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Title: RESISTANCE TO MELOIDOGYNE INCOGNITA RACE 3 AND ROTYLENCHULUS RENIFORMIS IN WILD ACCESSIONS OF GOSSYPIUM HIRSUTUM AND G. BARBADENSE FROM MEXICO

Author
item Robinson, Arin
item Percival Jr, Albert

Submitted to: Annals Of Applied Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/27/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary: Three growth chamber experiments were conducted to screen 46 USDA race stock accessions of Gossypium hirsutum and two of G. barbadense simultaneously for resistance to Meloidogyne incognita race 3 and Rotylenchulus reniformis. Only the G. barbadense accessions (TX-1347 and TX-1348) supported significantly less reproduction by R. reniformis than the susceptible control, Deltapine 16 (accession SA-1186); these accessions were highly susceptible to M. incognita race 3. At least four accessions of G. hirsutum (TX-1174, TX-1440, TX-2976, and TX-2079) had levels of resistance comparable to that of the most resistant wild accession known previously (Wild Mexican Jack Jones = TX-2516). Several other accessions also had significant levels of resistance. However, no accession possessed a level of resistance to Meloidogyne incognita as great as that of Auburn 623 (SA-1492). Most resistant accessions were from the Yucatan peninsular states of Campeche, Quintana Roo, and Yucatan, or the neighboring state of Tabasco.

Technical Abstract: Root-knot and reniform nematodes are serious root parasites of Upland cotton in the United States. More sources of genetic resistance to these parasites are needed. In this study several growth chamber experiments were conducted to evaluate wild accessions of Upland cotton from Mexico for nematode resistance. At least four accessions were found which had levels of resistance to the root-knot nematode as high as the most resistant wild accession known. These genotypes can be used in cotton breeding programs to improve the level and stability of nematode resistance that is available to farmers in commercial cotton varieties.