京、津、冀、鲁、豫主要玉米优势种质组合模式及其演化趋向

The Germplasm Combination Pattern of Main Corn and It′s Development Trend in Tianjin, Beijing,Hebei,Shandong and Henan Province

基本模式主要有四×L、四×R、旅×L、旅×R与四×获5 种;复合模式则包括由诸多多元复合种质构成的如四( 获×L) 、R( 四×旅) 等。复合模式在玉米杂优育种中渐趋突出。应用基本模式良好的融合性构建复合模式,代表了优势种质组合模式演化的基本趋向。发掘、创新现有种质资源,引入美国玉米带和热带- 亚热带优势种质组合模式及其相应种质,分别与京、津、冀、鲁、豫优势种质组合模式的相应种质对应进行“温×热”互导,是优势种质组合模式演化的两条主要途径。

Based on the facts of the utilization of corn germplasm type in Tianjin,Beijing,Hebei,Shandong and Henan(TBHSH),the types of superiority germplasm combination are divided into the base germplasm and superiority germplasm combinations.The base germplasm types are mainly “Si×L”,“Si×R”,“Lü×L”,“Lü×R”and “Si×Huo”,the superiority germplasm combinations are mainly “Si/(Huo×L)”,“R/(Si×Lü)”.Combined types play more and more outstanding role in hybrid corn study,and represent a future trend.By using the excellent combination ability of the base germplasm type is the trend of evolution of superiory germplasm combination.The exploration and renew existing germplasm resources,introduce the superiority germplasm combination and its related germplasm from American cornzone and tropical subtropical region,tropical temperature trans introduce of the superiority germplasm combination with that in TBHSH correspondingly is the two main way of superiory germplasm combination utilization.