Abstract

                                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 BC1F1. The pollen of the BC1F1 were utilized for back crossing again with A. hypogaea. The resultant BC1F1 were studied. The complete fertility restoration Iwas 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.

Key words : Groundnut, Triploid, Back cross, Fertility