玉米自交系黄早四籽粒白顶的初步研究

A STUDY ON WHITE TIP-GRAINS OF ZEA MAIZE INBREED LINE HUANGZAO

通过对分别具有黄早四、Ｍｏ１７或同时具有两者血缘的三组不同杂交组合Ｆ＿１果穗上白顶籽粒的研究分析，发现户单１号的籽粒白顶性状是其双亲共同作用的结果，自交系黄早四的籽粒白顶可遗传给后代，而Ｍｏ１７对其表现起一定作用，当杂交种同时具有两者血缘时，果穗上正常籽粒与白顶籽粒相间着生。不完全双列杂交结果表明，黄早四改良系的杂交种也存在籽粒白顶现象，但白顶籽粒的比率各改良系杂交种间差异较大，且低于黄早四的杂交种；Ｍｏ１７的衍生系对黄早四籽粒白顶性状的遇传表现也有作用，但其作用的程度小于Ｍｏ１７。

Three groups of crosses are surveyed for white tip-grains on F_1 ears, which have Huangzao4, Mo17 or both in their ancestors. It is founded that Hudan 1’s white tip-grain is a co-effectiveresult of its parents , and white tip-grains of Huangzao 4 are inheritable, but affected by Mo17。The hybrids with both of them in their ancestors bear white tip-grains alternating with normalyellow grains。 In the uncomplete dialle crosses, the hybrid of Huangzao 4’s derivative lines alsohave white tip-grains although the percentage of them is less than that of Huangzao 4’s hybridsand different among the hybrids of various derivative lines。 The derivative lines of Mo17 also af-fect the heridity of Huangzao 4’s white tip-grains, but less than that of Mo17。