The Best Maize Inbred Lines Selected Under the Different Density Conditions

Taking PH4CV×chang7-2 as the basic material, inbred lines were selected under the selective pressure of 6×10⁴, 9×10⁴, 1.2×10⁵ and 1.5×10⁵ plants/hm².The NCⅡdesign was composed of 4 backbone inbred lines and 5 representative lines which were selected from the F4 generation, and the yield performance, GCA and SCA were analyzed. The results indicated that GCA of 5 inbred lines selected under the 1.2×10⁵ plants/hm² were all positive, and the highest value 12F-3 was 12.74, the parents who had the highest value of SCA also came from the inbred lines under the selective density of 1.2×10⁵ plants/hm². Meanwhile，the yield of the combination which derived from that density was much higher than the best of CK，and the highest grain yield per plot was 15.57 kg from PH6WC×12F-5. The 1.2×10⁵ plants/hm² was considered the best density for PH4CV×Chang7-2 combination among the 4 selective densities.