Melvin D. Epp

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A nuclear gene mutation in Oenothera hookeri increases the frequency of variegated sectors. The gene is recessive; the variegation is cytoplasmically transmitted. Once variegation is induced, the mutant gene is not required for its continued expression. The induced sectors may differ one from another. The gene expresses unique patterns of penetrance and of(More)
OBJECTIVES To evaluate possible changes in USDA nutrient content data for 43 garden crops between 1950 and 1999 and consider their potential causes. METHODS We compare USDA nutrient content data published in 1950 and 1999 for 13 nutrients and water in 43 garden crops, mostly vegetables. After adjusting for differences in moisture content, we calculate(More)
Ferulate esters of normal C22–C30 alcohols were found in the root extract ofKalanchöe daigremontiana and the freen-C30 alcohol, triacontanol, was found on the leaves. Ferulic acid was isolated from the vermiculite in which plants were grown. Whole plant and tissue culture experiments were done to investigate the role of ferulic acid as an allelochemical and(More)
Recently, Lindenhahn et al. (1985) hypothesized that the plastome mutator (pm) system in Oenothera originated through contaiminating cross-pollination and that the variegation was an example of hybrid plastome-genome incompatibility. Their evidence was based on restriction pattern analyses of white sectors which showed wild-type plastome III patterns rather(More)
The effects of plastid mutations on seed oil content and fatty acid composition are of considerable interest. Seeds of a number of plastome mutants produced by thepm plastome mutator line ofOenothera hookeri were therefore harvested to investigate these effects. The mutants were altered solely in their plastome: each seed lot had the same nuclear(More)
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