How leaves dissipate diurnal excess energy of photosynthetic apparatus resulted from drought in the field-grown cotton

Ya-Li Zhang; Xiao-Ping Yi; He-Sheng Yao; Hong-Hai Luo; Ling-Gou; Wang-Feng Zhang

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How leaves dissipate diurnal excess energy of photosynthetic apparatus resulted from drought in the field-grown cotton

Ya-Li Zhang,Xiao-Ping Yi,He-Sheng Yao,Hong-Hai Luo,Ling-Gou,Wang-Feng Zhang *

Key Laboratory of Oasis Ecology Agriculture of Xinjiang Production and Construction Groups, College of Agriculture, Shihezi University, Shihezi, Xinjiang 832003

*Correspondence author

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Funding: The Specialized Research Fund for the Doctoral Program of Higher Education （No.Grant No. 20126518120002）, The Shihezi University Funds for Distinguished Young Scientists （No.Grant No.2012ZRKXJQ04)）, The National Natural Science Foundation of China （No.Grant No. 31260295）

Opened online:30 November 2015

Accepted by: none

Citation: Ya-Li Zhang,Xiao-Ping Yi,He-Sheng Yao. How leaves dissipate diurnal excess energy of photosynthetic apparatus resulted from drought in the field-grown cotton[OL]. [30 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4660445

To clarify the diurnal balance between the light energy conversion and theCO2 assimilation capacity under the drought, leaf gas exchange, chlorophyll fluorescence, leaf movement and leaf micro-environment during the day time were examined in the field-grown cotton (Gossypium hirsutum L.) and then we evaluated the partitioning of absorbed light energy and the distribution of photosynthetic electron flow. The results showed that leaf diaheliotropic movement was pronounced in all treatments, the incident PAR light and leaf temperature increased in the morning and decreased in the afternoon and drought significantly increased leaf temperature. The diurnal time course of ΦPSII decreased in the morning and increased in the afternoon, moderate drought was obviously lower than well-watered plants, but the predawn Fv/Fm showed no differences among three treatments. It means that moderate drought stress induced down-regulation of photosynthetic apparatus but not caused permanent damage of PSII. The diurnal time course of ΦNPQ showed a maximum between 14:00 and 16:00 hours, and the value was greatest in the moderate drought stressed plants. The diurnal time courses of the distribution of photosynthetic electron flow showed that the drought-induced decrease in the proportion of electron flux for photosynthetic carbon reduction was mostly compensated by the electron flux for the photorespiratory carbon oxidation and the alternative electron flux driven by Mehler-peroxidase reaction and cyclic electron transport around PSI or nitrate reduction. Therefore, we concluded that (1) active leaf diaheliotropic movement works well under drought can optimize the incident light available for photosynthetic apparatus; (2) cotton uses electron transport flux under mild drought whereas electron transport flux and regulated non-photochemical energy dissipation under moderate drought for excess light energy dissipation; (3) photosynthetic electron transport flux is insensitive to drought because of stronger alternative electron sinks in cotton.

Keywords:drought stress; excess energy; cotton.; leaf diaheliotropic movement; photoprotection.

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