Submitted to: Plant Genome Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 12/12/2000
Publication Date: N/A
Citation: Interpretive Summary:
Technical Abstract: Important characteristics for the bulb onion include solids, flavor, and potential health benefits. Solid content is related to onion flavor, texture and storability and has practical importance for the dehydration industry. Among the salutary effects of onion on the cardiovascular system is the inhibition of platelet aggregation. Platelets play a key role in thrombosis and acute coronary syndromes because they facilitate blood coagulation. Pungency is an important commercial trait as consumers often prefer lower pungency onions. QTL controlling pungency, total solids, soluble solids, and antiplatelet activity were estimated using 54 F3 families, derived from the cross between Brigham Yellow Globe 15-23( high solids, high pungency and antiplatelet activity) and Ailsa Craig (low solids, low pungency and antiplatelet activity). The families, the parents and controls were evaluated in four environments. There was evidence of transgressive segregation for all traits. Significant correlations among the markers and traits under study were detected. Most of the significant markers were located in two linkage groups (D and E). Markers that were significant for pungency and antiplatelet activity were also significant for solids, suggesting that these characteristics may be controlled by the same chromosome regions. Multilocus models were constructed to determine the most likely number, positions and magnitude of QTL effects.