论文部分内容阅读
通过对我国各麦区代表性小麦品种的源库结构及其演变和光合生产特性的研究指出:依生态地区和栽培水平不同,其适应型小麦品种的源库结构是不同的,这是在生态环境和产量选择的压力下品种源库结构进行调整的结果;高产稳产品种应是与生态条件相协调的源库流最佳结构型;原始品种和早期改良品种的前期(起身至开花)光合生产率高于现代高产品种,后期(开花至黄熟)则相反;库强度的变化是导致同化率差异的主要原因。参照库源反馈模式把品种分为前期优势型、均势型和后期优势型三种光合生产型。在分析我国现代品种的系谱及其基础亲本源库结构的基础上把我国小麦产区划分为C、O两大源库生态区。探讨了高产品种的选育途径和小麦育种若干策略问题。
Based on the study of the structure of source and sink, and the evolution and photosynthetic characteristics of representative wheat cultivars in different wheat regions in China, it is pointed out that the structure of source and sink of adapted wheat cultivars is different according to different ecological regions and cultivars, Environment and yield selection under the pressure of the source structure of the source library to adjust the results; high-yielding varieties should be consistent with the ecological conditions of the source sinks the best structural type; the original varieties and early improved varieties of early (up to flowering) photosynthesis The productivity was higher than that of modern high-yielding varieties, but the latter was the opposite (from flowering to ripening); the change of the storehouse intensity was the main reason of the difference of assimilation rate. Reference library source feedback mode to the varieties are divided into pre-dominant type, potential type and late-dominant three photosynthetic production type. Based on the analysis of the pedigree of modern varieties in China and the structure of its parental source base, the wheat producing areas in China are divided into two major eco-zones, C and O. The breeding ways of high-yielding varieties and some strategies of wheat breeding were discussed.