不同密度下欧洲玉米种质BRC选系的应用潜力分析  

Potential Application of European Germplasm BRC in Different Planting Densities

作　　者：周旭梅[1] 高旭东[1] 丰光[1] 高洪敏[1] 何晶[1] 

机构地区：[1]丹东农业科学院,辽宁凤城118109

出　　处：《玉米科学》2017年第4期26-31,共6页Journal of Maize Sciences

基　　金：国家科技支撑计划项目"春玉米区商业化育种技术研究与示范"(2014BAD01B01);国家"863"计划课题"强优势玉米杂交种的创制与应用"(2011AA10A103)

摘　　要：以5个优良的欧洲玉米种质BRC自交系为母本、5个不同来源的优良自交系为父本,采用NCⅡ设计,组配25个杂交组合,在3种密度下对欧洲玉米种质BRC选系的杂种优势表现和配合力进行研究。结果表明,不同密度下,F_1代单株产量杂种优势普遍存在,变化趋势是随密度增加而降低。自交系BRC-1在60 000株/hm^2密度下有较高的GCA效应;自交系BRC-5在3个密度条件下均有较高的GCA效应,且随着密度的增加,GCA效应增加。同一组合在不同密度下SCA效应存在较大差异,SCA效应增减与密度增减的变化方向不一致。在3种密度下,总配合力较高的组合分别为BRC-5×D37、BRC-5×S121和BRC-5×HG162,在不同密度下单株产量的总配合力效应与杂种优势极显著正相关。综合分析认为,自交系BRC-5和BRC-1在实际育种中有较大的利用价值,用自交系BRC-5容易组配出高产耐密组合。欧洲种质×塘四平头和欧洲种质×旅大红骨+塘四平头的杂优模式在高产耐密杂交种选育中有很大的应用潜力。Twenty five hybrids were obtained by five inbred lines selected from European germplasm BRC crossed with 5 inbred lines with different germplasm according to NC Ⅱ design. Heterosis and combining ability of the combinations in different densities were analyzed. The results showed that the heterosis of yield per plant of F, generation was widespread, and the variation trend was reduced with density increasing. The GCA of inbred line BRC- 1 was higher than the other lines in the density of 60 000 plant/ha; the inbred line BRC-5 had high GCA in 3 different densities, and the GCA effect was increased with the density increased. The SCA effect of the same combi- nation in different densities was different, and the change of SCA effect was not consistent with the change direction of density. The combination with the highest TCA of 60 000 plant/ha, 67 500 plant/ha, 75 000 plant/ha was respec- tively BRC-5xD37, BRC-5xS121and BRC-5xHG162, and the TCA effect of per plant yield under different densi- ties was significantly positively correlated with heterosis. In conclusion, the inbred lines BRC-5 and BRC-1 were very useful in practical breeding, and the combinations with high yield and high density tolerance were easy to get by crossing using BRC-5 as a parent. European germplasm x Tang Siping Tou and European germplasm x Lvda- honggu ＋ Tang Siping Tou were good heterotic models and had great potential application in high yield and high density tolerance hybrid breeding.

关 键 词：玉米 欧洲种质 种植密度 杂种优势 配合力 应用潜力 

分 类 号：S513.035.1[农业科学—作物学]