Grain dormancy QTL identified in a doubled haploid barley population derived from two non-dormant parents

Hickey, L.T., Lawson, W., Arief, V.N., Fox, G., Franckowiak, J. and Dieters, M.J. (2012) Grain dormancy QTL identified in a doubled haploid barley population derived from two non-dormant parents. Euphytica, 188 1: 133-122.


Author Hickey, L.T.
Lawson, W.
Arief, V.N.
Fox, G.
Franckowiak, J.
Dieters, M.J.
Title Grain dormancy QTL identified in a doubled haploid barley population derived from two non-dormant parents
Journal name Euphytica  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2012-11
Sub-type Article
Year available 2011
DOI 10.1007/s10681-011-0577-9
Volume number 188
Issue number 1
ISSN 0014-2336; 1573-5060
Start page 133
End page 122
Total pages 10
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2012
Language eng
Abstract Grain dormancy provides protection against pre-harvest sprouting (PHS) in cereals. Composite interval mapping and association analyses were performed to identify quantitative trait loci (QTL) contributing grain dormancy in a doubled haploid (DH) barley population (ND24260 9 Flagship) consisting of 321 lines genotyped with DArT markers. Harvest-ripe grain collected from three field experimentswas germinated over a 7-day period to determine a weighted germination index for each line. DH lines were identified; however, both parental lines were nondormant and displayed rapid germination within the first two days of testing. Genetic analysis identified two QTL on chromosome 5H that were expressed consistently in each of the three environments. One QTL (donated by Flagship) was located close to the centromeric region of chromosome 5H (qSDFlag),accounting for up to 15% of the phenotypic variation. A second QTL with a larger effect (from ND24260) was detected on chromosome 5HL (qSDND), accounting for up to 35% of the phenotypic variation. qSDFlag and qSDND displayed an epistatic interaction and DH lines that had the highest levels of grain dormancy carried both genes. We demonstrate that qSDND in the ND24260 9 Flagship DH population is positioned proximal and independent to the well-characterised SD2 region that is associated with both high levels of dormancy and inferior malt quality. This indicates that it should be possible to develop cultivars that combine acceptable malting quality and adequate levels of grain dormancy for protection against PHS by utilizing these alternate QTL.
Keyword DArT genotyping
Germination index
Malt quality
Marker assisted selection
Pre-harvest sprouting
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online 12 November 2011.

 
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Created: Mon, 06 Feb 2012, 19:40:46 EST by Dr Glen Fox on behalf of Qld Alliance for Agriculture and Food Innovation