【摘要】 对115份优质早籼稻新品系的产量性状与产量的相关分析和通径分析结果表明:各产量性状均与产量呈正相关,除株高外,其余5个性状与产量的相关均达极显著或显著水平,产量性状之间存在着相互制约和相互依赖的关系;每穴穗数对产量的贡献最大(47.84%),其次为每穗总粒数(21.86%),再次为千粒重和结实率(分别为14.47%和9.46%)。根据分析结果,笔者认为优质早籼稻高产育种应主攻分蘖和提高分蘖成穗率,同时注意提高每穗粒数和千粒重。优质早籼稻高产(即产量达500￣600kg/667m2)育种的产量性状模式为单株有效穗8￣10穗、每穗总粒数125￣150粒、结实率80%以上、千粒重24￣27g。更多还原

【Abstract】 The relation and path analysis of yield traits and yield were conducte d using 115 new good-quality early indica rice cultivars. The results showed tha t there were positive relations between the yield traits and their yield. Apart form the plant height, the others were highly significant or significant positiv e correlations with their yield, and among the yield traits there existed restri ctive and dependent relationship. The order of contribution rate of traits to th e yield were: the panicles per plant (47.84%), grain number per panicle (21.86%) , 1 000 grains weight and setting percentage (14.47% and 9.46%). According to th e result of the analysis, the author suggested that the high-yield breeding of t he good-quality early indica rice should increase tiller and rate of effective t iller, and at the same time we should pay attention to improve grain number per panicle and 1000 grain weight. The high-yield breeding pattern of good-quality e arly indica rice (ie. The yield can reach 500~600 kg per 667 m2) is that the pan icles per plant should reach 8~10 panicles, 125~150 grains per panicle, over 80% setting percentage and 1 000 grains weight 24~27g.更多还原