Abstract
The stable telocentric B-chromosomes of Hypochoeris maculata show an overall accumulation through the egg but a loss through the pollen. When crosses involve a single Bt the joint transmission gives an accumulation of 8%. The individual crosses, however, show great heterogeneity. Transmission through the megaspore ranged from 0.287 to 1.037 per B while pollen transmission was much less variable (0.360 to 0.560 per B) and close to the expected value. There is no intraplant correlation between pollen and egg transmission. Crosses repeated in different years show a clear positive correlation through the egg but no correlation through the pollen indicating that some B-transmission variation is of environmental origin. Despite this discrepancy, the outcome of crosses between plants of known transmission rate can be predicted. Stability of the A-chromosome complement is clearly reduced by the presence of B-chromosomes.
Published Version
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