Constitutive accumulation of zeaxanthin in tomato alleviates salt stress-induced photoinhibition and photooxidation

Physiologia Plantarum
Qiu-Yu ZhangQing-Wei Meng

Abstract

Zeaxanthin (Z) has a role in the dissipation of excess excitation energy by participating in non-photochemical quenching (NPQ) and is essential in protecting the chloroplast from photooxidative damage. To investigate the physiological effects and functional mechanism of constitutive accumulation of Z in the tomato at salt stress-induced photoinhibition and photooxidation, antisense-mediated suppression of zeaxanthin epoxidase transgenic plants and the wild-type (WT) tomato were used. The ratio of Z/(V + A + Z) and (Z + 0.5A)/(V + A + Z) in antisense transgenic plants were maintained at a higher level than in WT plants under salt stress, but the value of NPQ in WT and transgenic plants was not significantly different under salt stress. However, the maximal photochemical efficiency of PSII (Fv/Fm) and the net photosynthetic rate (Pn) in transgenic plants decreased more slowly under salt stress. Furthermore, transgenic plants showed lower level of hydrogen peroxide (H(2)O(2)), superoxide anion radical (O(2)(•-)) and ion leakage, lower malondialdehyde content. Compared with WT, the content of D1 protein decreased slightly in transgenic plants under salt stress. Our results suggested that the constitutive accumulation of Z in transg...Continue Reading

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Citations

Mar 16, 2013·Extremophiles : Life Under Extreme Conditions·Shanli MouMeiling An
Feb 22, 2018·Physiologia Plantarum·Amnon CochaviShimon Rachmilevitch
Aug 21, 2020·Plant Signaling & Behavior·Jinlu LiNa Sui
Jun 26, 2020·Frontiers in Plant Science·Wenjing YangNa Sui
Feb 12, 2021·Plant Science : an International Journal of Experimental Plant Biology·Hongxiang ZhengNa Sui
Aug 14, 2020·Ecotoxicology and Environmental Safety·Dehou HaoLin Niu

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