Comparative mapping of the wheat chromosome 5A Vrn-A1 region with rice and its relationship to QTL for flowering time

R. N. Sarma, B. S. Gill, T. Sasaki, G. Galiba, J. Sutka, D. A. Laurie, J. W. Snape

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The vernalization gene Vrn-A1 on chromosome 5A is the predominant gene determining the spring/winter habit difference in bread wheat. Vrn-A1 was physically mapped using a set of deletion lines which located it to the region of chromosome 5A flanked by deletion breakpoints 0.68 and 0.78. This interval was shown to be homoeologous to a region of rice chromosome 3 that contains the flowering-time QTL Hd-6, previously mapped in a Nipponbare x Kasalath cross, and FLTQ1, a novel QTL identified by analysis of 78 F3 families derived from a cross of 'IR20' x '63-83'. Possible relationships between Vrn-A1 and rice QTL are discussed. Analysis of the chromosome 5A deletion lines showed evidence for a second, more proximal flowering-time effect located between deletion breakpoints 0.56 and 0.64. The proximal part of chromosome 5A is homoeologous to rice chromosome 9, on which two QTL were detected in the 'IR20 x '63-83' cross. The possible relationship between these effects is also discussed.

Original languageEnglish
Pages (from-to)103-109
Number of pages7
JournalTheoretical and Applied Genetics
Volume97
Issue number1-2
DOIs
Publication statusPublished - Jul 1998

Keywords

  • Comparative trait mapping
  • Deletion mapping
  • Flowering time
  • QTLs
  • Vernalization response

ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics

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