Effects of cold-hardening on chilling-induced photoinhibition of photosynthesis and on xanthophyll cycle pigments in sweet pepper

文献类型： 外文期刊

第一作者： Liu, P

作者： Liu, P;Meng, QW;Zou, Q;Zhao, SJ;Liu, QZ

作者机构：

关键词： Acclimation;Antheraxanthin;Capsicum annuum;Chlorophyll fluorescence;Low-temperature photoinhibition;Chlorophyll fluorescence;Growth;temperature;Spinach leaves;Photosystem-ii;Light stress;Zea-mays;Susceptibility;Recovery;Maize

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

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收录情况： SCI

摘要： Two cultivars of Capsicum annuum L. were acclimated for 5 d at sub-optimal temperature (14 C) and irradiance of 250 mumol m(-2) s(-1). This cold-hardening resulted in some reduction in the extent of photoinhibition during an 8 h exposure to high irradiance at 4 degreesC. Obvious differences were observed between non-hardened leaves (NHL) and cold-hardened leaves (CHL) in the recovery under low irradiance at room temperature. The CHL of both cultivars recovered faster than NHL, especially during the initial fast phase of recovery. Compared with NHL, the total content of carotenoids (Cars), based on chlorophyll, Chl (a+b), and the proportions of xanthophyll cycle pigments referred to total Cars increased in CHL, mainly due to an increase of violaxanthin (V) + antheraxanthin (A) + zeaxanthin (Z) content per mol Chl (a+b). Faster development and a higher non-photochemical quenching (NPQ) of Chl fluorescence, related to a stronger deepoxidation of the larger xanthophyll cycle pool in NHL, could act as a major defence mechanism to reduce the formation of reactive oxygen species during severe chilling. This is suggested by higher content of Z or Z+A in photoinhibition as well as by its rapid decline during the initial fast phase of recovery. In contrast to the chilling-sensitive ev. 0004, the chilling-tolerant ev. 1141 did more easily acclimate its photosynthetic apparatus to low temperatures.

分类号： Q94

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