Photosynthetica 2016, 54(1):12-18 | DOI: 10.1007/s11099-015-0139-9

Photorespiration and photoinhibition in the bracts of cotton under water stress

C. Zhang1, D. X. Zhan1, H. H. Luo1, Y. L. Zhang1, W. F. Zhang1,*
1 Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Agricultural College, Shihezi University, Shihezi, Xinjiang, China

Gas exchange and chlorophyll fluorescence parameters of PSII were analyzed in the bracts and leaves of cotton plants after anthesis. Photosynthetic activity and photorespiration were measured in the leaves and bracts of cotton grown under either normal or reduced water-saving drip irrigation. The photosynthetic performance, amount of chlorophyll and Rubisco, and net photosynthesis were greater in the bracts than that in the leaves under water stress. The actual photochemical efficiency of PSII decreased in both the bracts and leaves after anthesis under reduced irrigation. However, the decrease was smaller in the bracts than in the leaves, indicating that the bracts experienced less severe photoinhibition compared to the leaves. The greater drought tolerance of bracts could be related to differences in relative water content, instantaneous water-use efficiency, and photorespiration rate. The ratio of photorespiration to net photosynthesis was much higher in the bracts than in leaves. Furthermore, water deficiency (due to the water-saving drip irrigation) had no significant effect on that ratio in the bracts. We hypothesized that photorespiration in the bracts alleviated photoinhibition and maintained photosynthetic activity.

Additional key words: electron flow; Gossypium hirsutum; photoprotection; PSII

Received: June 17, 2014; Accepted: January 22, 2015; Published: March 1, 2016  Show citation

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Zhang, C., Zhan, D.X., Luo, H.H., Zhang, Y.L., & Zhang, W.F. (2016). Photorespiration and photoinhibition in the bracts of cotton under water stress. Photosynthetica, 54(1), 12-18. doi: 10.1007/s11099-015-0139-9
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