Reniform nematode (RN, Rotylenchulus reniformis Linford & Oliveria) is a parasite that reduces and limits cotton (Gossypium hirsutum L.) yields. At present, nematicides and crop rotations are the most effective management tool for producers. Our study investigated the use of six composite breeding lines that have quantitative trait loci (QTLs) for RN resistance and the interaction effect of a nematicide under high RN pressure. The study compared these genotypes in both a non‐RN field and a RN‐infected field under a Velum Total (active ingredients fluopyram and imidacloprid) treatment at Tennessee Valley Research and Extension Center near Belle Mina, AL. In both years, the breeding lines outyielded commercial controls and the parental lines in RN infested field with and without Velum Total. Five out of the six breeding lines contained both chromosome 21 (Ren^barb1 and Ren^barb2) resistant QTLs, which reduced RN egg numbers (P < .05) and produced higher yields than the commercial checks. These lines can be considered moderately resistant to RN. The remaining line contained one QTL Ren^barb1, produced good yield, and is considered tolerant, despite the fact that it had high RN egg numbers. However, adding a nematicide treatment did increase yields in all material tested. Therefore, further work at increasing resistance from other genetic sources is needed to completely eliminate nematicide use.

中文翻译：

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棉状线虫抗性变化对棉花基因型的杀线虫反应

肾形线虫（RN，Rotylenchulus reniformis Linford＆Oliveria）是一种减少和限制棉花（陆地棉）的寄生虫L.）产量。目前，杀线虫剂和作物轮作是生产者最有效的管理工具。我们的研究调查了六个具有定量性状位点（QTL）的复合育种品系对RN的抗性以及在高RN压力下杀线虫剂的相互作用。该研究在美国田纳西州谷研究和推广中心附近的田纳西河谷研究和推广中心的Velum Total（活性成分氟吡草胺和吡虫啉）处理下，在非RN田地和RN感染的田地中比较了这些基因型。在这两年中，在有和没有Velum Total的情况下，在RN出没的田中，育种系的产量都超过了商业对照，而亲本系的产量超过了对照。6个育种系中有5个同时包含21号染色体（Ren ^barb1和Ren ^barb2）抗性QTL，可减少RN卵的数量（P  <.05），并比商业检测获得更高的产量。这些细胞系可以被认为对RN具有中等抵抗力。其余品系包含一个QTL Ren ^barb1，产量高，尽管其RN卵数高，但仍被认为是可以耐受的。但是，添加杀线虫剂处理确实提高了所有测试材料的收率。因此，需要进一步的工作以增加对其他遗传资源的抗性，以完全消除杀线虫剂的使用。