关键词: ≥10℃积温距平, ≥10℃积温距平, 玉米冷害, 指标, 玉米单产

Abstract: By analyzing the characteristics of the new maize hybrid ‘Yudan 112’, it will be hoped to provide theoretical basis for the widespread application. The elite maize hybrid ‘Yudan 112’ derived from the crossing between the excellent inbred lines ‘L217’ and ‘L119A’, which were developed by continuous selfing and combining with haploid breeding technology. The yield, grain quality and diseases resistance of ‘Yudan 112’ were analyzed based on the region experiments at 17 locations across two years. The results showed that the yield of ‘Yudan 112’ was higher with over 9 percentage than that of the check hybrid ‘Zhengdan 958’. The ear traits for ear length, kernels per row, cob diameter, grain yield per ear and seed rate of ‘Yudan 112’ were better than those of the control. ‘Yudan 112’ with bulk density of 782 g/L, crude protein of 12.4%, crude oil of 4.04%, crude starch of 70.84% and lysine of 0.33%, was a high quality hybrid. It performed multi-disease resistance, especially, the resistances to the Helminthosporium maydis, Curvularia lunata and MDMV (maize dwarf mosaic virus) were better than those of the check. The genetic basis of ‘Yudan 112’ was significantly different from those of the hybrids ‘Zhengdan 958’ and ‘Pioneer 335’, which were most widely planted in China presently. Therefore, ‘Yudan 112’ was a new type of maize hybrid with strong heterosis, and would have a broad application prospect.