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为了探索秋季低温对杂交水稻结实率的影响,我们于1978年在丽水县城关及丽水县峰源公社山区进行了试验观察,并着重进行了抽穗期逐日定穗挂牌考察,现将结果初报于下。一、不同杂交组合对秋季低温敏感性的差异由于不同杂交亲本对低温敏感性的差异,不同杂交组合对低温的反应差异也较大。从丽水城关(海拔61米)对不同杂交组合(汕优8号、珍汕97不育系×早恢1号、珍汕97不育系×科珍145、矮优2号、汕优6号)于抽穗期逐日定穗挂牌考察的结果来看,在正常情况下,组合之间逐日最高结实率在66—82%,差异较大。供试组合中,以汕优6号和矮优2号为最高,分别达82%和81.2%。珍汕97不育系×科珍145最低,仅66%,高低之差达16%。1978年
In order to explore the effect of autumn low temperature on the seed setting rate of hybrid rice, we conducted experimental observations in mountainous areas of Shiguan commune in Chengguan and Lishui, Lishui County in 1978 and focused on the daily panicle identification at heading stage. under. First, the different combinations of low temperature sensitivity to autumn differences Due to the different hybrid parents to the low temperature sensitivity differences, different combinations of response to low temperature differences are also larger. The effects of different hybrid combinations (Shanyou 8, Zhenshan 97 male sterile line × Zaohui 1, Zhenshan 97 male sterile line × Kezhen 145, Dianyou 2, Shanyou 6 ) During the heading date of heading date, the results of the earliest date of earing inspection showed that under normal circumstances, the daily maximum seed setting rate was between 66 and 82%, which was quite different. The combination of testing, with Shanyou 6 and shortyou 2 as the highest, respectively 82% and 81.2%. Zhenshan 97 CMS × Kezhen 145 the lowest, only 66%, the difference between the level of 16%. 1978