%A WANG Bo-Xin,WANG Ya-Hui,CHEN Peng-Fei,LIU Xu-Dong-Yu,FENG Zhi-Qian,HAO Yin-Chuan,ZHANG Ren-He,ZHANG Xing-Hua,XUE Ji-Quan* %T Combining Ability of Maize Inbred Lines from ShaanA Group and Shaan B Group under Different Density Conditions %0 Journal Article %D 2017 %J Acta Agronomica Sinica %R 10.3724/SP.J.1006.2017.01328 %P 1328-1336 %V 43 %N 09 %U {https://zwxb.chinacrops.org/CN/abstract/article_6328.shtml} %8 2017-09-12 %X

The objective of this study was to investigate the effectiveness of high-density breeding strategy through analyzing genetic components and general combining ability (GCA) effectsunder different planting densities. Seventeen maize inbred lines selected under high density were test-crossed with two testers (Zheng 58, Chang 7-2) in the North Carolina Design II. Thirty-four crosses were evaluated under different density conditions (45 000, 67 500, and 90 000 plants ha-1) in 2014 and 2015 at Yangling, Changwu and Yulin in Shaanxi province. The genetic variance components for grain yield and other traits were estimated using PROC VARCOMP method. Frequency distribution was used to analyze the response of GCA for grain yield and other traits under different densities. The stability of maize inbred lines and crosses was evaluated based on AMMI model. The grain yield, stalk lodging rate and rind penetration strength were mostly controlled by additive gene action, while the inheritance of sterile plant rate controlled by non-additive gene action. Also, the contribution of additive gene action to total variance increasedwith increasing planting density. The average of general combining ability for grain yield, sterile plant rate, stalk lodging rate and rind penetration strength increased by 0.28, -0.21, -0.03, and 0.02, respectively, from low density to high density. The correlations between GCA of the inbred lines and their crosses were significant (r=0.877**, r=0.811**, r=0.672**) under different density. As the density increased, the number of stable maize inbred lines and crosses increased. These results indicate that increasing plant density to improve GCA for grain yield and other traits of inbred lines is an effective strategy to enhance tolerance to high plant density and yield stability.