Photosynthetica, 2009 (vol. 47), issue 4

Photosynthetica 2009, 47(4):609-615 | DOI: 10.1007/s11099-009-0087-3

Leaf diaheliotropic movement can improve carbon gain and water use efficiency and not intensify photoinhibition in upland cotton (Gossypium hirsutum L.)

Y. L. Zhang1, H. Z. Zhang1, G. Y. Feng1, J. S. Tian1, W. F. Zhang1,*
1 The Key Laboratory of Oasis Eco-agriculture, Xinjiang Production and Construction Group, Shihezi University, Shihezi, P.R. China

Upland cotton (Gossypium hirsutum L.) can move leaves to track the sun throughout the day, so-called leaf diaheliotropic movement. This paper reports an experimental test of the hypothesis that leaf diaheliotropic movement in upland cotton can enhance carbon assimilation and not increase the risk of stress from high energy load. In this experiment, cotton leaves were divided into two groups: one was that leaves could track the sun freely; another was that leaves were retained to the horizontal position. The diaheliotropic leaves recorded higher incident irradiance than the restrained ones, especially in the morning and late afternoon. Compared with restrained leaves, diaheliotropic leaves were generally warmer throughout the day. As expected, diaheliotropic leaves had significantly higher diurnal time courses of net photosynthetic rate (P N) than restrained leaves, except during 14:00-18:00 of the local time. Higher instantaneous water-use efficiency (WUE) was observed in diaheliotropic leaves in the early morning and late afternoon than in the restrained leaves. During the given day, diaheliotropic and restrained leaves had similar diurnal time courses of recovery of maximal quantum yield of PSII photochemistry (Fv/Fm). Diaheliotropic leaves recorded lower or similar photochemical quenching coefficient (qp) than restrained leaves did throughout the day. These results suggest that cotton leaf diaheliotropic movement can improve carbon gain and water use efficiency and not intensify photoinhibition.

Keywords: carbon assimilation; chlorophyll fluorescence; leaf movement; photoinhibition; water use efficiency

Received: July 16, 2009; Accepted: December 3, 2009; Published: December 1, 2009Show citation

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Zhang, Y.L., Zhang, H.Z., Feng, G.Y., Tian, J.S., & Zhang, W.F. (2009). Leaf diaheliotropic movement can improve carbon gain and water use efficiency and not intensify photoinhibition in upland cotton (Gossypium hirsutum L.). Photosynthetica, 47(4), 609-615. doi: 10.1007/s11099-009-0087-3.
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