Study On The Response Of Different Rice Varieties To Light And Nitrogen And Its Mechanism

40 early rice and 33 late rice used as material in 2014, using different light and nitrogen treatment to study the variation of yield and through cluster analysis to select the yield stability has significant difference of early rice varieties and late rice varieties. Based on it, through different light and nitrogen treatment to study the plant type and physiological characteristics of different production system stable double cropping rice varieties in 2015.The main results are as follows:Zhongjiazao 17、Zhongzao 39、Ganxin 203 which in early rice and Fengyuanyou 24、Ganxin 600 and Taiyougan No.3 varieties which in late rice has a small change in yield and its yield stability are good;But Lingliangyou 268、Jinyou 463、Yuexin 68 which in early rice and I691、Tianfengyou 101 and Hyou159 which in late rice has a large change in yield and its yield stability are poor.The stability of the remaining rice varieties ranged between these two types of rice.The yield stability of double rice is closely related to the sensitivity to light and nitrogen, stable type early rice is not sensitive to weak light and nitrogen, and not stable type early rice were more sensitive to weak light and nitrogen, The stable and unstable type late rice varieties were sensitive to weak light, but the difference of nitrogen sensitivity is exist.Different types of varieties has difference in the stability and yield components,morphological characteristics, dry matter accumulation, nitrogen accumulation, carbon and nitrogen metabolism enzyme activity. Stable yield of early rice varieties has a lower plant height, blade with vertical angle is relatively smaller, shorter length of upper leaves, with wide width, effective panicle number are less,number of grain per ear is more; Not stable yield of early rice varieties has a higher plant height, blade with vertical angle is larger, leaf length and width is short,effective panicle number are more, number of grain per ear is less.The plant height of stable yield late rice is short, blade with vertical angle is large, leaf length and width wide, effective panicle number are less,number of grain per ear is more;Not stable yield late rice varieties with higher plant height, blade with vertical angle is relatively smaller, leaf length is longer, wider than it is wide, effective panicle number are more, number of grain per ear is less; After low light stress, the stable type of double rice varieties has a small decline range in the dry matter, nitrogen accumulation, carbon metabolism related enzymes peroxidase, catalase, superoxide dismutase increased greatly,the content of MDA increased to a lesser extent, nitrogen metabolism related enzyme nitrate reductase and glutamine synthetase has a small decline range. The not stable type of double rice varieties has a large decline range in the dry matter, nitrogen accumulationand carbon metabolism related enzymes peroxidase, catalase, superoxide dismutase increased to a lesser extent, malondialdehyde(MDA) increased by a big margin, nitrogen metabolism related enzyme nitrate reductase and glutamine synthetase has a large decline range.