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Response to Selection for Low Temperature Sprouting Ability in Tomato Populations¹

Selection for low temperature sprouting ability was conducted in field and laboratory environments in parental and F₂ families derived from a six-parent dial lei of tomatoes (Lycopersicon esculentum Mill.). Two cold tolerant (CT) and four non-cold tolerant (NCT) parents were examined. Variation among parental and F₃ progeny selections was partitioned into average effects and into linear and quadratic responses to selection. The results of the selection experiment were compared with expectations based on a previous experiment which involved the parents and F₁ hybrids.

Variation among parents for average effects was highly significant, but no response to selection was observed in families derived from the parents. Average response to selection in the field was significant for families derived from CT x NCT crosses, and there was significant variation among families in this group for the magnitude of response to selection. A response to selection in the field was not observed in families derived from CT x CT or from NCT x NCT crosses. Average response and variability among families for response to selection in the laboratory was significant for each of the family groups, but the greatest response was observed in families derived from CT x NCT crosses.

Observed responses to selection did not always agree with expectations based on diallel analysis of the parents and F₁ hybrids. Some families for which the F₁ analysis indicated a great degree of genetic diversity showed almost no response to selection.

Key Words: Lycopersicon esculentum Mill

² Graduate assistant, Dep. of Horticulture (Current address: P.O. Box 5246, Salinas, CA 93915; research agronomist, UDSA-ARS, U.S. Regional Pasture Research Laboratory and adjunct professor, Dep. of Agronomy; and professor, Dep. of Horticulture (Current address: Bud Antle, Inc., P.O. Box 276, Salinas, CA 93902).

Received for publication August 3, 1981.