Phytopathology. 2000 Mar;90(3):292-6. doi: 10.1094/PHYTO.2000.90.3.292.
ABSTRACT The inheritance of resistance to Aspergillus ear rot and aflatoxin production in corn (Zea mays L.) caused by Aspergillus flavus was studied in progeny derived from crosses between the resistant corn inbred cv. Tex6 and susceptible inbred cvs. B73 and Mo17. From 1994 to 1996, plant generations included were the P(1) (susceptible B73 or Mo17), P(2) (resistant Tex6), F(1), F(2), F(3), BCP(1), BCP(1)-selfed, and BCP(2). The BCP(2)-selfed generation was added in 1995 and 1996 for the B73 x Tex6 cross. Primary ears were pinboard inoculated and evaluated for Aspergillus ear rot severity. F(1) means deviated from the midparent value toward resistance for aflatoxin production and toward susceptibility for ear rot in both crosses. Analyses of generation means indicate that additive gene action was most important in the resistance to both ear rot and aflatoxin production in the B73 x Tex6 cross. Mo17 was somewhat resistant to both traits, so resistance from Tex6 was not well defined in this cross. Broad-sense heritabilities for ear rot and aflatoxin production were 58 and 63% for Mo17 x Tex6, and 66 and 65% for B73 x Tex6. Narrow-sense heritabilities for ear rot and aflatoxin production were 39 and 45% for B73 x Tex6. It is estimated that one cycle of selection for resistance within B73 x Tex6 F(3) families would reduce the percentage of ear rot severity by 8.5% and aflatoxin concentration by 19 ng/g.
摘要 本研究以对黄曲霉菌（ Aspergillus flavus ）引起的玉米（ Zea mays L. ）赤霉病和黄曲霉毒素产生具有抗性的自交系 Tex6 与感病自交系 B73 和 Mo17 杂交产生的后代为材料，研究玉米对黄曲霉菌赤霉病和黄曲霉毒素产生的抗性遗传。1994 年至 1996 年，包括 P1 （易感 B73 或 Mo17 ）、P2 （抗性 Tex6 ）、F1 、F2 、F3 、BCP1 、BCP1-自交和 BCP2 。1995 年和 1996 年在 B73 x Tex6 杂交中添加了 BCP2-自交世代。主要耳Pinboard 接种并评价赤霉病严重度。F1 平均值偏向抗性，偏向生产黄曲霉毒素，偏向易感性在这两个交叉。世代平均值分析表明，加性基因作用在 B73 x Tex6 杂交中对赤霉病和黄曲霉毒素产生的抗性最重要。Mo17 对这两个性状都有一定的抗性，所以 Tex6 的抗性在这个杂交中没有很好地定义。Mo17 x Tex6 的赤霉病和黄曲霉毒素产生的广义遗传力分别为 58%和 63%，B73 x Tex6 的广义遗传力分别为 66%和 65%。Mo17 x Tex6 的狭义遗传力分别为赤霉病和黄曲霉毒素产生的 39%和 45%。据估计，在 B73 x Tex6 F3 家系中进行一次抗性选择，可使赤霉病严重度降低 8.5%，黄曲霉毒素浓度降低 19 ng/g。
