数字农科院2.0

Photosynthesis and chlorophyll fluorescence response to low sink demand of tubers and roots in Dahlia pinnata source leaves

文献类型： 外文期刊

作者： Li, S. H.;Yan, S. T.;Yan, S. T.;Li, X. D.;Fan, P. G.;Duan, W.;Yan, S. T.;Li, W. D.

作者机构：

关键词： stomatal conductance.;intercellular CO concentration;net photosynthetic rate;transpiration rate;Internet resource.

期刊名称： BIOLOGIA PLANTARUM

ISSN：

年卷期：

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收录情况： SCI

摘要： Photosynthetic rate (PN) and chlorophyll (Chl) fluorescence induction of source leaves in response to a low sink demand created by girdling the branch (GB) between the root-tuber-system and the leaves were studied in Dahlia pinnata L. cv. Rigolet during the stage of rapid tuber growth in the greenhouse. GB resulted in significantly lower values of PN, stomatal conductance (gs), and transpiration rate (E), but in higher leaf temperature (Tl) compared with those of controls. With exception of maximum quantum yield of photosystem 2 (PS 2) photochemistry (Fv/Fm) and maximum ratio of quantum yields of photochemical and concurrent non-photochemical processes in PS 2 (Fv/F), no significant differences were observed in Chl fluorescence parameters between girdled and control leaves on days 1 and 2 after GB, indicating no apparent damage in the photosynthetic apparatus. However, longer girdling duration resulted in higher non-photochemical Chl fluorescence quenching (NPQ), but lower Fv/F, actual efficiency of energy conversion in PS 2 under steady-state conditions (EPS), and photochemical quenching coefficient (qP) in comparison with controls from 10:00 to 16:00 or 15:00 on days 4 and 5, respectively, indicating reversible injury in the photosynthetic apparatus.

分类号： Q94

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