BREEDING AND GENETICS Inheritance of Root-knot Nematode Resistance in M-315 RNR and M78-RNR Cotton

The southern root-knot nematode (RKN) [Meloidogyne incognita (Kofoid & White)] is a serious pest of cotton (Gossypium hirsutum L.) with detrimental effects being most pronounced on sandy soils that are also infested with the Fusarium wilt pathogen. Varietal resistance is an effective method of managing the RKN/Fu-sarium wilt complex. In 1970, a high level of RKN resistance was developed in the germplasm line Auburn 623 RNR, but no commercial cultivar has been developed with this near-immunity level of resistance. The objective of this study was to eval-uate the mode of inheritance of RKN resistance in M-315 RNR (M-315), a germplasm line wit