Heat Resistance of Rice Landrace D43 at Anthesis  

地方稻资源D43的开花期耐热特性研究（英文）

作　　者：LI Xiao-xiang YAO Yi PAN Xiao-wu LI Yong-chao LIU Wen-qiang LIU Li-cheng SHENG Xin-nian KANG Xu-mei DUAN Yong-hong 李小湘;姚奕;潘孝武;黎用朝;刘文强;刘利成;盛新年;康旭梅;段永红(湖南省农业科学院水稻研究所农业部长江中下游籼稻遗传育种重点实验室,湖南长沙410125)

机构地区：Hunan Rice Research Institute,Hunan Academy of Agricultural Sciences,Key Laboratory of Indica Rice Genetics and Breeding in Middle and Lower Reaches of Yangtze River,Minister of Agriculture,Changsha 410125,PRC

出　　处：《Agricultural Science & Technology》2018年第1期1-10,共10页农业科学与技术（英文版）

基　　金：湖南省农业科学院-省自然科学基金委联合资助项目(14JJ6052);国家现代农业产业技术体系建设专项(nycytx-001);公益性行业(农业)科研专项(201303007)~~

摘　　要：Rice is extremely sensitive to high temperature, especially at the fowering stage. Identifying new germplasm and breeding heat-resistant rice varieties are therefore essential. After multi-year evaluations, a heat-resistant rice landrace D43 was identifed in our previous research. In this study, the relationship between heat resistance and flower opening time （FOT） was analyzed both in the field and in phytotron. The results showed that high temperature could accelerate fower opening of a range of rice varieties. The D43 showed early morning fowering （EMF） habit in different conditions, and the FOT of which was mainly concentrated in the period of 8：30~10：00 AM under high temperature. The spikelet fertility of D43 was relatively low after exposure to invariably high temperature during fower opening. However, the EMF habit of D43 was conducive to avoiding mid-day high temperature, and therefore increased the spikelet fertility under rising high temperature conditions in the feld and in phytotron. In addition, morphological traits including the anther dehiscence rate, the total number and germinated number of pollens on the stigma were signifcantly correlated with the spikelet fertility, and therefore they could be used to evaluate rice heat resistance at anthesis.水稻在抽穗开花期对高温胁迫非常敏感,通过挖掘耐热资源,培育耐热水稻品种是应对高温热害最有效的方式。前期研究发现,地方稻资源D43在花期连续高温条件下能保持较高的结实率。本研究在大田和人工气候室不同高温处理下,分析了D43的开花时间与耐热性之间的相互关系。结果表明,高温能够使水稻的开花时间提前,D43表现出稳定的早花时特性,高温胁迫下的开花时间集中在8:30~10:00;在开花时间段恒定高温胁迫下,D43的结实率较低;但在大田高温和人工气候室模拟高温胁迫下,D43的开花时间避开了日高温段,从而表现出较高的结实率;花器官形态性状包括花药开裂率、柱头上的花粉附着数、花粉萌发数与结实率之间呈显著正相关,因此可用于评价水稻的花期耐热性。

关 键 词：RICE Heat resistance Flower opening time 

分 类 号：S511[农业科学—作物学]