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为了选育产量因素高度协调的籼粳亚种间杂交稻，有必要对其穗粒结构进行理论分析．通过对２４个两系法籼粳亚种间组合的产量因素与产量的遗传相关分析，得出以下结论：亚种间杂交稻单株粒重显著高于品种间杂交稻，２４个组合中有６个组合与汕优６３比有正向竞争优势；产量因素中，每穗总颖花数、每穗实粒数和千粒重与单株粒重的遗传相关系数为正值并达显著水平．通径分析结果表明，对单株粒重的影响大小依次为每穗实粒数、千粒重、单株穗数、充实系数、结实率和每穗总颖花数；充实系数可作为产量构成因素协调指标和源库关系协调指标
In order to breed indica-japonica subspecies hybrid rice with high yield factors, it is necessary to make theoretical analysis on its grain structure. Through the genetic correlation analysis of the yield factors and yield of 24 two-line indica-japonica subspecies combinations, the following conclusions were drawn: The grain weight per plant of inter-subspecific hybrid rice was significantly higher than that of hybrid rice with 24 subspecies The six combinations had a positive competitive advantage with Shanyou63. Among the yield components, the genetic correlation coefficients of total spikelets per panicle, grains per spike, and 1000-grain weight per plant weight were positive and significant. The results of path analysis showed that the effect on grain weight per plant was order grain number per plant, grain weight per plant, spike number per plant, coefficient of enrichment, seed setting rate and total spikelet number per spike. The coefficient of enrichment could be used as the component of yield formation Indicators and source library relations coordination index