Abstract
Abstract Malate dehydrogenase (MDH) isozyme variability in peach [Prunus persica (L.) Batsch.] cultivars allowed estimation of outcrossing. After correction for undetectable pollen (of the same genotype as the homozygous Mdh-aa female parents), mean rates of outcrossing of 33% in 1984 and 15% in 1985 were observed. Although no significant cultivar or season effects were observed, a large amount of random variation was present, probably due to uncontrolled variables, such as pollinator behavior and weather conditions. Differences in floral morphology (showy vs. nonshowy flowers, flower color, and petal shape) did not influence rates of outcrossing. Chemical name used: L-Malate:NAD+ oxidoreductase (EC 1.1.1.37, malate dehydrogenase).
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