Genetics, Vol. 155, 1927-1954, August 2000, Copyright © 2000

Comparative Mapping of Quantitative Trait Loci Sculpting the Curd of Brassica oleracea

Tien-Hung Lana and Andrew H. Patersona,b
a Department of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843
b Department of Crop and Soil Science, Department of Botany and Department of Genetics, Applied Genetic Technology Center, University of Georgia, Athens, Georgia 30602

Corresponding author: Andrew H. Paterson, Plant Genome Mapping Laboratory, University of Georgia, Rm. 162, Riverbend Research Center, 110 Riverbend Rd., Athens, GA 30602., paterson{at}dogwood.botany.uga.edu (E-mail)

Communicating editor: J. A. BIRCHLER

The enlarged inflorescence (curd) of cauliflower and broccoli provide not only a popular vegetable for human consumption, but also a unique opportunity for scientists who seek to understand the genetic basis of plant growth and development. By the comparison of quantitative trait loci (QTL) maps constructed from three different F2 populations, we identified a total of 86 QTL that control eight curd-related traits in Brassica oleracea. The 86 QTL may reflect allelic variation in as few as 67 different genetic loci and 54 ancestral genes. Although the locations of QTL affecting a trait occasionally corresponded between different populations or between different homeologous Brassica chromosomes, our data supported other molecular and morphological data in suggesting that the Brassica genus is rapidly evolving. Comparative data enabled us to identify a number of candidate genes from Arabidopsis that warrant further investigation to determine if some of them might account for Brassica QTL. The Arabidopsis/Brassica system is an important example of both the challenges and opportunities associated with extrapolation of genomic information from facile models to large-genome taxa including major crops.




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