Genetic Analysis of Fruit Length Using Mixed Major Gene Plus Polygenes Inheritance Model in Lycopersicon esculentum var. cerasiforme Alef.

W403(a round-shaped) and W405(a pear-shaped var.cerasiforme) were employed to establish six genealogical pop-ulations(P1,F1,P2,B1,B2 and F2).The Fruit length of the populations were analyzed by means of classic genetics and the ma-jor gene + polygene mixed inheritance model of quantitative traits;The analysis indicated that the Fruit length in W403 was controlled by a recessive major gene and the inheritance of the Fruit length fitted one major gene plus polygene model.Heri-tability values of the major genes of B1,B2 and F2 population were estimated as 0%,19.94% and 26.67% respectively,while those polygene were 70.20%,54.73% and 48.78%.These results indicated that major gene in F2 was a key factor and environ-ment factor was also relatively important.This implies that in the genetic improvement of Fruit length major gene is a main fac-tor whereas environmental effect should be taken care of.