Breeding for reniform nematode (Rotylenchulus reniformis) resistance is hindered by the lack of resistance in upland cotton (Gossypium hirsutum) cultivars. Resistance has been frequently identified in accessions from the Gossypium arboreum germplasm collection with accession PI 529740 rated as highly resistant. Accession PI 529740 was crossed with the susceptible G. arboreum accession PI 529729 to develop an F₂ population for genetic characterization. The population showed quantitative variation suggesting multiple genes conferred the resistant phenotype. Thirteen of the 216 F₂ plants showed resistance similar to the resistant parent and these data supported a two recessive gene model. Sixty plants were classified as resistant or moderately resistant, indicating a single recessive gene conferred the moderately resistant phenotype. The classification of 24 F_2:3 families for nematode resistance generally supported the classification of the corresponding F₂ plants; however, most families were highly variable for infection with no families rated as resistant. This information will aid in the introgression of resistance into upland cotton as larger populations will be required to successfully recover resistance conferred by multiple recessive genes.

中文翻译：

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棉状体棉PI 529740的抗肾形线虫遗传特性

陆地棉（Gossypium hirsutum）品种缺乏抗性，阻碍了对肾形线虫（Rotylenchulus reniformis）的育种。人们经常在棉树种质收集品中鉴定出抗药性，其中品号为PI 529740的抗药性高。保藏号PI 529740与易感G杂交。 亚洲棉加入PI 529729制定一个F ₂群体的遗传特征。种群显示出定量变异，表明多个基因赋予了抗性表型。216座F _2中的13座植物显示出与抗性亲本相似的抗性，这些数据支持了两个隐性基因模型。60株植物被归为抗性或中度抗性，表明单个隐性基因赋予了中度抗性表型。线虫抗性的24个F _2：3家族的分类通常支持相应F ₂植物的分类。但是，大多数家庭的感染情况差异很大，没有任何家庭被定为抗药性。这些信息将有助于将抗性渗入陆地棉，因为需要大量的种群才能成功恢复由多个隐性基因赋予的抗性。