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ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #223962
Title: Effect of Meloidogyne incognita resistance genes in cotton on the reproduction of M. mayaguensis

Author
item BRITO, J - FL DEPT OF AGRIC
item KAUR, R - UNIV OF FL
item Davis, Richard
item DICKSON, D - UNIV OF FL

Submitted to: International Congress of Nematology
Publication Type: Proceedings
Publication Acceptance Date: 4/1/2008
Publication Date: 7/24/2008
Citation: Brito, J.A.; Kaur, R.; Davis, R.F.; Dickson, D.W. 2008. Effect of Meloidogyne incognita resistance genes in cotton on the reproduction of M. mayaguensis. Proceedings of the Fifth International Congress of Nematology, Brisbane, Australia, July 13-18, 2008:234.

Interpretive Summary:

Technical Abstract: Meloidogyne mayaguensis was first reported in the continental United States in 2002, and some isolates can reproduce on cotton. Meloidogyne incognita is the single most important pathogen of cotton in the United States, and efforts to incorporate resistance to M. incognita into cotton cultivars are ongoing. Our objective was to determine whether resistance to M. incognita in cotton will also confer resistance to M. mayaguensis. Two greenhouse experiments showed that gall and egg mass indices, eggs per gram of root, and reproductive factor (Rf) differed significantly among cotton genotypes resistant or susceptible to M. incognita when inoculated with M. incognita, but not when inoculated with M. mayaguensis. Results indicated that resistance to M. incognita in cotton does not confer resistance to M. mayaguensis; however, on cotton susceptible to M. incognita, inoculation with M. mayaguensis resulted in gall and egg mass indices, eggs per gram of root, and Rf less than on plants inoculated with the same number of M. incognita. On cotton resistant to M. incognita, the two nematode species reproduced similarly.