Genetic analysis of pungency and solids in storage onions
Euphytica 82: 1-8, 1995.
Genetic analysis of pungency and soluble solids in long-storage onions *
Philipp W. Simon
Vegetable Crops Research Unit, Agricultural Research Service, U.S. Department of Agriculture,
Department of Horticulture, University of Wisconsin-Madison, Madison, WI 53706 USA
Received 26 June 1994; accepted 12 December 1994
Key words: Allium cepa, diallel, flavor, generation means analysis, pyruvate
Pungency and soluble solids are important quality attributes of onion.
An eight-parent diallel over two years indicated a preponderance of additive
genetic variation for both attributes. Variation among years was significant
for pungency but not solids. No reciprocal cross differences were noted
for pungency or solids. Generation means analysis for four crosses over two years
had a good fit with a simple additive-dominance model to explain the
inheritance of both traits in most cases. Both diallel and generation
means analyses demonstrated some dominance for low pungency. Broad sense
heritability estimates averaged 0.64 for pungency and 0.83 for soluble solids.
Selection was effective for increasing and decreasing pungency in derivatives of five
crosses. Pungency and soluble solids were correlated among parental inbreds
and hybrids but not within F3's. The additive control and
heritability suggest that onion pungency and soluble solids can be effectively
and independently selected.
* The U.S. Government right to retain a
non-exclusive, royalty free licence in and to any copyright is acknowledged.