Heterosis Expression of Hybrid Rice in Natural-and Short-Day Length Conditions
Heterosis Expression of Hybrid Rice in Natural-and Short-Day Length Conditions作者机构:State Key Laboratory of Hybrid RiceHunan Hybrid Rice Research Center
出 版 物:《Rice science》 (水稻科学(英文版))
年 卷 期:2015年第22卷第2期
页 面:81-88页
核心收录:
学科分类:0710[理学-生物学] 0831[工学-生物医学工程(可授工学、理学、医学学位)] 08[工学] 09[农学] 0901[农学-作物学] 0802[工学-机械工程] 0836[工学-生物工程] 0902[农学-园艺学] 080201[工学-机械制造及其自动化]
主 题:hybrid rice heterosis photoperiod short-day length
摘 要:Development of hybrid rice is an important strategy to increase yields of irrigated rice in China. Day length is a highly important environmental factor for hybrid rice adaptability, productivity and quality. Heterosis of hybrid rice has been utilized under natural- (long) day length conditions in the middle and lower reaches plain of Yangtze River Valley in China for a long time. However, whether the hybrid rice can show heterosis under short-day length conditions is unknown. In this study, we analyzed plant height, grain number per panicle, and other yield related traits of hybrid rice Liangyoupeijiu (LYP9) and its parents (Pei'ai 64S and 93-11) under natural- and short-day length conditions and compared the respective heterosis. Results showed that earlier heading, reduced plant height, and reduced grain number per panicle were found in these three varieties under short-day length conditions relative to those under natural-day length conditions. In either natural- or short-day length conditions, heterosis of LYP9 was mainly displayed in grain number per panicle and plant height. This study may help in breeding and selectina suitable hybrid rice for different re qions with natural- or short-day length.