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The Relative Contribution of non-foliar organs of Cotton to Yield and Related Physiological Characteristics Under Water Defi cit

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Journal of Integrative Agriculture 2014年第5期13卷 975-989页

作者： HU Yuan-yuan ZHANG Ya-li YI Xiao-ping ZHAN Dong-xia LUO Hong-hai Chow Wah Soon ZHANG Wang-feng The Key Laboratory of Oasis Eco-Agriculture Xinjiang Production and Construction Group Shihezi University Division of Plant Science Research School of Biology The Australian National University

Water deficit is one of the most important causes of decreased yield in cultivated plants. non-foliar green organs in cotton play an important role in yield formation at the late growth stage. Although better photosynthetic performance was observed in a non-foliar organ （bract） compared with leaves under water deficit. However, the physiological response of each organ in cotton to water deficit has not been comprehensively studied in relation to the water status and photosynthesis characteristics. We studied the maintenance of water status of each organ in cotton by measuring their relative water content, proline content and stomatal characteristics. Water deficit significantly decreased the surface area of each organ, but to a lesser extent in non-foliar organs. Our results showed that the relative contribution of biomass accumulation of non-foliar organs increased under water deficit. non-foliar organs （bracts and capsule wall） showed less ontogenetic decrease in O2 evolution capacity and in RuBPC activity （per dry weight） as well as better antioxidant systems than leaves at various days after anthesis. We conclude that the photosynthesis from non-foliar organs is important for increasing cotton yield especially under water deficit conditions.

关键词： non-foliar organ water deficit water status antioxidant systems biomass accumulation cotton

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