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Partager le résultat de cette rechercheInteractive salt-Alkali stress and exogenous Ca2+ effects on growth and osmotic adjustment of Lolium multiflorum in a coastal estuary / Youyuan Chen in Flora, vol. 229 (Année 2017)
Titre : Interactive salt-Alkali stress and exogenous Ca2+ effects on growth and osmotic adjustment of Lolium multiflorum in a coastal estuary Type de document : texte imprimé Auteurs : Youyuan Chen, Auteur ; Pengzhan Lu, Auteur ; Ping Sun, Auteur ; Guanglin Chen, Auteur ; Lai Wei, Auteur ; Dan Wu, Auteur Année de publication : 2017 Article en page(s) : pp. 92-99 Langues : Anglais (eng) Résumé : "Salt and pH levels in coastal estuaries are very high. In our study, different degrees of interactive salt − alkali stress were simulated to determine the effects of interactive salt − alkali stress on the growth and osmotic regulation of Lolium multiflorum (group A experiment). In addition, Ca2+ solutions were prepared to examine the mitigative effects of exogenous Ca2+ on interactive salt − alkali stress (group B experiment). In group A, five salinity levels (0‰, 5‰, 10‰, 15‰, 20‰) were set. Each salinity level was further categorized at three pH levels: 7±0.12, 8±0.22, and 9±0.16. In group B, five Ca2+ levels (0, 2, 4, 6, and 8mM) were added to the experiment. Damage of L. multiflorum by interactive salt − alkali stress was more pronounced than by single salt stress. The tolerable range was defined for pH 7 and salinity ≤10‰, and pH 8 and salinity ≤5‰, respectively, when the leaf relative electrical conductivity was not significantly increased, the chlorophyll content and root vigor were not significantly reduced, and the mortality rate of L. multiflorum was low. However, growth was decreased by more than 90% (at pH≥8 and salinity ≥15‰), and osmotic regulation of L. multiflorum was drastically impaired beyond the tolerance range. Under single salt stress, the content of proline, Na+/K+ ratio and Cl− content were lower than that under interactive salt − alkali stress, while the contents of Ca2+ and Mg2+ were higher. The optimum exogenous Ca2+ concentration was 6mM for L. multiflorum. At this concentration, leaf relative electrical conductivity, proline content and Na+/K+ were lowest, and chlorophyll content, root vigor and Mg2+ content were highest. Overall, L. multiflorum could tolerate a certain degree of interactive salt − alkali stress, which can be beneficial for the ecological restoration of coastal waters. " Type de publication : périodique Référence biblio : Chen Y., Lu P., Sun P., Chen G., Wei L., Wu D., 2017 - Interactive salt-Alkali stress and exogenous Ca2+ effects on growth and osmotic adjustment of Lolium multiflorum in a coastal estuary. Flora, 229 : 92-99. DOI : 10.1016/j.flora.2017.02.018 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=66239
in Flora > vol. 229 (Année 2017) . - pp. 92-99[article]Exemplaires(0)
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Titre : A study of floral shape variation in Delphinieae (Ranunculaceae) using geometric morphometrics on herbarium specimens Type de document : texte imprimé Auteurs : Yiyun Chen, Auteur ; Florian Jabbour, Auteur ; Andriy Novikov, Auteur ; Wei Wang, Auteur ; Sylvain Gerber, Auteur Année de publication : 2018 Article en page(s) : pp. 368-376 Langues : Anglais (eng) Mots-clés : Aconitum Delphinium  flower morphology  nectar spur Staphisagria  taxonomie Résumé : "The variation in the shape of flowers, the reproductive structures of angiosperms, is generally investigated in a qualitative way, or using multivariate statistical analyses of distance data (i.e. traditional morphometrics). In this study, we evaluate the application of geometric morphometric methods to flowers of herbarium specimens, a material that is still being massively overlooked as far as these methods are concerned. Flowers of Delphinieae (Ranunculaceae) are synorganized: the spurred and nectariferous dorsal petals are nested within the spur or hood of the dorsal sepal. The study of synorganized structures is challenging, and geometric morphometric-oriented investigation may provide working hypotheses for an evo-devo exploration of such hyperorgan formation. We analyze here the floral shape of Delphinieae using geometric morphometric methods and demonstrate the effectiveness of these methods on dry and compressed flowers. We also show the diagnostic value of the dorsal half of the perianth of the Delphinieae flower, and suggest some trends to help design future studies on the evolutionary development of spur formation and the co-evolution of Delphinieae flowers with their pollinators." Type de publication : périodique Référence biblio : Chen Y., Jabbour F., Novikov A., Wang W., Gerber S., 2018 - A study of floral shape variation in Delphinieae (Ranunculaceae) using geometric morphometrics on herbarium specimens. Botany letters, 165 : 368-376. Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=68143
in Botany letters > vol. 165, n°3-4 (Année 2018) . - pp. 368-376[article]Exemplaires(1)
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