Abstract
A detailed analysis was made on the chromosome pairing at pachytene stage of the inter-specific hybrid of the cross O. sativa×O. officinalis, grown under different temperature conditions (20, 25, 30°C and natural condition).
At diakinesis and metaphase-I, ranges in frequencies of bivalent chromosomes per PMC was 0-11 (mean 0.77) and 0-5 (mean 1.08), respectively.
At diakinesis and metaphase-I, different temperature conditions (20, 25, 30°C and natural condition) had little influence on the formation of bivalent chromosmes.
From the results of pachytene analysis along with all other data, it will be favoured to consider that there exists partial homology between the chromosomes of two species, O. sativa and O. officinalis.
