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United States Department of Agriculture

Agricultural Research Service

Simon: Pubs: 98tag_0960
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Theor Appl Genet (1998) 97: 960-967

J. M. Bradeen . P. W. Simon

Conversion of an AFLP fragment linked to the carrot Y2 locus to a simple, codominant, PCR-based marker form

Received: 16 February 1998 / Accepted: 7 April 1998

Abstract  Recent advances have expanded the potential usefulness of molecular techniques for plant genetic research. AFLP is a powerful technique, allowing rapid and reliable analysis of multiple, potentially polymorphic sites in a single experiment. Because AFLP technology requires no a priori knowledge of genome structure or preparation of molecular probes, it is immediately useful for a wide variety of plant species. However, because AFLP markers are dominant, costly, and technologically demanding, the technique has limited application for large-scale, locus-specific uses. In carrot, the Y2 locus controls carotene accumulation in the root xylem core. Although carrot is an important source of dietary carotene, little is known about the regulation and biosynthesis of carotenes in carrot. We identified six AFLP fragments linked to the Y2 locus through a combination of F2 mapping and bulked segregant analysis. We have developed a procedure for generating simple, codominant, PCR-based markers from dominant AFLP fragments using a Y2-linked AFLP fragment as a model. Our converted marker requires only a simple PCR followed by standard agarose gel electrophoresis. It is rapid, simple, reliable, comparatively inexpensive, codominant, and non-radioactive. Conversion of AFLP fragments to forms better adapted to large-scale, locus-specific applications greatly expands the usefulness of this molecular technique.

Key words  AFLP . Bulked segregant analysis . Daucus carota . Inverse PCR . Marker conversion


Communicated by G. Wenzel

J. M. Bradeen . P. W. Simon (envelope)
USDA-ARS Vegetable Crops Research Unit and Department of
Horticulture, University of Wisconsin-Madison,
1575 Linden Dr., Madison, WI 53706, USA
E-mail: psimon@facstaff.wisc.edu
Fax: +1-608-262-4743



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