The influence of photoperiod on the Vrn-H2 locus (4H) which is a major determinant of plant development and reproductive fitness traits in a facultative x winter barley (Hordeum vulgare L.) mapping population

I. Karsai, K. Mészáros, P. Szucs, P. M. Hayes, L. Láng, Z. Bedo

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

To determine the effect of Vrn-H2 locus on plant developmental and agronomic traits, detailed controlled environment tests involving a factorial set of vernalization and photoperiod treatments were carried out using doubled haploid lines developed from a facultative (Vrn-H2-) x winter (Vrn-H2+) barley cross. The allele phase at the Vrn-H2 locus influenced heading date as well as the developmental and agronomic traits. The performance of Vrn-H2+ lines was significantly influenced by vernalization: reproductive fitness traits showed significant decreases without vernalization. However, the effects of alleles at the Vrn-H2 locus extended beyond simple satisfaction of the vernalization requirement. Vrn-H2+ lines showed increased reproductive fitness compared with Vrn-H2- lines when vernalization was followed by a long photoperiod. The responses of the two Vrn-H2 allele classes to photoperiod duration were quite different in terms of heading date, developmental and agronomic traits. These results suggest that alleles at the Vrn-H2 locus - and/or tightly linked gene(s) - respond primarily to the exogenous signal of vernalization (temperature), but when the vernalization requirement has been fulfilled, they also respond to photoperiod duration.

Original languageEnglish
Pages (from-to)468-472
Number of pages5
JournalPlant Breeding
Volume125
Issue number5
DOIs
Publication statusPublished - Oct 1 2006

Keywords

  • Hordeum vulgare
  • Photoperiod
  • Reproductive fitness
  • Vernalization
  • Vrn-H2

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

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