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Pseudo-Self-Compatibility in Red Clover (Trifolium pratense L.)

Pseudo-sclf-coinpatibility (PSC) in normally self-incompatible angiosperms is attributed to environmental, chemical, or genetic causes. Vegetatively propagated clones or randomly selected red clover plants (Trifolium. pratense L.) were subjected to various treatments suggested in the literature as affecting PSC. PSC was a definite clonal characteristic. PSC of 30 of 45 clones tested was greatest at higher temperatures, 32 or 38C. Variation for PSC among world ecotypes ranging in origin from 5° to 69° latitude was limited. PSC was not affected by infection with alfalfa mosaic virus or bean yellow mosaic virus strain 204-1. Applications of 10 ppm of napthalene acetamide or gibberellic acid as foliar and floral sprays did not affect PSC nor did wilting induced by reduction of soil moisture.

Key Words: Bean yellow mosaic virus • Alfalfa mosaic virus • Napthalene acetamide • Gibberellic acid • Ecotype

² Research Agronomist and Agricultural Research Technician, Crops Research Division, Agricultural Research Service, USDA, Beltsville, Md.

Received for publication April 17, 1970.