Authors : Yao Xiong, Li Jing-Yong, Ren Wan-Jun and Yang Wen-Yu
Abstract: In order to provide scientific theoretical basis for identifying the rice shade-endurance and develop the rice production of china. The effects of 50% shading in different breeding stage on root system, photosynthetic rate, the leaf area index and yield of rice were studied. Results showed that under shading stress, the growth of root system was inhibited, the photosynthetic rate, number of effective panicles, grains per panicle, filled grain per plant, seed setting rate, 1000 grain weight and grain yield decreased meanwhile, the leaf area index and number of sterile per seed increased. The biggest effect was shading in elongating-heading stage and then were shading in filling stage and tillering stage. Six indexes such as root vigor, root volume, root active absorbing area, photosynthetic rate of leaf, seed setting rate and grain yield, etc., could be taken as identification indexes of rice shade-endurance. By using integrated shade-endurance coefficient as evaluating index and rice shade-endurance could be divided into 3 grades. Among these varieties, the shade-endurance of 5 varieties such as Dyou158 and Dyou527, etc., were stronger, the shade-endurance of Gangyou906 and Yifeng8 were weaker.
Yao Xiong, Li Jing-Yong, Ren Wan-Jun and Yang Wen-Yu, 2011. Primary Study on the Identification Method of Rice Shade-Endurance. Research Journal of Agronomy, 5: 32-37.