超级杂交早稻陆两优996亲本感温特性研究

[目的]研究和探讨两系超级杂交早稻(Oryza sativa L.)陆两优996亲本陆18S和R996的生育期感温特性,尤其对双亲播种至始穗历期与积温的关系进行研究,有利于合理安排其父母本播差期和早期花期预测与调控。[方法]陆18S分5期(3月26日、4月14日、5月21日、6月7日、6月21日)播种,R996也分5期(3月26日、4月20日、5月27日、6月12日、6月29日)播种,分别记载父母本早季低温和晚季高温两播期播种至抽穗期的日期,观察生育动态,并对亲本生育期各阶段有效积温的稳定性以及有效积温与播始历期进行相关和回归分析。[结果]R996感温级别为Ⅵ级,属于中等感温类型;陆18S感温级别为Ⅶ级,属于强感温类型,双亲的感温特性略有差异。[结论]该研究可为解决陆18S与R996组合制种父母本花期不遇问题提供指导。

Study on the Characteristics of Sensitive to Temperature of Super Hybrid Rice(Oryza sativa L.) Luliangyou 996's Parent

[Objective] The characteristics of sensitive to temperature of super hybrid rice Luliangyou 996's parent,Lu18S and R996,were studied and discussed,especially studied the relationship between the days from sowing to heading and accumulative temperature,making for suitably arranging the sowing date of its parent and predicting and controlling its early flowering date.[Method] Lu18S was sowed at March 26,April 14,May 21,June 7,June 21 resp.and R996 was sowed at March 26,April 20,May 27,June 12,June 29 resp..The days from sowing to heading of Luliangyou 996's parent sowing at early season and low temperature condition and late season and high temperature condition were recorded resp.,and observed their development dynamic state,moreover,the correlation and regression analysis were carried out between accumulative temperature and its stability of Luliangyou 996's parent at each stage of whole growth period and the days from sowing to heading.[Result] The temperature sensitive level of R996 was six,which was classified as medium temperature sensitive variety.The temperature sensitive level of Lu18S was seven,which was classified as strong temperature sensitive variety.The characteristics of sensitive to temperature had some difference between R996 and Lu18S.[Conclusion] The study provides a guidance for solving blooming of flowering at different times of parent when using Lu18s and R996 to produce seeds.