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Improvement of heat and drought photosynthetic tolerance in wheat by overaccumulation of glycinebetaine

文献类型： 外文期刊

作者： Wang, Gui-Ping 1 ; Hui, Zhen 1 ; Li, Feng 1 ; Zhao, Mei-Rong 1 ; Zhang, Jin 1 ; Wang, Wei 1 ;

作者机构： 1.Shandong Agr Univ, Coll Life Sci, State Key Lab Crop Sci, Tai An 271018, Shandong, Peoples R China

2.Shandong Inst Pomol, Tai An 271000, Shandong, Peoples R China

关键词： carbon dioxide: 124-38-9;antioxidants;antioxidative enzymes;glycinebetaine: 107-43-7;overaccumulation;Gene Name;Triticum aestivum BADH gene [Gramineae]: Triticum aestivum betaine aldehyde dehydrogenase gene;expr;crop yield;drought tolerance;enzyme activity;stomatal conductance;water deprivation;transpiration rate;osmotic adjustment;photosynthesis rate;heat tolerance;relative water content;antioxidative defense system

期刊名称：PLANT BIOTECHNOLOGY REPORTS （ 影响因子：2.01； 五年影响因子：1.907 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Within their natural habitat, crops are often subjected to drought and heat stress, which suppress crop growth and decrease crop production. Causing overaccumulation of glycinebetaine (GB) has been used to enhance the crop yield under stress. Here, we investigated the response of wheat (Triticum aestivum L.) photosynthesis to drought, heat stress and their combination with a transgenic wheat line (T6) overaccumulating GB and its wild-type (WT) Shi4185. Drought stress (DS) was imposed by controlling irrigation until the relative water content (RWC) of the flag leaves decreased to between 78 and 82%. Heat stress (HS) was applied by exposing wheat plants to 40A degrees C for 4 h. A combination of drought and heat stress was applied by subjecting the drought-stressed plants to a heat stress as above. The results indicated that all stresses decreased photosynthesis, but the combination of drought and heat stress exacerbated the negative effects on photosynthesis more than exposure to drought or heat stress alone. Drought stress decreased the transpiration rate (Tr), stomatal conductance (Gs) and intercellular CO2 concentration (Ci), while heat stress increased all of these; the deprivation of water was greater under drought stress than heat stress, but heat stress decreased the antioxidant enzyme activity to a greater extent. Overaccumulated GB could alleviate the decrease of photosynthesis caused by all stresses tested. These suggest that GB induces an increase of osmotic adjustments for drought tolerance, while its improvement of the antioxidative defense system including antioxidative enzymes and antioxidants may be more important for heat tolerance.

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