Species Cross between Phaseolus aureus Roxb. and P. trilobus Ait

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Abstract
Mature hybrids were raised from the cross P. aureus X P. trilobus. Reciprocal combination failed to produce mature pods. The F1 plants resembled one or the other parent in some characters and were intermediate between the 2 parents in others. The F1 plants had an average 30. 7% pollen fertility. Few pods with viable seeds were produced. Structural heterozygosity with regard to duplication, inversion and translocation was noted during analysis of pachytene and later stages of meiosis in F1. Colchicine induced amphidiploid plants had an average 83% pollen fertility and produced many pods with viable seeds. Preferential pairing of chromosomes was observed in meiosis of these plants. The genomic notation AA has been proposed for the 2 parental species.