水稻植株农艺性状与稻米碾磨品质的遗传相关性分析

以４５个籼稻组合为材料，研究了一些属于不同遗传类型性状间的相关性．结果表明，控制植株农艺性状的遗传效应与影响稻米碾磨品质性状的遗传效应间，存在较强的相关性．其中以加性效应间的相关性尤为明显．有效穗数、剑叶长宽比和谷粒宽等性状与稻米碾磨品质性状间，存在着明显的正相关，而株高、剑叶长、穗长、每穗粒数、谷粒长和谷粒长宽比等性状与稻米碾磨品质性状间，则表现为负相关．有效穗数与糙米率等成对性状间的显性效应相关性，有助于同时改良杂交稻组合的这些性状

Analysis of genetic covariances between plant agronomic traits and milling quality traits of indica rice.

Analysis of genetic covariances was made between plant agronomic traits and milling quality traits of indica rice ( Oryza sativa L.) using 45 crosses based on the genetic model for quantitative traits with unequal design matrices in cereal crops. The agronomic traits of plant were plant height (PH), effective panicles per plant (EPPP), length of flag leaf (LFL), ratio of length to width of flag leaf (RLWFL), panicle length (PL), grains per panicle (GPP) , grain length (GL), grain width (GW), ratio of length to width of grain ( RLWG) and the milling quality traits were brown rice weight (BRW), milled rice weight (MRW), brown rice recovery (BRR), milled rice recovery (MRR), and head milled rice recovery (HMRR). The results indicated that stronger relationships existed between the genetic effects of plant agronomic traits and milling quality traits of rice, especially for the relationships of additive effects. There were significant positive relationships between EPPP, RLWFL, or GW and all milling quality traits, but significant negative relationships were found between PH, LFL, PL, GPP, GL, or RLWG and all milling quality traits. The dominance relationships for the pairwise traits, such as EPPP and BRR, were applicable for hybrid rice breeding.