Genetic Components of Variance for Winter Injury, Fall Growth Cessation, and Off-season Flowering in Blueberry Progenies

in Journal of the American Society for Horticultural Science
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  • 1 Department of Horticultural Science and Landscape Architecture, University of Minnesota, St. Paul, MN 55108
  • | 2 Department of Horticulture Science, University of Saskatchewan, Saskatoon, Saskatchewan Canada S7N 0W0


Genetic variance components, narrow sense heritability, and combining ability effects of parents were determined for several traits from analysis of a partial diallel cross involving 17 parents. Parents included several Vaccinium species and interspecific hybrids. For fall growth cessation, general combining ability (GCA) effects were variable from year to year, and heritability was low. Variance due to GCA was more important than specific combining ability (SCA) variance for winter injury in each of the years. The heritability estimate over years was low for winter injury, although individual year estimates were higher. Lowbush parents had high GCA effects for winter injury in years with snow cover but low estimates for years without snow cover. Off-season flowering was observed in some progenies in both years studied. Certain V. angustifolium Ait. parents had high GCA effects for the occurrence of off-season flowering. The heritability estimate for off-season flowering in combined years was 0.47. Variation due to years and to GCA × year interaction was significant for all characters studied.

Contributor Notes

Former Research Assistant. Present address: Dept. of Horticulture, Iowa State Univ., Ames, IA 50011.


Assistant Professor.

Professor. Dept. of Agronomy and Plant Genetics.

Received for publication 19 Mar. 1984. Scientific Journal Series Paper No. 13,835. Minn. Agr. Expt. Sta., St. Paul. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.