Gene Action For Yield Contributing Character In Bottle Gourd

A study of the attributes for yield components of 21 F1 ’s and their seven parents in 7 x 7 diallel (excluding reciprocals) of bottle gourd [Lagenaria siceraria (Mol.) Standl.] was conducted at the Olericulture Division of Horticulture Research Centre, Bangladesh Agricultural Research Institute (BARI), Gazipur, Bangladesh during 2018-19. The graphical and the component of variance analysis revealed that non-additive gene action were dominant in all the characters studied. But the average degree of dominance was over dominance in the inheritance of maximum traits in except fruit length, fruit diameter, endocarp thickness showed the partial dominance for the genes controlling these characters. The values of the ratio of number of total dominant and recessive gene estimated were one or more than one for most of the characters except fruit length and fruits number per plant indicating the asymmetrical distribution of dominant and recessive alleles in the parents for the eight characters and an excess of dominant gene is indicated. Broad sense heritability was higher heritability for all the parameters but in narrow sense heritability were higher heritability for fruit length, fruit diameter, endocarp thickness indicating their high heritable control nature. The Wr/Vr graphs showed dominance effect of gene was observed in maximum characters. The graphical analysis indicated wide genetic diversity among the parents.