Molecular marker assisted genetic analysis of head shattering in six- rowed barley

N. Kandemir, D. A. Kudrna, S. E. Ullrich, A. Kleinhofs

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Head shattering in barley (Hordeum vulgare L.) has two forms; brittle rachis and weak rachis. Brittle rachis is not observed in cultivated barley since all cultivars carry non-brittle alleles at one of the two complementary brittle rachis loci (Btr1;Btr2). Weak rachis causes head shattering in barley cultivars and may be confused with brittle rachis. Brittle rachis has been mapped to the chromosome 3 (3H) short arm while map position(s) of the weak rachis is unknown. Two major and a putative minor QTL for head shattering were mapped using the Steptoe x Morex doubled haploid line population. The largest QTL, designated Hst-3, located on the chromosome 3 (3H) centromeric region, is associated with a major yield QTL. The Steptoe Hst-3 region, when transferred into Morex, resulted in a substantial decrease in head shattering. High-resolution mapping of Hst-3 was achieved using isogenic lines. Brittle rachis was mapped with molecular markers and shown to be located in a different position from that of Hst-3. The second major QTL, designated Hst-2 S, is located on chromosome 2 S. This locus is associated with an environmentally sensitive yield QTL.

Original languageEnglish (US)
Pages (from-to)203-210
Number of pages8
JournalTheoretical and Applied Genetics
Issue number1-2
StatePublished - 2000
Externally publishedYes


  • Brittle rachis
  • Peduncle curvature
  • QTL
  • Spike density
  • Weak rachis

ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics


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