[Response of indica rice in two genic male-sterile lines to temperature and photoperiod].
Investigations on the fertility conversion of two photoperiod- and temperature sensitive genic male-sterile lines Zheda 247S and Peiai 64s under natural conditions in Hangzhou showed that there was a little impact of photoperiod on their fertility expression, while temperature was the main factor. Among daily mean temperature, daily maximum temperature and daily minimum temperature, the last one had the most significant correlation with the fertility. The temperature sensitive stage of Zheda 247S and Peiai 64S was 318 and 621 days before heading, the critical temperature of their fertility conversion was 25.28 and 25.66 degrees C, and the critical date was September 19th and September 25th, respectively. Compared to Peiai 64S, Zheda 247S had a more evident fertility conversion, its sterility was more complete and its self-setting percentage was higher at fertile stage, and the duration of the fertile stage was longer. Zheda 247S could be reproduced in Hangzhou.
Agronomy Department, Zhejiang University, Hangzhou 310029, China.
Xiaorong
X
Chen
Zhentao
Z
Tian
Qingzhong
Q
Xue
D012275:Oryza / Q000254:growth & development*; D017440:Photoperiod; D012098:Reproduction; D013696:Temperature