Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: January 7, 2010
Publication Date: N/A
Technical Abstract: Reniform nematode (Rotylenchulus reniformis) has emerged as a significant threat to cotton (Gossypium hirsutum) throughout much of the U.S. cotton production region. Host plant resistance is a goal for control of this pest; the use of G. barbadense accession 713 (GB 713) in breeding for reniform nematode resistance by three ARS programs at College Station, TX, Mississippi State, MS, and Stoneville, MS is reviewed. In 2004, GB 713 was identified as sustaining a nematode population that was only 3% of that of the susceptible DP 16 G. hirsutum cultivar. This resistance was confirmed in field tests in four states; greatest suppression of the nematode occurred in MS, and the lowest suppression occurred in TX. Robinson initiated attempts to combine resistance to reniform nematode with resistance to root-knot nematode (Meloidogyne incognita) by crossing GB 713 with either NemX or M 315. A bulk segregant analysis indicated the resistance to reniform nematode in GB 713 was controlled by a single dominant gene with additive effects. Three SSR markers may be linked to this gene. At College Station, resistance was identified as residing on the long arm of chromosome 21 in a region between BNL 3279 and CIR 316. A generation mean analysis conducted at Mississippi State on phenotypic data supplied by Robinson indicated one gene with partial dominance for reniform nematode resistance. Ninety-five lines from 13 populations of GB 713 back-crossed to NemX and M 315 or LA 887were grown at Stoneville. Selections were crossed to adapted Mid South breeding lines.