Registration of TAM RKRNR‐9 and TAM RKRNR‐12 Germplasm Lines of Upland Cotton Resistant to Reniform and Root‐Knot Nematodes

TAM RKRNR‐9 (Reg. No. GP‐941; PI 662039) and TAM RKRNR‐12 (Reg. No. CP‐942; PI 662040) with resistance to the reniform ( Rotylenchulus reniformis Linford & Oliveira) and root‐knot [ Meloidogyne incognita (Kofoid & White) Chitwood] nematodes are noncommercial breeding lines of upland cotton ( Gossypium hirsutum L.) released by Texas AgriLife Research in 2010. Both lines were derived from the cross of the root‐knot nematode resistant line M‐315 RNR ( G. hirsutum L.), and the reniform nematode resistant line Tx110 ( G. barbadense L.). The resistance to reniform is moderate, suppressing nematode reproduction by 40–70%. The resistance to root‐knot nematodes is high, similar to that of the M‐315 RNR parent, with more than 90% suppression of reproduction and low amounts of root galling. This unique combination of resistance to the reniform and root‐knot nematodes makes these breeding lines valuable for cotton‐breeding programs.