By Ep Heuvelink
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Extra resources for Tomatoes
7). Many of the resistances are simply inherited, and tomato breeders have had remarkable success in transferring disease-resistance genes into cultivated tomatoes. As a consequence, modern cultivars can carry more than a dozen resistance genes. These resistances can be grouped according to the pathogen groups against which they can protect the crop. VIRUS RESISTANCE ● ● ● ● ● The Tm22 gene for control of the tomato strain (ToMV) of tobacco mosaic virus (TMV) was obtained from L. peruvianum in the 1950s.
2000). correlations are found, the genome is assigned conﬁdence intervals for QTLs that inﬂuence the disease of interest. Alternatively, repeated backcrosses can be made and the progeny are selected for the presence of only one introgression fragment from the donor parents. Such a population of backcross inbred lines (BILs) is very useful, as any difference in phenotype can immediately be linked to the presence of the small introgressions and hence the trait can be mapped (Eshed and Zamir, 1994).
Spontaneous or induced mutants creating unusual phenotypes are © CAB International 2005. Tomatoes (ed. E. Heuvelink) 21 22 P. Lindhout readily detected in self-pollinated species. Such mutants in tomatoes have been carefully documented, preserved and propagated. Most of these will have been caused by recessive point mutations, which are often associated with obvious deviating phenotypes. A large population of deviating phenotypes as observed in a genebank or in the genetic stock of a breeder gives the impression of abundant variation (Rick, 1991).