Analysis on Phenotypic, Physiological and Genetic Characteristics of Large Grain Rice Line lg1

作     者：汪欲鹏 欧阳鸿飞 王智权 江卫平 彭新红 韩瑞才 谭雪明 石庆华 潘晓华 吴自明 

作者机构：作物生理生态与遗传育种教育部重点实验室/江西省作物生理生态与遗传育种重点实验室/双季稻现代化生产协同创新中心江西南昌330045 江西省安福县农科所江西吉安343200 江西省农业科学院水稻研究所江西南昌330200 

出 版 物：《Agricultural Science & Technology》 (农业科学与技术（英文版）)

年 卷 期：2016年第17卷第10期

页      面：2247-2252,2348页

学科分类：09[农学] 0901[农学-作物学] 

基　　金：Supported by National Natural Science Foundation of China(31560350) Science and Technology Support Program of Jiangxi Province(20121BBF60009,20132BBF60004) 

主　　题：Rice Large grain Photosynthesis Grain filling Correlations 

摘      要：In this study, phenotypic, physiological and genetic characteristics of large grain rice line Igl were investigated. The results showed that Igl exhibited tall plants, long spikes and large grains, with a 1 000-grain weight of 47.58 g. In addition, Igl had strong photosynthetic capacity, but the stomatal conductance-and intercellular CO2 concentration were 32.1% and 3.94% lower compared with 9311, respectively. Igl displayed synchronous grain filling, and there were no significant differences between the contribution rates of superior and inferior grains at the early, middle and late grain-filling stages, but the grain-filling duration of superior grains was longer than that of inferior grains. The genetic analysis indicated that grain length, grain width, length-width ratio, grain thickness and 1 000-grain weight of F2 population obeyed normal distribution, which were quantitative trait loci controlled by multiple genes. The correlation analysis showed that there was an extremely significant positive correlation between grain width and grain length; grain length, grain width and grain thickness exhibited extremely significant positive correlations with 1 000-grain weight and extremely significant negative correlations with length-width ratio, it might be concluded that grain width, grain length, length-width ratio, grain thickness and 1 000- grain weight were controlled by one or more common QTLs. These results provided theoretic basis for the application of large grain rice line Igl in super high-yielding rice breeding.