Abstract
Cytomorphological studies on H. muticus tetrasomics (2n+2=30), isolated from among the selfed progeny of autotriploids, and their diploid (2n=28) counterpart inbred CIMAP/NP-41 were carried out. The overall morphology of both the tetrasomics was similar to that of diploid except reduction in plant height, number of primary branches, pollen fertility and seed set per capsule and increase in leaf area per leaf.The four homologous chromosomes formed either a quadrivalent or two bivalents at diakinesis/metaphase I in majority of the PMCs in both the tetrasomics. Other associations like II+2Is, III+I and rarely 4Is were also observed in decreasing order. The mean frequencies of chromosome associations in terasomics were 0.48 IV, 0.11 III, 13.73 II and 0.27 I. Gametes with variable number of chromosomes ranging between n-1 and n+3 were produced as a result of 3-1 and 2-2 disjunction of quadrivalent. The differences in morphological features, meiotic behaviour, pollen fertility and seed set in the two tetrasomics suggested the involvement of different chromosomes in tetrasomy.
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