Diallel analysis of production traits among cultivated, mutant and wild germplasms of Lycopersicon

GUILLERMO RAUL PRATTA; ZORZOLI, R.; PICARDI, L. A.

GENETICS AND MOLECULAR RESEARCH

FUNPEC-EDITORA

Año: 2003 vol. 2 p. 206 - 213

1676-5680

The effects of wild germplasm on tomato fruit shelf life have not been completely evaluated. Three different genotypes of Lycopersicon esculentum (a cultivated variety, a homozygote for nor and a homozygote for rin), LA1385 of L. esculentum var. cerasiforme, LA722 of L. pimpinellifolium, and the 10 diallel hybrids, were assayed. Mean values of fruit shelf life, weight, shape and mean number of flowers per cluster, were analyzed after Griffing (1956, Aust. J. Biology 9: 463-493), method 2, model 1. Both general and specific combining abilities (GCA and SCA) were significant for the four traits. Negative unidirectional dominance was detected for fruit weight and shelf life, while bi-directional dominance was detected for fruit shape and mean number of flowers per cluster. SCA was greater than GCA for shelf life, so that predominantly non-additive effects accounted for this trait. In the heterozygous state, rin had smaller mean effects than nor. Wild accessions were able to prolong shelf life per se and in crosses to the cultivated variety. The cross between the homozygote for nor and LA722 yielded the longest shelf life among hybrids.