Abstract
All the eleven pachytene chromosomes of A. scarabaeoides were identified on the basis of their relative length, arm ratio, chromomere pattern and nucleolar association. The pachytene complement of A. scarabaeoides consists of one median, 9 submedian and one subterminal chromosomes. On the basis of direct comparison of parental pachytene chromosomes, 7 chromosomes are common to A. scarabaeoides and C. cajan. In 8 bivalents of the hybrid the homoeologues participating in pairing were identified. Out of these 8, one bivalent showed non-homologous association and 4 were found to be heteromorphic. Two translocations and an interstitial duplication were noticed in a few microsporocytes. On the basis of the common chromosomes involved in translocations and those exhibiting heteromorphism in the 2 hybrids, C. cajan×A. sericea and C. cajan×A. scarabaeoides but not in the C. cajan×A. lineata hybrid it is concluded that A. sericea and A. scarabaeoides are closer to each other than either of them to A. lineata.
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