Biochemical Methods by Pingoud

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Two hp mutants are recessive mutations in two different genes that show elevated levels of lycopene as well as ß-carotene and which accompany a general elevated level of chlorophyll. , 1997). , 1999). g colour, flavour and soluble solids content). Another factor that is especially important for fresh-market tomatoes is the shelf-life. During ripening, several processes occur that affect the storage of the fruit negatively. Some genes involved in ripening, such as polygalactoronidase and ethylene synthase, have been cloned and transgenic tomatoes overexpressing these genes have an extended shelf-life.

The top three rows are L. esculentum cultivars. The bottom row represents some wild species. (a) (b) Fig. 2. Some wild Lycopersicon species: (a) L. pimpinellifolium; (b) L. parviflorum. In conclusion, there is limited genetic variation in tomato itself but considerable genetic variation among and within the wild Lycopersicon spp. that can be exploited, with varying degrees of difficulty, for crop improvement. Breeders would naturally use the sources closest to tomato, for ease, efficiency and rapidity of the transfer.

Hirsutum that gives a less intense colour, and another QTL has been observed that is involved in more intense red coloration. This has also been observed for traits involved in yield. Wild species with smaller fruits might carry QTLs that give rise to increased fruit size when crossed to tomato, as has been observed for L. pimpinellifolium, L. peruvianum and L. pennellii. QTLs that increase soluble solid contents (°Brix) have been found in all four of the above wild species, as well as QTLs increasing total yield.

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