Photosynthetica 2001, 39(3):467-472 | DOI: 10.1023/A:1015155032135

Effects of Cold-Hardening on Chilling-Induced Photoinhibition of Photosynthesis and on Xanthophyll Cycle Pigments in Sweet Pepper

Peng Liu1, Qing-wei Meng2, Qi Zou2, Shi-jie Zhao2, Qing-zhong Liu1
1 Shandong Institute of Pomology, Tai'an, Shandong, P.R. China
2 Department of Plant Science, Shandong Agricultural University, Tai'an, Shandong, P.R. China

Two cultivars of Capsicum annuum L. were acclimated for 5 d at sub-optimal temperature (14 °C) and irradiance of 250 µmol 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 °C. 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 cv. 0004, the chilling-tolerant cv. 1141 did more easily acclimate its photosynthetic apparatus to low temperatures.

Additional key words: acclimation; antheraxanthin; Capsicum annuum; chlorophyll fluorescence; neoxanthin; violaxanthin; zeaxanthin

Published: September 1, 2001  Show citation

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Liu, P., Meng, Q., Zou, Q., Zhao, S., & Liu, Q. (2001). Effects of Cold-Hardening on Chilling-Induced Photoinhibition of Photosynthesis and on Xanthophyll Cycle Pigments in Sweet Pepper. Photosynthetica, 39(3), 467-472. doi: 10.1023/A:1015155032135
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