Maize (Zea mays L.) is an important crop in sub-Sahara Africa for both human consumption and livestock feed. Maize use is often limited by ear-rotting fungi, some of which produce deleterious secondary metabolites. The aim of this study was to determine the inheritance of resistance to Fusarium verticillioides as an indirect way of selecting for resistance to secondary metabolites such as the mycotoxin fumonisin that is produced by this fungus, under artificial inoculation and natural infection. Twelve inbred lines from Seed Co that were used as the females, were mated to 12 tester lines from the International Institute of Tropical Agriculture (IITA) that were used as males, using the North Carolina Design II. The resulting 144 F₁ hybrids and six check hybrids were evaluated in Zimbabwe. Artificial inoculation with F. verticillioides was done at Rattray Arnold Research Station in the first season. The general (GCA) and specific combining ability (SCA) effects for F. verticillioides incidence were variable across sites for the lines and the testers. Six southern African inbred lines had desirable GCA for F. verticillioides ear rot and can be used as resistance sources. Outstanding testers from IITA that had negative GCA for F. verticillioides ear rot and fumonisins were identified. Both additive and nonadditive effects were implicated in resistance to ear rot caused by F. verticillioides and potential lines were identified that can be used in regional breeding programs.

中文翻译：

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南部非洲、西部和中部非洲玉米自交系抗轮枝枯萎病菌的遗传

玉米 ( Zea mays L.) 是撒哈拉以南非洲地区人类消费和牲畜饲料的重要作物。玉米的使用通常受到耳腐真菌的限制，其中一些会产生有害的次生代谢物。本研究的目的是确定轮枝镰孢抗性的遗传，作为在人工接种和自然感染下选择对该真菌产生的霉菌毒素伏马菌素等次生代谢物抗性的间接方法。来自 Seed Co 的 12 个近交系用作雌性，使用 North Carolina Design II 与来自国际热带农业研究所 (IITA) 的 12 个用作雄性的测试系交配。结果 144 F ₁在津巴布韦对杂交种和六种检查杂交种进行了评估。第一季在 Rattray Arnold 研究站进行了F. verticillioides的人工接种。F. verticillioides发病率的一般 (GCA) 和特定结合能力 (SCA) 效应在生产线和测试者的不同地点之间存在差异。六个南部非洲自交系对F. verticillioides穗腐病具有理想的 GCA，可用作抗性来源。鉴定了来自 IITA 的优秀测试人员，他们的F. verticillioides耳腐病和伏马菌素的 GCA 均为阴性。加性和非加性效应都与F. verticillioides引起的穗腐病的抗性有关并确定了可用于区域育种计划的潜在品系。