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Inbreeding in Tetraploid Alsike Clover, Trifolium bybridum L.¹

Inbreeding in tetraploid alsike clover, Trifolium hybridum L, was studied in the S_l, S.₂, S₃, S₄, F₂, F₃, and F₄ generations. In general, highly significant differences were found among progenies within a generation and among generations for persistence, vigor, height, date of flowering, amount of flowering, and growth habit. Inbreeding had a deleterious effect on persistence, vigor, and height. Considerable segregation occurred for date and amount of flowering as several S₃, S₄, and F₄ progenies flowered profusely in the seedling year whereas others did not flower. Correlation coefficients were calculated in all possible combinations among the characters measured.

The vigor of an open-pollination progeny of self-compatible plants was significantly lower than that of the ‘Tetra’ variety in 1963 and 1964. Similar findings were obtained for height in 1963 but not in 1964. These results suggest that sufficient selling occurs in self-compatible plants under open-polllnation conditions to affect the general vigor of the subsequent generation.

Open-pollination progenies of plants selected for persistence were significantly more persistent than nonselected progenies; however, the gain in level of persistence was not of practical value.

Key Words: persistence • growth habit • flowering habit

² Research Geneticist, Crops Research Division, ARS, USDA, and Faculty Affiliate, Department of Agronomy, Colorado State University.

³ Professor of Mathematics and Statistics, Colorado State University.

Received for publication August 23, 1967.