分子标记辅助选育抗南方锈病玉米品种‘伟育618’

Molecular Marker-assisted Selection of Maize Variety 'Weiyu618' with Resistance to Southern Corn Rust

为培育丰产、稳产、综合抗性优良的玉米新品种,本研究以携带南方锈病主效抗性基因的材料为亲本,通过单倍体育种与分子标记辅助育种技术相结合,育成玉米新品种‘伟育618’。利用区域试验(2016年和2017年)和生产试验(2017年)数据,通过Shukla稳定性分析方法、高稳系数法和适应度对‘伟育618’的丰产性、稳产性及适应性进行分析。结果表明,两年区域试验‘伟育618’的平均产量为10 599.98 kg/hm^(2),较对照‘郑单958’增产9.60%,均居同组第一位,表现出良好的丰产性。两年区试的Shukla变异系数分别为5.50%、7.85%,在同组中处于较低水平;高稳系数分别达到89.64%和85.85%,在同组参试品种中均居第一位;适应度分别为47.06%和58.33%,均优于对照‘郑单958’;综合分析结果表明‘伟育618’丰产稳产适应性突出。产量相关分析表明,‘伟育618’产量与穗粒重和百粒重呈极显著和显著相关,生产中应增加穗粒重,以发挥其增产潜力。

In order to cultivate a new maize variety with high yield, stable yield, and excellent comprehensive resistance, this study used materials carrying the main resistance gene of southern corn rust as parents, and combined haploid breeding with molecular marker-assisted selection technology to cultivate a new maize variety 'Weiyu-618'. Based on the summary data of the regional trials(2016 and 2017) and production trials(2017) of Huanghuai-hai summer maize region, the high yield, stability, and adaptability of 'Weiyu618' was analyzed by Shukla stability analysis method, high stability coefficient(HSC) method and fitness. The results showed that the average yield of 'Weiyu618' in the two-year regional trial was 10 599.98 kg/hm2, which increased by 9.60% compared to the control 'Zhengdan 958', ranking first in the same group and demonstrating good fertility. The Shukla coefficient of variation were 5.50% and 7.85% in the two-year regional trial, respectively, which were at a lower level in the same group. The HSC reached 89.64% and 85.85% respectively, ranking first among the tested varieties in the same group. The fitness was 47.06%% and 58.33% respectively, both better than the control 'Zhengdan 958'. These results indicate that 'Weiyu618' has outstanding adaptability to high and stable yield. Correlation analysis shows that there is a highly significant and significant correlation between yield and grain weight per ear and 100-kernel weight in 'Weiyu618'. Therefore, it is necessary to increase the grain weight per ear in production to maximize its yield potential.