Cytogenetical Studies of Oryza sativa L. and its Related Species

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Abstract
Chromosomes of O. australiensis are part heterochromatic and part euchromatic; those of O. sativa are mostly euchromatic. In the F1 hybrid O. sativa X O. australiensis there was differential condensation of chromatin of these 2 morphologically different types. Those with part heterochormatin and part euchromatin condensed early starting with pachytene. Those composed of euchromatin only started later but were condensed more completely at ML Thus prior to diakinesis O. australiensis chromosomes were darker staining and 2-4 times the size of O. sativa chromosomes at MI to AI. There were 2 types of bivalents formed at diakinesis in each PMC (pollen mother cell); (a) autosyndetic and (b) allosyndetic. They are true bivalents having generally 1 chiasma or occasionally 2 or more per bivalent.

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