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New sources of resistance to root knot nematodes meloidogyne incognita among primitive cottons gossypium hirsutum






Crop Science 23(5): 999-1002

New sources of resistance to root knot nematodes meloidogyne incognita among primitive cottons gossypium hirsutum

Presently, Auburn 634 RNR and related cottons are the only germplasm in upland cotton (G. hirsutum L.) with extremely high resistance to root-knot nematodes (RKN) [M. incognita (Kofoid and White) Chitwood]. Genetic vulnerability could result from using only this 1 source for breeding resistant cultivars. Primitive race stocks were evaluated of G. hirsutum to identify new, genetically diverse sources of RKN resistance, and to compare the new sources with those now in upland cottons. Of 471 primitive race stocks evaluated, 18 (3.8%) were resistant. None were as resistant as Auburn 634 RNR, although several approached it. Number of eggs produced on the 8 race stocks having the highest resistance ranged from 2.8-5.5 times fewer than were used initially to inoculate them. Resistance was widely distributed among stocks of different races (originating from the same and different geographic areas), indicating the potential diversity of the resistant germplasm. Apparently, RKN resistance should be relatively stable over time and should control RKN across many geographic regions of the world.


Accession: 005980500



Related references

Starr J.L.; Veech J.A., 1986: Susceptibility to root knot nematodes meloidogyne incognita in cotton gossypium hirsutum lines resistant to the fusarium wilt root knot complex. The cotton (Gossypium hirsutum L.) breeding lines CABCS'-1-81, CAHUS-2-81, and LEBOCAS'-3-81, developed by the multiple adversity resistance (MAR) technique, have been reported to be resistant to the fusarium wilt [Fusarium oxysporum Sch...

Robinson, A.; Bridges, A.; Percival, A., 2004: New sources of resistance to the reniform (Rotylenchulus reniformis) and root-knot (Meloidogyne incognita) nematode in upland (Gossypium hirsutum L.) and Sea Island (G. barbadense L.) cotton. The reniform nematode (Rotylenchulus reniformis Linford & Oliveira) is an important problem in U.S. cotton, and all cultivars support high R. reniformis populations. The objectives of this research were to find better sources of resistance to R. r...

Shepherd, R.L., 1983: New sources of resistance to root-knot nematodes among primitive cottons. In a greenhouse study with plants grown in pots containing soil inoculated with Meloidogyne incognita, 471 primitive geographic race stocks of Gossypium hirsutum were evaluated and 18 (3.8%) were found to be resistant. None was as resistant as Aub...

Jain, R.K., 2003: Screening of cotton (Gossypium hirsutum) genotypes for resistance against root-knot nematode (Meloidogyne incognita race-4). Fifty cotton genotypes were screened for resistance against M. incognita in pot experiments. Six were resistant, 2 were moderately resistant, 1 was susceptible and rest of the genotypes were highly susceptible.

Wubben, M.J.; Callahan, F.E.; Jenkins, J.N.; Deng, D.D., 2016: Coupling of MIC-3 overexpression with the chromosomes 11 and 14 root-knot nematode (RKN) (Meloidogyne incognita) resistance QTLs provides insights into the regulation of the RKN resistance response in Upland cotton (Gossypium hirsutum). Tag. Theoretical and Applied Genetics. Theoretische und Angewandte Genetik 129(9): 1759-1767

Hedin P.A.; Shepherd R.L.; Kappelman A.J.Jr, 1984: Evaluation of cotton gossypium hirsutum poly phenols as factors of resistance to root knot nematode meloidogyne incognita and fusarium wilt. The terpenoid aldehyde content of cotton roots of a root-knot nematode resistant strain (A623) was higher initially and increased faster after inoculation than that of a susceptible strain (M-8). The presence of gossypol and 5 other terpenoid alde...

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