Evaluation of Nicotiana otophora as a Source of Resistance to Meloidogyne incognita Race 4 for Tobacco
AbstractNo currently available tobacco cultivar possesses resistance to Meloidogyne incognita race 4, nor has any source of resistance been reported within Nicotiana tabacum. The purpose of this study was to evaluate N. otophora acc. La Quinta as a source of resistance to this pathogen. Plants of tobacco cvs. NC 95 and NC 2326, N. otophora La Quinta and N. repanda were inoculated with second-stage juveniles of M. incognita race 4. Gall indices and egg-mass ratings were assessed at 4 and 8 weeks after inoculation. The two N. tabacum cultivars were heavily galled and had numerous egg masses at both rating periods. Nicotiana repanda was only weakly resistant. The galls on this species were very small and present at a low to moderate level; however, egg-mass ratings approaching those of the tobacco cultivars were observed 8 weeks after inoculation. In contrast, low gall indices and egg-mass ratings were found for N. otophora La Quinta at both the 4- and 8-week rating periods. In addition, little variability was observed within this species for either disease rating. Therefore, it appears that the La Quinta accession of N. otophora is a very promising source of M. incognita race 4 resistance for transfer to N. tabacum. Key words: breeding, Meloidogyne incognita race 4, nematode, Nicotiana tabacum, N. otophora, resistance, tobacco.
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