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Published in Crop Sci 16:199-201 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Heritability of Soluble Proteins in Alfalfa1

L. H. Gutek, B. P. Goplen2 and R. E. Howarth3

This study was conducted to assess the feasibility of breeding alfalfa cultivars with low soluble protein concentrations as a means of reducing the bloat-causing potential of alfalfa (Medicago sativa L.). Narrow-sense heritability estimates were obtained for soluble fraction I, fraction II, and total soluble protein concentrations in alfalfa. Heritability estimates (h2) were based on the parent-offspring regression method using data from 32 unselected clones and their open-pollination progenies.

The h2 estimates for the soluble proteins for 1972 and 1973 were as follows: soluble fraction I (19 and 20%), soluble fraction II (19 and 27%), total soluble protein (23 and 31%). These relatively low heritability estimates indicate that it should be possible to lower the soluble protein content of alfalfa by consecutive cycles of recurrent selection procedures involving well-replicated progeny tests.

Key Words: Soluble protein • Fraction I protein • Fraction II protein • Heritability • Environmental variance • Ruminant bloat • Medicago sativa L.

1 Part of a thesis submitted by the senior author to the College of Graduate Studies, Uuiversity of Saskatchewan, in partial fulfilment of the requireinetlts for the M.S. degree.

2 Research Station, Agriculture Canada, Saskatoon, Saskatchewan, S7N 0X2.

3 Research Station, Agriculture Canada, Saskatoon, Saskatchewan, S7N 0X2.

Received for publication February 20, 1975.




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