小麦不同光合器官对穗粒重的作用及基因差异研究

通过剪叶、包穗、包秆等处理研究了小麦不同器官对粒重的作用，并对其基因型差异进行了分析。结果表明，不同器官对千粒重的贡献在器官之间有极显著的差异，而在基因型间差异不显著，对穗粒重的贡献在器官之间及基因型与器官的互作间呈极显著差异（穗和叶之间差异不显著），而基因型之间的差异不显著。各器官对粒重的 贡献与株高有一定的关系。在一定株高范围内，叶片对粒重的贡献随穗面积的增大而增加，穗对粒重的贡献随穗面积的增大而有减小的趋势，茎鞘光合的贡献与穗面积和株高呈正相关，贮藏物质的贡献与叶片的贡献呈显著负相关。株高与千粒重间呈极显著正相关，与穗粒数呈显著负相关；单茎叶面积与穗粒重呈显著正相关，穗面积、穗粒重与穗粒数呈显著正相关。

A Study on theContribution of Different Organs to Grain Weight in Different Genotype Wheat

The contribution of different organs to grain weight in different genotype wheat were studied through the treatments of defoliate, darken ear and darken stem. The results were as follows: there were significant differences among different organs in the contribution to 1000 grain weight, and no significant differences among different genotypes, to the per ear grain weight, the difference among different organs and the mutual reaction between genotypes and organs was significant, among the genotypes ,it was not significant. The contribution to grain weight of different organs was related to plant height. In a range of plant height, with the accretion of ear area, the contribution of leaf to grain weight increased, and there was a decline trends in that of ear. There was a positive correlation between the contribution of sheath and ear area or plant height. The contribution of reserved substance of stems was negative correlation with the contribution of leaves. Plant height was positive correlation with 1000 grain weight, and negative correlation with the grain number per ear. Leaf area per stem was positive correlation with grain weight per ear. Ear area and grain weight per ear were positively correlation with grain number per ear.