玉米Reid-Lan.渗入Tuxpeno种质的育种潜力分析

Analysis of Breeding Potential of Maize Germplasm Derived from Tuxpeno with Introgression of Reid-Lan

为进一步加大Tuxpeno种质在育种中的利用,发挥Reid-Lan.种质的遗传优势,本研究在Reid-Lan.渗入Tuxpeno形成新种质群体(RLT)选系的基础上,选取1个Reid-Lan.种质代表自交系和6个RLT种质选系为被测系,5个不同类群代表系为测验种,采用NCⅡ遗传交配设计获得的35个杂交组合为材料,在贵州省贵阳和德江对不同组合的产量性状进行鉴定,结合6万个Maize SNP50基因芯片对所涉及到的12个自交系进行遗传评价。结果表明,RLT种质选系QB2539的产量一般配合力(GCA)最高为7.28,高于Reid-Lan.选系QB662。遗传距离(GD)分析结果显示,QB662与QR273的GD值为0.3689;而Tuxpeno代表性种质赞S122与QR273的GD值为0.3554;QB2539与QR273的GD提高到0.3732。35个组合中,产量排前3位的是RLT种质选系与Suwan种质组配的组合,其中QB2539×QR273产量最高,较对照黔单16增产29.66%。这些研究结果初步揭示了Reid-Lan.渗入Tuxpeno形成的新种质RLT在育种中具有广泛的应用潜力,将为下一步的种源创新提供新的改良方法和材料支撑。

One inbred of maize Reid-Lan.,and 6 inbreds of maize RLT(Reid-Lan.×Tuxpeno)were selected for testing,with 5 representative inbreds derived from 5 different subgroups as testers.35 hybrids obtained from crossing the 12 inbreds by using the NCII genetic mating design and grown in Guiyang and Dejiang of Guizhou province were evaluated for their yield-related traits,and the 12 inbreds were evaluated by using the gene chip Maize SNP50 containing 60000 SNPs,in order to enhance the utilization potential of Tuxpeno and to take advantage of the genetic prepotency of Reid-Lan.germplasm in breeding.The results showed that the inbred QB2539 derived from RLT had the highest GCA of 7.28,which was higher than that of QB662 derived from Reid-Lan..The genetic distance(GD)value between Reid-Lan.germplasm inbred QB662 and QR273 was 0.3689,and the GD value between Tuxpeno germplasm inbred S122 and QR273 was 0.3554,whereas the GD value between RLT germplasm inbred QB2539 and QR273 was 0.3732.Hybrids from the combination of RLT and Suwan germplasm were the top three among all the 35 combinations in regard to yield,among which QB2539×QR273 had the highest yield,with a 29.66%increase over the CK of Qiandan 16.These results revealed the potential of RLT germplasm for wide use in maize breeding,and would provide some new improved methods and material support for maize germplasm innovation.