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为广泛利用水稻种质资源隐蔽抗旱有利基因来全面改善品种抗旱性,以粳型恢复系C418为轮回亲本,以3个籼型品种(Manawthukha,粤香占,特青)为供体构建了抗旱极端选择导入群体。3个群体两种水分条件对比,千粒重和单株有效穗数均表现出正相关,最大相关系数分别为r=0.88~(**)和r=0.64~(**);不同水分条件下产量构成因子与产量的相关分析结果显示,水分胁迫下单株有效穗数和每穗总粒数在所有群体中都是对产量贡献较大的因子;不同水分条件下产量构成因子与产量的通径分析结果显示,不同群体的产量构成因子之间存在着相互促进或相互制约关系;优良株系在胁迫下单株产量极显著高于轮回亲本充分体现了远缘杂交优势,说明应用回交导入方法利用籼稻优良基因改良粳稻品种是可行的。
In order to comprehensively improve the drought resistance of rice cultivars, a drought-tolerant gene was cloned and used as a drought-tolerant rice cultivar. Four indica varieties (Manawthukha, Yuexiangzhan and Teqing) Extreme choice to import groups. There was a positive correlation between 1000-grain weight and panicles per plant in the three populations. The maximum correlation coefficients were r = 0.88 ~ (**) and r = 0.64 ~ (**) respectively. Under different water conditions, The results of correlation analysis of composition factor and yield showed that the effective panicle number per panicle and the total grain number per panicle were the major contributors to the yield of all the groups under water stress. The pathways of yield components and yield under different water conditions The results showed that the yield components of different groups had mutual promotion or mutual restraint relationship. The yield of the excellent lines under the stress was significantly higher than that of the recurrent parent, which fully demonstrated the advantage of distant hybridization. It is feasible to improve japonica rice varieties by using indica good genes.