Different strategies of acclimation of photosynthesis, electron transport and antioxidative activity in leaves of two cotton species to water deficit
Xiao-Ping Yi A , Ya-Li Zhang A , He-Sheng Yao A , Hong-Hai Luo A , Ling Gou A , Wah Soon Chow B and Wang-Feng Zhang A C
+ Author Affiliations
- Author Affiliations
A The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, 832 003, PR China.
B Division of Plant Sciences, Research School of Biology, College of Medicine, Biology and Environment, The Australian National University, Acton, ACT 2601, Australia.
C Corresponding author. Emails: zhwf_agr@shzu.edu.cn; zwf_shzu@163.com
Functional Plant Biology 43(5) 448-460 https://doi.org/10.1071/FP15247
Submitted: 18 August 2015 Accepted: 19 January 2016 Published: 2 March 2016
Abstract
To better understand the adaptation mechanisms of the photosynthetic apparatus of cotton plants to water deficit conditions, the influence of water deficit on photosynthesis, chlorophyll a fluorescence and the activities of antioxidant systems were determined simultaneously in Gossypium hirsutum L. cv. Xinluzao 45 (upland cotton) and Gossypium barbadense L. cv. Xinhai 21 (pima cotton). Water deficit decreased photosynthesis in both cotton species, but did not decrease chlorophyll content or induce any sustained photoinhibition in either cotton species. Water deficit increased ETR/4 − AG, where ETR/4 estimates the linear photosynthetic electron flux and AG is the gross rate of carbon assimilation. The increase in ETR/4 − AG, which represents an increase in photorespiration and alternative electron fluxes, was particularly pronounced in Xinluzao 45. In Xinluzao 45, water deficit increased the activities of antioxidative enzymes, as well as the contents of reactive oxygen species (ROS), which are related to the Mehler reaction. In contrast, moderate water deficit particularly increased non-photochemical quenching (NPQ) in Xinhai 21. Our results suggest that Xinluzao 45 relied on enhanced electron transport such as photorespiration and the Mehler reaction to dissipate excess light energy under mild and moderate water deficit. Xinhai 21 used enhanced photorespiration for light energy utilisation under mild water deficit but, when subjected to moderate water deficit, possessed a high capacity for dissipating excess light energy via heat dissipation.
Additional keywords: alternative electron transport, heat dissipation, Mehler reaction, photorespiration.
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