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GrainGenes Reference Report: JEB-55-1335

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Reference	JEB-55-1335
Title	Molecular mapping of a gene responsible for Al-activated secretion of citrate in barley
Journal	Journal of Experimental Botany
Year	2004
Volume	55
Pages	1335-1341
Author	Ma JF [ Show all 6 ]
Abstract	Aluminium (Al) toxicity is an important limitation to barley ( Hordeum vulgare L.) on acid soil. Al-resistant cultivars of barley detoxify Al externally by secreting citrate from the roots. To link the genetics and physiology of Al resistance in barley, genes controlling Al resistance and Al-activated secretion of citrate were mapped. An analysis of Al-induced root growth inhibition from 100 F SUB 2 seedlings derived from an Al-resistant cultivar (Murasakimochi) and an Al-sensitive cultivar (Morex) showed that a gene associated with Al resistance is localized on chromosome 4H, tightly linked to microsatellite marker Bmag353. Quantitative trait locus (QTL) analysis from 59 F SUB 4 seedlings derived from an F SUB 3 plant heterozygous at the region of Al resistance on chromosome 4H showed that a gene responsible for the Al-activated secretion of citrate was also tightly linked to microsatellite marker Bmag353. This QTL explained more than 50% of the phenotypic variation in citrate secretion in this population. These results indicate that the gene controlling Al resistance on barley chromosome 4H is identical to that for Al-activated secretion of citrate and that the secretion of citrate is one of the mechanisms of Al resistance in barley. The identification of the microsatellite marker associated with both Al resistance and citrate secretion provides a valuable tool for marker-assisted selection of Al-resistant lines
External Databases	Pubmed: 15155781
Keyword	[ Hide all but 1 of 38 ] al aluminium aluminum tolerance gene barley barley chromosome chromosome citrate secretion f2 gene gene mapping growth hordeum inhibition linkage map locus mapping marker microsatellite microsatellite marker molecular mapping organic acids phenotypic variation physiology population qtl quantitative trait quantitative trait locus quantitative-trait-locus resistance rflp marker root root growth root growth inhibition secretion selection soil tool toxicity

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