Domestication Quantitative Trait Loci in Triticum Dicoccoides, the Progenitor of Wheat

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2003 Feb 27

PMID 12604784

Citations 134

Authors

Junhua Peng

Yefim Ronin

Tzion Fahima

Marion S Roder

Youchun Li

Eviatar Nevo

Abraham Korol

Affiliations

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Abstract

Wild emmer wheat, Triticum dicoccoides, is the progenitor of modern tetraploid and hexaploid cultivated wheats. Our objective was to map domestication-related quantitative trait loci (QTL) in T. dicoccoides. The studied traits include brittle rachis, heading date, plant height, grain size, yield, and yield components. Our mapping population was derived from a cross between T. dicoccoides and Triticum durum. Approximately 70 domestication QTL effects were detected, nonrandomly distributed among and along chromosomes. Seven domestication syndrome factors were proposed, each affecting 5-11 traits. We showed: (i) clustering and strong effects of some QTLs; (ii) remarkable genomic association of strong domestication-related QTLs with gene-rich regions; and (iii) unexpected predominance of QTL effects in the A genome. The A genome of wheat may have played a more important role than the B genome during domestication evolution. The cryptic beneficial alleles at specific QTLs derived from T. dicoccoides may contribute to wheat and cereal improvement.

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