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Drought-responsive mechanisms in rice genotypes with contrasting drought tolerance during reproductive stage

文献类型: 外文期刊

作者: Ji, Kuixian 1 ; Wang, Yangyang 1 ; Sun, Weining 2 ; Lou, Qiaojun 3 ; Mei, Hanwei 3 ; Shen, Shihua 1 ; Chen, Hui 1 ;

作者机构: 1.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China

2.Chinese Acad Sci, Shanghai Inst Biol Sci, Inst Plant Physiol & Ecol, Shanghai 200032, Peoples R China

3.Shanghai Acad Agr Sci, Shanghai 201106, Peoples R China

4.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

关键词: Rice;Drought;Proteomics;Flag leaf;Reproductive stage

期刊名称:JOURNAL OF PLANT PHYSIOLOGY ( 影响因子:3.549; 五年影响因子:4.164 )

ISSN: 0176-1617

年卷期: 2012 年 169 卷 4 期

页码:

收录情况: SCI

摘要: Water status is the main factor affecting rice production. In order to understand rice strategies in response to drought condition in the field, the drought-responsive mechanisms at the physiological and molecular levels were studied in two rice genotypes with contrasting susceptibility to drought stress at reproductive stage. After 20 d of drought treatment, the osmotic potential of leaves reduced 78% and 8% in drought susceptible rice cultivar Zhenshan97B and tolerant rice cultivar IRAT109, respectively. The panicle lengths had no obvious changes in drought stressed Zhenshan97B and IRAT109, suggesting that drought stress impose less effect on assimilate translocation from leaf to vegetative growth of panicles. IRAT109 showed more extensive deeper root growth that could be considered a second line of defense against drought stress. The C-i/C-a ratio exhibited enhancement over reduction of g(s) in both cultivars, reflecting the non-stomatal limitation to photosynthesis occurred during drought stress. Orthophosphate dikinase, glycine dehydrogenase, ribulose bisphosphate carboxylase (Rubisco), glycine hydroxymethyltransferase and ATP synthase were down-regulated for Zhenshan97B in response to drought stress, suggesting the reduction of capacity of carbon assimilation in this rice cultivar. In drought-stressed IRAT109, transketolase, Rubisco were down-regulated, however, Rubisco activase and peptidyl-prolyl cis-trans isomerase, which might alleviate the damage on Rubisco by drought stress, were up-regulated. The increased abundances of chloroplastic superoxide dismutase [Cu-Zn] and dehydroascorbate reductase might provide antioxidant protection for IRAT109 against damage by dehydration. (C) 2011 Elsevier GmbH. All rights reserved.

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