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《Chinese Journal of Applied and Environmental Biology》 2015-06
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Effects of erect panicle mutant R499 on the microclimate of Indica rice

GE Zhongying;YANG Guotao;ZHANG Jie;YI Jun;FAN Cunliu;GUO Lian'an;HU Yungao;School of Life Science and Engineering, Southwest University of Science and Technology;Rice Research Institute, Sichuan Agricultural University;  
Panicle type is an important part of the plant type in rice, but the application of erec t panicle type is rarely studied in Indica rice. With an aim of providing a theoretical basis for the high yield breeding of Indica rice, this research compared the microclimate characteristics of populations of erect and curved panicle types. The effect of different panicle type on the population microclimate was investigated in curved panicle type ri ce Shu Hui 498 and erect panicle mutant R499 of Indica rice. The results showed a much better microclimate in population of erect panicle mutant R499 than in that of curved panicle type. The panicle bending of R499 was less than 40°. The permeability in the middle and lower part of Shu Hui was greatly different from that of R499. When the environmental wind speed was 4.5 m/s, the middle wind speed in R499 was 44.44% higher than that in Shu Hui 498, and the lower wind speed 27.90% higher. The light intensity of 20-80 cm under the canopy decreased in a much slower velocity in the erect panicle type groups than in the curved panicle type groups. Therefore the light intensity among the middle and lower leaves was much higher in the erect panicle groups than in the curved panicle type groups from 8:00 am to 16:00 pm, ensuring greater light-receiving rate of middle and lower leaves in the erect panicle rice groups. The temperatures in the middle and lower part of erect panicle type groups were higher than that of curved panicle type groups, while the humidity was relatively lower. Since the panicle type was the only difference between the two groups, it could be considered as an important factor that leads to the difference in the microclimate characteristics of the Indica rice populations.
【Fund】: 国家科技支持计划(12zgc007);; 国家政策引导类科技计划及其他专项(12zgc004);; 四川省育种攻关项目;; 四川省生物质资源利用与改性工程技术中心开展开放基金项目;; 四川省岗位专家项目(川农业函[2014]91号);; 杂交水稻国家重点实验室开放基金项目资助~~
【CateGory Index】: S511.21
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