| Effect of ratio of nitrate to ammonium on physiological characteristics of rice genotypes at seedling stage under moderate water stress |
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| DOI：10.7606/j.issn.1000-7601.2013.04.027 |
| Key Words: water stress rice ammonium/nitrate physiological |
| Author Name | Affiliation | | SUN Yuan-yuan1,2, SUN Yong-jian2,3, QIN Jian2,3, YANG Zhi-yuan2,3, CHEN Lin4, XU Hui2,3, MA Jun2,3 | (1.中国气象局成都高原气象研究所, 四川 成都 610072
2.四川农业大学水稻研究所, 四川 温江 611130
3.农业部西南作物生理、生态与耕作重点实验室, 四川 温江 611130
4.温江区气象局, 四川 温江 611130) |
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| Abstract: |
| Rice genotypes including Gangyou 527, Yangdao 6, Zhonghan 3 and Nongken 57 were grown under different 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 proportion 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 nitrogen uptake and to boost the growth of rice seedlings, as compared with that treated with normal water and 100% ammonium 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. |
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