Registration of eight germplasm lines of upland cotton (Gossypium hirsutum L.) resistant to reniform nematodes (Rotylenchulus reniformis) with elite agronomic performance

Abstract

AbstractCotton (Gossypium hirsutum L.) germplasm lines BARBREN‐713‐8 (Reg. no. GP‐1138, PI 701080), BARBREN‐713‐11 (Reg. no. GP‐1131, PI 701073), BARBREN‐713‐13 (Reg. no. GP‐1132, PI 701074), BARBREN‐713‐25 (Reg. no. GP‐1133, PI 701075), BARBREN‐713‐32 (Reg. no. GP‐1134, PI 701076), BARBREN‐713‐33 (Reg. no. GP‐1135, PI 701077), BARBREN‐713‐41 (Reg. no. GP‐1136, PI 701078), and BARBREN‐713‐48 (Reg. no. GP‐1137, PI 701079) were developed and released by the USDA‐ARS, Texas A&M AgriLife Research, and Cotton Incorporated in 2014. The objective of the release was to provide breeders with agronomically elite germplasm that is resistant to reniform nematode (Rotylenchulus reniformis). Four lines (BARBREN‐713‐8, ‐32, ‐33, and ‐48) also have simple sequence repeat (SSR) DNA markers for the Mi‐1 or Mi‐2 gene for resistance to root‐knot nematode [Meloidogyne incognita (Kolfoid & White) Chitwood]. The lines have excellent seedling vigor in fields infested with both nematodes and fungal root‐rot pathogens. Resistance to reniform nematode was transferred from G. barbadense GB713 (PI 608139) and is associated primarily with the Ren2GB713 gene on chromosome 21. This gene could be detected with the codominant SSR marker BNL3279_105 or the single nucleotide polymorphism marker GI‐187401. In controlled environment assays, these lines reported here suppressed numbers of reniform nematode eggs by 74–92% compared with ‘FiberMax FM966’. The lines outyielded and had fiber quality equal to or greater than several commercial cultivars.