whitefly resistance:
Quoting from Firdaus:
Solanum galapagense is closely related to the cultivated tomato and shows a very good resistance towards whitefly. A segregating population resulting from a cross between the cultivated tomato and a whitefly resistant S. galapagense was created and used for mapping whitefly resistance and related traits, which made it possible to unravel the genetic basis of the resistance. Quantitative trait loci (QTLs) for adult survival co-localized with type IV trichome characteristics (presence, density, gland longevity and gland size). A major QTL (Wf-1) was found for adult survival and trichome characters on Chromosome 2. This QTL explained 54.1% of the variation in adult survival and 81.5% of the occurrence of type IV trichomes. A minor QTL (Wf-2) for adult survival and trichome characters was identified on Chromosome 9. The major QTL was confirmed in F3 populations. Sixteen metabolites segregating in the F2 mapping population were associated with Wf-1 and/or Wf-2. The Wf-1 locus was associated with acyl sugar production. These results show that whitefly resistance in S. galapagense seems to inherit relatively easy compared to whitefly resistance from other sources and offers great prospects for resistance breeding as well as elucidating the underlying molecular mechanism(s) of the resistance.
|