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

被引:39
作者
Liu, P
Meng, QW
Zou, Q [1 ]
Zhao, SJ
Liu, QZ
机构
[1] Shandong Inst Pomol, Shandong 271000, Peoples R China
[2] Shandong Agr Univ, Dept Plant Sci, Shandong 271018, Peoples R China
关键词
acclimation; antheraxanthin; Capsicum annuum; chlorophyll fluorescence; neoxanthin; violaxanthin; zeaxanthin;
D O I
10.1023/A:1015155032135
中图分类号
Q94 [植物学];
学科分类号
071001 ;
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.
引用
收藏
页码:467 / 472
页数:6
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