Abstract
Genetic diversity and differentiation among the B. intermedius accessions of different geographic origin has been studied using isozyme analysis. The mating system was evaluated on the basis of allozyme polymorphism. Outcrossing rate (t) in B. intermedius was mostly 0, except one population with t = 0.16, indicating nearly complete autogamy in this species. Given that B. arvensis and B. intermedius had common allozymes of all isozymes studied, it is suggested that B. intermedius may be a direct autogamous derivative of the outcrosser B. arvensis. Contrary to expectations, the allozyme diversity in B. intermedius was higher than in B. arvensis, 23 and 16 allozymes, respectively. Geographic pattern was found among the accessions of B. intermedius.
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