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盆栽试验研究了不同氮源对杂交稻和常规稻的生理效应。结果表明,生育后期追施NO_3~--N比NH_4~+-N更能提高稻叶的叶绿素,可溶性蛋白质和核糖核酸的含量;增加光合磷酸化活力和~(14)CO_2同化速率;提高内源玉米素含量,降低脱落酸的水平。这些效应都是下位叶大于上位叶、杂交稻又比常规稻明显。试验结果还表明,追施NO_3~--N比NH_4~+-N更能提高灌浆谷粒中 ATP 水平,推迟谷粒中 脱落酸出现的高峰期;促进~(14)C-同化物向穗部运输,从而提高结实率。这些效应同样是杂交稻大于常规稻。
Pot experiments were conducted to study the physiological effects of different nitrogen sources on hybrid rice and conventional rice. The results showed that topdressing NO_3 ~ --N and NH_4 ~ + -N increased the contents of chlorophyll, soluble protein and ribonucleic acid, increased photosynthetic phosphorylation activity and ~ (14) CO_2 assimilation rate, Source of zein content, reduce the level of abscisic acid. These effects are lower leaves than the upper leaves, hybrid rice than conventional rice significantly. The results also showed that topdressing NO_3 ~ --N can increase the level of ATP in grain filling, postponed the peak of ABA in grains and promoted the accumulation of ~ (14) C - Ministry of transport, thereby enhancing the rate of seed set. These effects are also hybrid rice is larger than conventional rice.