Effect Of Temperature On Metabolization Of The Element Of Carbon And Nitrogen And Characters Of Early-Indica Rice With Different Usage During Grain Filling Stage

With the continuous increase of the rice output, the supply of rice had exceeded the demand in the past several years in china. Peasants have little interest in cultivating because of the low price of rice. In order to expand the appling domain and heighten the commodity value of rice, the government have dstablished some special projects involved in the projects of the "Ninth Five" and "Tenth Five" to research the productive technology of the edible guality rice and the forage rice with high protein content, and the rice that is suit for rice flour. With the material of the forage rice Xiangzaoxian 24, the flour rice Xiangzaoxian 33 and the edible quality rice Xiangzaoxian 31, which were three different types of early-indica rice mostly planted in Hunan province, this study has researched the effect of temperature on the characters in rice for different usage and the metabolization of the element of carbon and nitrogen. Its purpose is to recognize the physiological traits of the accumulation of hydrocarbon and protein in different varieties, and to offer some theorial guidance in the way of increasing the tice output, improving the quality of rice and developing the most suitable cultivating technology accofding to the different usage.The main experimental results are as follows.1. Effect of temperature on the weight of grainThe weight of take on a continuous increasing trend during grain filling stage. High temperature is unfavorable for the increase of grain weight, which is apparent lower during the cindition of high temperature than that during the proper temperature condition. Different varieties reacted differently to the high temperature and proper temperature. Ripe grain of Xiangzaoxian 33 has 3. 12g/kilo-grain difference between the condition of high and proper temperature, Xiangzaoxian 31 has 3.65g/kilo-grain difference, yet Xiangzaoxian 24 has 4.67 g/kilo-grain difference. So Xiangzaoxian 24 is most sensitive to the high temperature.2. Effect of temperature on the content of soluble sugar in grainThe soluble sugar content in grain take on a decreasing trend during grain filling stage. The soluble sugar content in ripe grain during proper temperature condition is lower than that during high temperature condition. High temperature has the most effect on Xiangzaoxian 24, whose ripe grain' s soluble sugar content has 0. 86% difference between the condition of high and proper temperature, while Xiangzaoxian 31 has 0.78% difference, Xiangzaoxian 33 has 0.70% difference.3. Effect of temperature on the content of starch in grainThe starch content in grain has the same changing trend as the grain weight. High temperature is unfavorable for the increase of starch content, which is apparent lower during the cindition of high temperature than that during the proper temperature condition. High temperature is especially unfavorable for the increase of starch content of Xiangzaoxian 24, whose ripe grain' s starch content has 5.20% difference between the condition of high and proper temperature,whileXiangzaoxian 31 has 2. 86% difference, Xiangzaoxian 33 has 2. 38%difference.4. Effect of temperature on the content of amylose in grainThe AC content in grain take on a increasing trend during grain filling stage. Different varieties reacted differently to the high temperature and proper temperature. Xiangzaoxian 33 and Xiangzaoxian 24' s AC in ripe grain during high temperature condition is higher than that during proper temperature condition, while Xiangzaoxian 31 has the opposite result.The difference among different varieties' AC content comes to appeal at the early grain filling stage. Hardly does Xiangzaoxian 33 show the superiority of high AC when it is 5 days after flowering. What' s more, Xiangzaoxian 33 has the highest AC content among the three different varieties during every grain filling stage.5. Effect of temperature on the activity of FBPase in flag leaf and grainThe activity of FBPase in flag leaf and grain increases first , and then decreases. The activity of FBPase in...