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Breeding Root-Knot-Resistant Gossypium hirsutum L. Using a Resistant Wild G. barbadense L.¹

Three screening techniques for resistance to the rootknot nematode (Meloidogyne incognita acrita Chitwood & Oteifa 1952) were compared. These were agar, infested soil, and disinfected larvae. The latter was the most effective in differentiating between resistant and susceptible entries.

Using the disinfected larval technique, 173 BC₃F₅ families were screened for resistance. These were from Gossypium hirsutum L. x a wild, root-knot-resistant G. barbadense L., followed by three backcrosses to G. hirsutum. In the order of backcrossing, backcross parents were Z106 (a doubled haploid), var. ‘Empire,’ and var. ‘Auburn 56.’ The first two backcross parents were highly susceptible, and the last was moderately resistant to M. incognita acrita. Pedigree-selection, recurrent-selection, and progeny-testing procedures were followed. Three lines (S3, S22, S28), intermediate in resistance between Auburn 56 and G. barbadense, were developed. These lines represented signficant progress in breeding G. hirsutum with a higher level of resistance to M. incognita acrita than presently grown varieties.

Key Words: Meloidgyne incognita acrita • Intecspecific cross • Backcross • Pedigree selection • Recurrent selection • Screening techniques

² Research Agronomist, USDA, Auburn, AL 36830.

Received for publication March 12, 1974.

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