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A comparison of Selection Methods for Reduced Shattering in Wild Rice¹

Current wild rice (Zizania palustris L.) cultivars are considered to be recessive for a two-complementary-gene system in which complete seed shattering is dominant. The strength of seed retention in these nonshattering cultivars is not adequate to prevent substantial field losses. To test for the existence of quantitative genetic variability above that conditioned by the two-gene qualitative system and to compare selection systems, two forms of selection were conducted in the cultivar Netum. The selection criterion was strength of individual seed retention on plant main-stems at maturity as measured with a hand-held spring operated meter. Two cycles of mass selection in the greenhouse and one cycle of half-sib family selection in the field, both at a 10% selection intensity, produced two populations which were compared to each other and to Netum at Grand Rapids and Excelsior, Minn. Progress from selection for tensile strength was 49.6% for two cycles of mass selection and 15.9% for one cycle of half-sib family selection. Realized heritability estimates for seed retention were 0.58 and 0.55 at the two test locations. Selection for tensile strength had no effect on flowering or maturity date.

Key Words: Quantitative variation • Heritability • Zizania palustris • Zizania aquatica • Tiller maturity

² Former research assistant (now junior scientist, Int. Inst. for Tropical Agric., Oyo Road, P.M.B. 5320, Ibadan, Nigeria) and professor, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108.

Received for publication January 11, 1983.