Patterns of Molecular Variation in Plant Populations
UNIVERSITY OF CALIFORNIA, DAVIS DAVIS United States
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It has recently been argued 8, 9 that rate of evolution at the molecular level is greater than can be accounted for by natural selection and hence that a large part of observed molecular changes must be selectively neutral. This discussion will be concerned with some experimental results, from studies of a number of different species of plants, that bear on this question. These results will be illustrated here in terms of several representative examples taken from studies of various general enzyme systems in two of the plant species understudy, cultivated barley Hordeum vulgare, and the Slender Wild Oat Avenabarbata.