杂交粳稻后代经济性状变化规律及其相关性研究

Performances of Economic Characters and Their Correlations of of Rice Hybrid Progenies

以优418和辽优3225、亲本及其后代株系为试材 ,对杂交粳稻后代经济性状变化规律的研究结果表明 :两个组合产量杂种优势明显 ,平均优势分别为17.7 %和18.5% ;从产量结构看每穗成粒数是主要原因 ,平均优势分别为11.6 %和9.8 % ;从物质生产与分配看生物产量是主要原因 ,平均优势分别为14.7%和15.4% ;后代株系产量与生物产量和每穗粒数呈极显著的正相关 ,与其他因素的关系因组合而异 ,产量及其构成因素均表现为连续变异 ;两个组合后代分别有约10%和5 %的株系产量达到或超过F1,经济系数和每穗粒数是这些株系高产的主要原因。

Rice hybrids Tiyou 418, Liaoyou 3225, their parents and progenies were studied, and the results are as follows: The heterosis of the 2 rice hybrids was evident, with dominants 17.7% and 18.5% , respectively. From the aspect of yield components, the increase of seeds per panicle contributed the most, with average dominants 11.6% and 9.8% , respectively; while from the aspect of biomass production and partition, bio-yield contributed the most, with average dominants 14.7% and 15.4% , respectively. The correlations between the yields of progenies and bio-yields or seeds per panicle were significant at 0.01level; their correlations with other yield components were different from combinations. The yields and yield components showed continuous changes. There were 10% and 5% progenies from the two combinations yielded the same or higher than the F1 plants as a result of higher harvest index and panicle seeds.