Genetic Analysis of Main Quantitive Characters Between Two Types of Hybrid Rice Combinations and Studies on Tillering Dynamics

The genetic correlation of main quantitive characters between two types of hybrid rice combinations was analyzed.The results showed that the filled grain number per panicle,seed setting rate and effective panicle were positively correlated with yield in P1;the seed setting rate and effective panicle were positively correlated with yield in P2;with the increase of planting density,the effective panicle per panicle of two types of hybrid rice combinations decreased significantly;for the large-spike cultivars,a proper increase of planting density was beneficial to increase the number of effective panicle per hm2,but for the compatible panicle-kernel type,a lower planting density was more suitable for the increase of the number of effective panicle.