干旱地区农业研究Issue(4)：144-151,8.
适度水分胁迫下增硝对不同基因型水稻苗期生长及生理特性的影响
Effect of ratio of nitrate to ammonium on physiological characteristics of rice genotypes at seedling stage under moderate water stress
摘要
Abstract
Rice genotypes including Gangyou 527 ,Yangdao 6 ,Zhonghan 3 and Nongken 57 were grown under dif-ferent water stress conditions and treated with ammonium and nitrate at various ratios to investigate the effects of water stress and nitrogen forms on growth ,nitrogen absorption and physiological characteristics of rice .The results indicated that ,under normal water condition ,moderate decrease in the ratio of ammonium/nitrate (50∶50) could increase nitrate content in the leaves and roots of rice ,while the net photosynthetic rate (Pn) was not affected .However ,when the pro-portion of nitrate N was higher than 50% ,the physiological and metabolic indexes decreased significantly and the growth of rice seedlings was inhibited .Under moderate water stress condition ,the ratio of ammonium/nitrate at 50∶50 was more beneficial to increase Pn of top three leaves ,to promote the accumulation of compatible osmolytes ,to improve the nitro-gen uptake and to boost the growth of rice seedlings ,as compared with that treated with normal water and 100% ammoni-um N ,Moreover ,under moderate water stress condition ,the responses of different rice genotypes to increasing nitrate N differed from each other significantly .In terms of Pn and nitrogen use efficiency ,indica rice was superior to japonica rice;similarly ,hybrid indica rice was superior to inbred indica rice ,and japonica upland rice was better than japonica paddy rice .No difference was observed in drought tolerance within the same rice genotype .关键词
水分胁迫/水稻/铵硝配比/生理Key words
water stress/rice/ammonium/nitrate/physiological分类
农业科技引用本文复制引用
孙园园,孙永健,秦俭,杨志远,陈林,徐徽,马均..适度水分胁迫下增硝对不同基因型水稻苗期生长及生理特性的影响[J].干旱地区农业研究,2013,(4):144-151,8.基金项目
中国气象局西南区域气象中心区域重大项目（2010-7）；国家自然科学基金项目（31101117）；国家“十二五”科技支撑计划项目（2011BAD16B05，2012BAD04B13，2013BAD07B13）；农业部作物生理生态与耕作重点实验室开放课题；四川省教育厅项目（10ZA047）；四川省育种攻关专项 （）
