Mapping genes for deep-seeding tolerance in barley |
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Authors: | Hidekazu Takahashi Kazuhiro Sato and Kazuyoshi Takeda |
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Institution: | (1) Research Institute for Bioresources, Okayama University, Chuo 2-20-1, Kurashiki, Okayama 710-0046, Japan;(2) Present address: Department of Biological Production, Faculty of Bioresource Sciences, Akita Prefectural University, Akita 010-0195, Japan |
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Abstract: | Deep-seeding tolerance, the emergence of seedlings from deep seeded conditions, is involved in stand establishment in semi-arid
regions, where the soil surface is too dry for seed germination. Genes determining deep-seeding tolerance in barley were mapped
using two doubled haploid populations derived from the following crosses: Harrington × TR306 (H/T)and Step toe × Morex (S/M).
Significant quantitative trait loci (QTLs) for deep-seeding tolerance were found in each population. Two QTL sex plained 40%
of the phenotypic variation in the H/T population and one QTL (S/M) 8% of the total phenotypic variance. Multiple QTLs accounting
for coleoptile length and first internode length were detected in both populations. In the H/T population, there were coincident
QTLs for deep-seeding tolerance, coleoptile length and first internode length on the long arm of chromosome 5H. These QTLs
correspond with previously reported QTLs for abscisic acid and gibberellic acid response. QTL coincidence may be due to the
pleiotropic effects of alleles at a single locus. This information may be useful for breeding programs manipulating morphological
and physiological traits in order to develop varieties for semi-arid regions.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | barley deep-seeding tolerance inheritance QTL |
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