不同生态环境对玉米杂交后代选择效果的分析

本文分析了外来X系新种质一优良单交种F2和F3世代的分离群体在不同生态环境下的选择效果。结果表明，在东华北、西北春玉米区优良果穗入选率较高，单穗平均粒重较高；在黄淮海玉米区优良果穗入选率较低，单穗平均粒重较低。认为在东华北、西北生态环境下，有利于对玉米杂交分离后代的产量潜力选择；在黄淮海地区则有利于对多种抗性和病虫害的选择。不同生态环境间的变换地穿梭育种选择，有利于对玉米杂交分离后代的单株的产量潜力和耐多种抗性和病虫害的有效选择。

Effects of Different Ecological Conditions on Selection of Progenies of Maize

The F2 and F3 progenies of one single crosse introduced recent year were selected for high yielding breeding in different ecological conditions under high density(90 thousand/hm2),respectively,to which the selection response was investigated.The results showed that the selected ratio and the mean grain weight per ear of superior ears from Northeast and Northwest part of Chinese maize areas was greater than that from Huanghuhai.Ecological conditions in Northeast and Northwest part of China were thought to be beneficial on the selection for high yield potential of progenies of maize crosses,while ecological conditions in Huanghuaihai China for resistances of many diseases,insects and other abiologic stresses,In maize breeding strategies,selection in different ecological conditions alternately was helpful for the both yielding potential per plant and resistances for diseases and insects selection.