两系杂交晚稻整齐度与产量及其构成因素关系研究

Relationship between Plant Evenness and Yield Characters of Two line Hybrid Late Season Rice

对 2 1个两系法杂交晚稻组合杂种一代株高和穗长的整齐度与其产量构成因素及产量性状进行了相关分析和通径分析 ,结果表明 ,株高整齐度与穗长整齐度均对单株产量有显著正效应 ,以株高整齐度对产量的直接作用较大 ;在产量构成因素和整齐性性状中 ,对单株产量的作用大小依次是 :千粒重、单株穗数、株高整齐度、每穗总颖花数、每穗实粒数、穗长、穗长整齐度和株高 .株高整齐度与其他产量因素的相关不显著 ,穗长整齐度与每穗总颖花数和结实率负相关分别达到显著、极显著水平 。

Correlation analysis and path analysis were made on evenness degree of plant height (EDPH) and evenness of degree of panicle (EDD) by using 21 combinations of two line late season hybrid rice.The results show that EDPH and EDD are positively correlated with grain weight per plant significantly at the level of 5% and 1% respectively.Among yield characters and evenness characters,the one which contributes the most to the grain weight per plant is 1 000 grain weight,then panicles per plant number,EDPH, spikelets per panicle, filled spikelets per panicle,panicle length,EDP and plant height.EDPH is not obviously correlated to other yield characters.The negative correlation between evenness of panicle and seed setting rate reaches significant and extremely significant level respectively,but EDD is positively correlated with 1 000 grain weight at extremely significant level.