Breeding behaviour of triploids in back crosses with Arachis hypogaea

摘要

The diploid (2n=20) wild species of Arachis are the potential sources of resistance to many pests and diseases. The diploid wild sp. A. cardenasii was hybridized with CV. VRI 2 of A. hypogaea (2n=40). The resultant triploids (2n=30) were partially fertile. The pollen of the triploids were utilised for back crossing again with A. hypogaea. There were three distinct form of plants obtained in BC_1F_l. The pollen of the BC_1F_1 were utilized for back crossing again with A. hypogaea. The resultant BC_2F_1 were studied. The complete fertility restoration wag observed in form I in the immediate back cross, whereas it was observed in the second back cross in form II. Hence, triploids is also a potential source for genetic introgression in groundnut.