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United States Department of Agriculture

Agricultural Research Service

Title: New Sources of Nematode Resistance in Wild Accessions of Upland Cotton Frommexico

item Robinson, Arin
item Percival Jr, Albert
item Bridges, Alan

Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: July 23, 1997
Publication Date: N/A

Technical Abstract: Forty-six USDA race stock accessions of Upland cotton (Gossypium hirsutum) and two of G. barbadense were examined for resistance to Meloidogyne incognita race 3 and Rotylenchulus reniformis in environmental growth chamber experiments. Only the G. barbadense accessions (TX-1347 and TX-1348) supported significantly less reproduction by R. reniformis than the susceptible control, Deltapine 16. Both accessions were highly susceptible to M. incognita race 3. The G. hirsutum accessions TX-1174, TX-1440, TX-2076, TX-2079, and TX-2107 had levels of resistance to M. incognita race 3 comparable to that of Wild Mexican Jack Jones, a primary source of resistance in the most resistant breeding lines of G. hirsutum available. No accession was as resistant as the highly resistant line Auburn 623 RNR. Resistant accessions were from the contiguous coastal states of Quintana Roo, Yucatan, Campeche, Tabasco, and Veracruz. Reproduction by R. reniformis populations from Alabama, Mississippi, Louisiana, and Texas, and by M. incognita race 3 populations from Mississippi, Texas, and California did not differ appreciably on resistant genotypes.

Last Modified: 3/4/2015
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