Theoretical and Applied Genetics

, Volume 101, Issue 1–2, pp 203–210

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

  • N. Kandemir
  • D. A. Kudrna
  • S. E. Ullrich
  • A. Kleinhofs
Original Paper

Abstract 

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 × 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.

Key words Brittle rachis Weak rachis QTL Spike density Peduncle curvature 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • N. Kandemir
    • 1
  • D. A. Kudrna
    • 1
  • S. E. Ullrich
    • 1
  • A. Kleinhofs
    • 1
  1. 1.Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164-6420, USA Fax: +1-509/335-8674 e-mail: andyk@wsu.edu, Present address: N. Kandemir, Gaziosmanpasa Universitesi Ziraat Fakultesi, Tarla Bitkileri Bolumu 60110, Tokat, TurkeyTR

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