Cold-night responses in grapevine inflorescences.
作者： Mélodie Sawicki , Essaid Ait Barka , Christophe Clément , Françoise Gilard , Guillaume Tcherkez
DOI: 10.1016/J.PLANTSCI.2015.07.023
关键词: Respiration 、 Cultivar 、 Invertase 、 Phosphoenolpyruvate carboxylase 、 Photosystem I 、 Biology 、 Photosynthesis 、 Metabolism 、 Carbohydrate metabolism 、 Botany 、 Horticulture
摘要: Cold nights impact grapevine flower development and fruit set. Regulation at the female meiosis stepmay be of considerable importance for further understanding on how reacts to cold stress. In this study, chilling temperature (0 °C overnight) carbon metabolism was investigated in inflorescencesof two cultivars, Pinot noir (Pinot) Gewurztraminer (Gewurtz.). Fluctuations photosynthetic activity carbohydrate were monitored by analyzing gas exchanges, simultaneous photosystem I II activities, andcarbohydrate content. Further, expression PEPc, PC, FNR, ISO, OXO, AGPase, amylases invertase genes, activities various enzymes, as well metabolomic analysis attained. Results showed that night has different impacts depending cultivars. Thus, Gewurtz., net photosynthesis (Pn) transiently increased whereas, Pinot, Pn increase persistent concomitant with an inhibition respiration. However, during days following night, decreased, cyclic electron flow inhibited suggesting lower efficient energy dissipation. Likewise, revealed several metabolites contents (namely alanine, GABA, lysine succinate)were distinctly modulated Taking together, these results reflect a alteration or internal CO2 conductance Gewurtz. explaining partly why is less susceptible
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