Linkage between genes for resistance to downy mildew (Bremia lactucae) in lettuce |
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| Authors: | JUDITH M NORWOOD I R CRUTE |
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| Institution: | National Vegetable Research Station, Wellesbourne, Warwick CV35 9EF |
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| Abstract: | Data are presented for the joint segregation of the gene combinations: Dm-2/Dm-3, Dm-3/Dm-6, Dm-2/Dm-6 and Dm-6/Dm-8, following inoculation with five races of B. lactucae. It is postulated that Dm-2, 3 and 6 comprise a tight linkage group but that Dm-6 and Dm-8 are not linked as has been proposed previously. Information on the reaction of some resistant lettuce cultivars to certain B. lactucae races and some new postulated host genotypes is also presented. |
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