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Nicotiana Tabacum Breeding Lines Resistant To Various Root-Knot Nematodes (Meloidogyne Spp)

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image of Nematologica
For more content, see Nematology.

The smallest differences in susceptibility to Meloidogyne javanica of the Nicotiana tabacum breeding stock R83 and N.C.95 resistant to Meloidogyne incognita races 1 and 3 were used to establish a family of breeding lines with resistance to M. incognita races 2 and 4 and moderate resistance to M. javanica. By single plant selection in every stock through seven generations and finally combining morphologically similar responding plasms, two lines resistant to either race 2 or race 4 and 14 lines resistant to races 2 and 4 were produced. To improve the quality of these breeding lines, crosses were made with accepted cultivars, Delcrest 202, Hicks, Hicks 76 and TL 33. The root-knot resistance was selected in the glasshouse and tested under field conditions by planting at four locations with naturally occurring nematode populations. The quality of these breeding lines approximates that of Hicks and they can be further utilized in breeding programs as sources of resistance.

Affiliations: 1: Senior Plant breeder and Senior Pathologist respectively, Tobacco and Cotton Research Institute, Private Bag X82075, Rustenburg 0300, Republic of South Africa


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