不同矮秆基因小麦农艺性状的遗传差异

对含有不同主效矮秆基因（Ｒｈｔ１，Ｒｈｔ２和Ｒｈｔ１＋Ｒｈｔ２）的三组春小麦进行了两年，两地试验。结果表明，具有半矮秆基因Ｒｈｔ１的小麦表现出较高的生物产量，穗粒数和容重，它们以此获得较高的籽粒产量；具有矮秆基因Ｒｈｔ１和Ｒｈｔ２的小麦，则表现出较高的千粒重，通过半大收获指数获得高产；在两个半矮秆组内，籽粒产量与株高之间，粒数／ｍ＾２与千粒重之间均为显著负相关，就矮秆组而言，在籽粒产量与粒数／ｍ＾

Genetic Differences of Agronomic Characteristics in Wheat Groups with Different Dwarf Genes

Three groups of spring wheat varieties with different major dwarf genes (Rht1,Rht2 and Rht1 +Rht2) were tested at two sites for two years. The results were as follows. The wheat group with semidwarf gene Rht1 enhanced high grain yield as a result of high aboveground biomass yield. more grains per spike and highest weight. The wheat group with dwarf gene Rht1 +Rht2 obtained high grain yield by increasing 1000-grain weight and enhancing harvest index.Significant negative correlations were found between grain yield and plant height and between grains per square metre and 1000-grain weight in two wheatgroups wich either Rht1 or Rht2.In the wheat group with double dwarf genes. significantly positive correlations were detected between grain yield with grains per square metre. biomass yield. biomass yield rate. and between biomass yield and grains per square metre. Different dwarf gene compositions in different varieties produced different relations between two characteristics.