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Recurring Hybrid Formation in a Population of Polystichum x potteri: Evidence from Chloroplast DNA Comparisons
Diana B. Stein and David S. Barrington
Annals of the Missouri Botanical Garden
Vol. 77, No. 2 (1990), pp. 334-339
Published by: Missouri Botanical Garden Press
Stable URL: http://www.jstor.org/stable/2399548
Page Count: 6
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The origins of a population of the hybrid fern Polystichum x potteri (P. acrostichoides x P. braunii) were explored through an examination of restriction fragment length polymorphisms in chloroplast DNA. We demonstrate that the hybrid individuals in this population each had one of the two possible parental chloroplast genomes. This result documented recurrent hybridization in the population, whereas isozymes and morphological data did not. As expected, the hybrids combined the length polymorphisms in ribosomal DNA detected in each parent. We suggest that inferences from chloroplast DNA data about evolution in lineages rich in hybrid species can be biased by inheritance of two chloroplast genomes in three or more different descendants of a paleopolyploid species.
Annals of the Missouri Botanical Garden © 1990 Missouri Botanical Garden Press