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ARS Home » Midwest Area » Madison, Wisconsin » Vegetable Crops Research » Research » Publications at this Location » Publication #137359
Title: DEPLOYMENT OF MOLECULAR MARKERS FOR MULTI-TRAIT SELECTION IN CUCUMBER

Author
item ROBBINS, MATHEW - UNIV OF WISCONSIN
item Staub, Jack
item FAZIO, GENNARO - UNIV OF WISCONSIN

Submitted to: Cucurbitaceae Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 9/15/2002
Publication Date: 12/8/2002
Citation: Robbins, M.D., Staub, J.E., Fazio, G. 2002. Deployment of molecular markers for multi-trait selection in cucumber. Cucurbitaceae Proceedings.

Interpretive Summary:

Technical Abstract: Multi-trait selection of quantitatively inherited traits/loci (QTL) is an important objective in cucumber breeding programs. Some impediments to multi-trait marker assisted selection (MAS) (i.e., source/sink relationships) and the theoretical basis and strategy for overcoming such impediments are presented. A QTL analysis was accomplished in which 171 recombinant inbred lines (RIL) were evaluated and QTL for earliness (days to first harvest), days to anthesis, sex expression, multiple lateral branching (MLB), and fruit length (length:diameter ratio, L:D) were placed on a genetic linkage map consisting of 131 markers of various types. Results suggest there are strong negative and positive correlations between the traits evaluated. Many of the QTL associated with the traits were placed on Linkage Groups 1 and 6. The map position of QTL and correlations among four traits were considered for the development of a breeding strategy for multi-trait selection of high-yielding germplasm. This recurrent selection strategy is described, and a plan for the evaluation of its efficacy is accomplished by comparing MAS with phenotypic selection.