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Cytogenetics of Crotalaria VI. Chiasma frequency and position, and univalent behaviour in a (partially) asynaptic mutants of C. juncea

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Abstract

In Crotalaria juncea (n=8) a plant exhibiting partial asynapsis was isolated in the M1 of a combined treatment of 50 kR gamma rays +0.2% EMS. The majority (48.14%) of PMCs at diplotene, diakinesis and metaphase I had 16 univalents. The bivalents in the asynaptic mutant were always rod-shaped with one terminal chiasma. In comparison, controls had on the average 7.08 ring bivalents. The asynapsis is genetically controlled, monofactorially recessive, and it is concluded that chromosome pairing is interrupted at a very early stage. There is a possible correlation between the number of bivalents and the arrangement of the univalents at metaphase I. When there were less than four bivalents, the univalents tended to be polar, and when there were more than four, the univalents were more equatorial in arrangement. The arrangement of univalents was random and apparently not influenced by the bivalents, when their number (4) was exactly half the zygotic number.

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Authors and Affiliations

  1. Cytogenetics Laboratory, Department of Botany, University of Jodhpur, 342001, Jodhpur, India

    B. C. Verma & S. N. Raina

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  1. B. C. Verma
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  2. S. N. Raina
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Verma, B.C., Raina, S.N. Cytogenetics of Crotalaria VI. Chiasma frequency and position, and univalent behaviour in a (partially) asynaptic mutants of C. juncea . Genetica 58, 65–70 (1982). https://doi.org/10.1007/BF00056005

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  • DOI: https://doi.org/10.1007/BF00056005

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