 00, 000–000.
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Molecular phylogeography of four endemic Sagittaria species (Alismataceae) in the Sino‐Japanese Floristic Region of East Asia
Botanical Journal of the Linnean Society, 2015Co-Authors: Yiying Liao, Andrew W Gichira, Qingfeng Wang, Jinming ChenAbstract:To reveal the role of climate oscillations of the Quaternary in forming the contemporary plant diversity in the temperate Sino-Japanese Floristic Region of mainland China, we assess the phylogeographical patterns of four Sagittaria species in the region using sequence data from plastid DNA non-coding regions (psbA-trnH, the rpl16 intron and trnC-ycf6) and the internal transcribed spacers of nuclear ribosomal DNA (nrITS). Based on both datasets, the divergence time among the four studied species was estimated to fall in the Late Tertiary (plastid DNA: 7.1–13.7 Mya; ITS: 11.1–16.1 Mya). The ancestral distribution analyses revealed that regions with a great diversity in topography, climate and ecological conditions, e.g. the Hengduan Mountains, Central China and East China, were the areas where the endemics originated. Mismatch distribution analyses revealed that each species had experienced a range expansion in response to Quaternary climatic oscillations. Our findings contradict the hypothesis of Quaternary origins of the endemic Sagittaria spp.; we support the view that modern species in the Northern Hemisphere originated mostly during the Tertiary. Range expansion may have profoundly modified the current distribution ranges of Sagittaria species in the Sino-Japanese Floristic Region. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 00, 000–000.
Jixian Zhang - One of the best experts on this subject based on the ideXlab platform.
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antioxidant activities of Sagittaria sagittifolia l polysaccharides with subcritical water extraction
International Journal of Biological Macromolecules, 2019Co-Authors: Jixian Zhang, Meng Chen, Jinyan Gu, Jie Zhou, Yuqing Duan, Haihui ZhangAbstract:Abstract In the present study, orthogonal experiment (L9 (3)4) was used to optimize the extraction process of Sagittaria sagittifolia L. polysaccharides (SSP) with subcritical water, and the antioxidant activities of polysaccharides were also investigated. The results showed that the optimum extraction conditions were obtained when pH, extraction temperature, extraction time, and liquid to solid ratio were 7, 170 °C, 16 min and 30:1 (mL/g), respectively. In addition, DPPH/ABTS radical scavenging rate and Fe3+ reducing power of polysaccharides exhibited a certain dose-effect relationship. Furthermore, both yield and antioxidant activities of polysaccharides with subcritical water extraction (SWE) were higher than traditional hot water extraction (HWE). The above results showed that SWE was an effective technique to extract and separate polysaccharides from Sagittaria sagittifolia L., which may be potentially applied in the related polysaccharides extraction.
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structural characterization and immunostimulatory activity of a novel polysaccharide isolated with subcritical water from Sagittaria sagittifolia l
International Journal of Biological Macromolecules, 2019Co-Authors: Jixian Zhang, Meng Chen, Jinyan Gu, Jie Zhou, Yuqing Duan, Haihui ZhangAbstract:Abstract In the present study, we obtained polysaccharides from Sagittaria sagittifolia L. (SSP) with subcritical water extraction (SWE). Two water-soluble polysaccharides (SSP-W1 and SSP-S1) from the acquired SSP were isolated with DEAE-52 and Sephadex G-100. Besides, the structural characteristics and immunostimulatory activity were also investigated. The results showed that both SSP-W1 and SSP-S1 were homogeneous polysaccharides and the molecular weight was 62.03 KDa and 15.2 KDa, respectively. In addition, both SSP-W1 and SSP-S1 are heteropolysaccharides. Moreover, FT-IR analysis showed that SSP-W1 was α-pyranose polysaccharide, while SSP-S1 was a typical β-pyranose polysaccharide. Congo red staining showed that there was no triple helix structure in both SSP-W1 and SSP-S1. Furthermore, both SSP-W1 and SSP-S1 could promote the proliferation, production of NO, and secretion of TNF-α and IL-10 of macrophages RAW 264.7, significantly. Therefore, the polysaccharides extracted from Sagittaria sagittifolia L. with SWE have the potential to be used as immunoreactive agent in medicine and functional foods.
