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首页> 中文期刊> 《农业科学学报（英文版）》 >Combining gas exchange and chlorophylla lfuorescence measurements to analyze the photosynthetic activity of drip-irrigated cotton under different soil water deifcits

Combining gas exchange and chlorophylla lfuorescence measurements to analyze the photosynthetic activity of drip-irrigated cotton under different soil water deifcits

         
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摘要

Gas exchange and chlorophyla lfuorescence were measured to study the effects of soil water deifcit (75, 60 and 45% of ifeld capacity, FC) on the photosynthetic activity of drip-irrigated cotton under ifeld conditions. At light intensities above 1200 µmol m−2 s−1, leaf net photosynthetic rate (Pn) at 60 and 45% FC was 0.75 and 0.45 times respectively than that of 75% FC. The chlorophyl content, leaf water potential and yield decreased as soil water deifcit decreased. Fiber length was signiifcantly lower at 45% FC than at 75% FC. The actual quantum yield of the photosystem II (PSII) primary photo-chemistry and the photochemical quenching were signiifcantly greater at 60% FC than at 75% FC. The electron transport rate and non-photochemical quenching at 45% FC were 0.91 and 1.29 times than those at 75% FC, respectively. The amplitudes of the K- and L-bands were higher at 45% FC than at 60% FC. As soil water content decreased, active PSII reaction centers per chlorophyl decreased, functional PSII antenna size increased, and energetic connectivity between PSII units decreased. Electron lfow from plastoquinol to the PSI end electron acceptors was signiifcantly lower at 45% FC than at 75% FC. Similar to the effect on leafPn, water deifcit reduced the performance index (PIABS, total) in the dark-adapted state. These results suggest that (i) the effect of mild water deifcit on photosystem activity was mainly related to processes between plastoquinol and the PSI end electron acceptors, (i) PSI end electron acceptors were only affected at moderate water deifcit, and (ii) PIABS, total can reliably indicate the effect of water deifcit on the energy supply for cotton metabolism.

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  • 来源
    《农业科学学报（英文版）》 |2016年第6期|1256-1266|共11页
  • 作者

    LUO Hong-hai; Tsimilli-michael Merope; ZHANG Ya-li; ZHANG Wang-feng;

  • 作者单位

    Key Laboratory of 0asis Ecology Agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, P.R.China;

    Bioenergetics Laboratory, University of Geneva, Jussy-Geneva CH-1254, Switzerland;

    Key Laboratory of 0asis Ecology Agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, P.R.China;

    Key Laboratory of 0asis Ecology Agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi 832003, P.R.China;

  • 原文格式 PDF
  • 正文语种 eng
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