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以两个典型的籼粳交重组自交系F6群体(RILSA:中优早8号/丰锦、RILSB:七山占/秋光)为试材,分别在四川和辽宁同年种植,研究亚种特性和经济性状变化规律及其相互关系的结果表明,不同生态条件下籼粳交后代的亚种特性和经济性状都发生了显著的变化.生态条件对程氏指数和构成性状的影响因群体和性状而异,RILSA群体在四川和辽宁都呈偏粳分布,RILSB群体在辽宁接近正态分布,在四川呈偏粳分布,总体上四川表现比辽宁更加偏粳.与辽宁相比,四川穗数、结实率和千粒重降低,因而产量极显著下降,而穗粒数在不同地区和不同群体间差异不显著.程氏指数和构成性状与产量和经济性状有正相关的趋势,据此进行人工选择可能是北方稻区籼粳稻杂交育成品种仍然基本保持粳亚种特性的重要原因.此外,还讨论了籼粳分化与生态条件的关系等相关问题.
Two typical indica-japonica crosses inbred lines F6 (RILSA: Zhongyouzao 8 / Fengjin, RILSB: Qishanzhan / Qiu-Guang) were used as materials to plant subspecies The results showed that the subspecies and economic traits of offspring of indica and japonica crosses varied significantly under different ecological conditions.Effects of ecological conditions on Cheng’s index and its constituent traits were affected by population and traits RILSA populations in Sichuan and Liaoning Province were both partial japonica distribution, RILSB population in Liaoning near normal distribution, partial japonica distribution in Sichuan, Sichuan overall performance more than japonica Liaoning.Compared with Liaoning, Sichuan spike number, Seed setting rate and 1000-grain weight decreased significantly, and the grain yield decreased significantly in different regions and different groups.The Cheng’s index and its constituent traits had a positive correlation with yield and economic traits, and thus the possibility of manual selection Is an important reason why the indica-japonica hybrid rice varieties still maintain the characteristics of japonica subspecies in northern rice areas.In addition, the relationship between indica-japonica differentiation and ecological conditions and other related issues are also discussed.