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Timing imbalance in the meiosis of the F1 hybrid Oryza sativa × O. australiensis

Published online by Cambridge University Press:  14 April 2009

S. V. S. Shastry  and
D. R. Ranga Rao
S. V. S. Shastry
Affiliation:
Division of Botany, Indian Agricultural Research Institute, New Delhi, India
D. R. Ranga Rao
Affiliation:
Division of Botany, Indian Agricultural Research Institute, New Delhi, India
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The meiosis in the F1 hybrid Oryza saliva × O. australiensis was studied. Contrary to the observations of Gopalakrishnan (1959), true allosyndetic bivalents were not found at metaphase I. The most frequent associations were non-chiasmatic, end-to-end pseudobivalents. Autosyndetic bivalents were recorded mostly in the complement belonging to O. sativa, which are distinguishable by their smallness and lighter staining. The meiotic cycle exhibits timing imbalance with earlier condensation, and possibly migration, of the univalents belonging to O. australiensis. The data on meiotic pairing in the F1 hybrid and the comparative morphology of O. sativa, O. officinalis and O. australiensis inicate that the last species is the most primitive member, having originated from the pre-Sativa and pre-Officinalis complex.

Type
Research Article
Information
Genetics Research , Volume 2 , Issue 3 , November 1961 , pp. 373 - 383
Copyright
Copyright © Cambridge University Press 1961

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