CIMMYT亚热带优质蛋白玉米自交系的配合力和杂种优势群分析

 采用NCII设计，以齐205、CA375和CA339为测验种，与22个来自于CIMMYT的亚热带QPM自交系配制66个测交组合，经过两年完全区组田间试验，分析22个CIMMYT自交系的配合力和杂种优势群。结果表明，CML181、CML182、CML194、CML179、CML193产量一般配合力较高，在我国的QPM种质改良中有较大的应用价值。来源于群体Pool32、UWO417、WOMTA、CYO和Pool33的自交系与CA375、CA339之间的亲缘关系较近，可划在同一个杂种优势群，定为QA群。来源于群体Pool34和UYO的自交系与齐205的亲缘关系较近，可划在同一杂种优势群，定为QB群。

Combining Ability and Heterotic Grouping of CIMMYT Subtropical Quality Protein Maize Lines

Combining ability and heterotic groups of 22 CIMMYT subtropical quality protein maize (QPM) inbred lines were analyzed based on the data of design II, in which the CIMMYT QPM lines were crossed with 3 QPM testers Qi205, CA375 and CA339 used successfully in China. Field experiments were conducted in two years. The results indicated that a high general combining ability (GCA) of inbred lines CML181, CML182, CML194, CML179 and CML193 was observed and these inbred lines will be used in QPM breeding efforts in China. Inbred lines from populations Pool32, UWO417, WOMTA, CYO and Pool33 were classified into the same heterotic group QA as CA375 and CA339 due to the minor genetic distance among them, while inbred lines from populations Pool34 and UYO showed closer genetic distance with Qi205, and were clustered into the heterotic group QB.