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A second mechanism for aluminum resistance in wheat relies on citrate efflux and maps to chromosome 4BL

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Title A second mechanism for aluminum resistance in wheat relies on citrate efflux and maps to chromosome 4BL
Not Available
 
Creator P R Ryan, H Raman, Sanjay Gupta, Horst W J and Delhaize E
 
Subject aluminium,citrate,resistance
 
Description Not Available
The first confirmed mechanism for aluminum (Al) resistance in plants is encoded by the wheat (Triticum aestivum) gene,
TaALMT1, on chromosome 4DL. TaALMT1 controls the Al-activated efflux of malate from roots, and this mechanism is
widespread among Al-resistant genotypes of diverse genetic origins. This study describes a second mechanism for Al
resistance in wheat that relies on citrate efflux. Citrate efflux occurred constitutively from the roots of Brazilian cultivars
Carazinho, Maringa, Toropi, and Trintecinco. Examination of two populations segregating for this trait showed that citrate
efflux was controlled by a single locus. Whole-genome linkage mapping using an F2 population derived from a cross between
Carazinho (citrate efflux) and the cultivar EGA-Burke (no citrate efflux) identified a major locus on chromosome 4BL, Xcec,
which accounts for more than 50% of the phenotypic variation in citrate efflux. Mendelizing the quantitative variation in citrate
efflux into qualitative data, the Xcec locus was mapped within 6.3 cM of the microsatellite marker Xgwm495 locus. This linkage
was validated in a second population of F2:3 families derived from a cross between Carazinho and the cultivar Egret (no citrate
efflux). We show that expression of an expressed sequence tag, belonging to the multidrug and toxin efflux (MATE) gene
family, correlates with the citrate efflux phenotype. This study provides genetic and physiological evidence that citrate efflux is
a second mechanism for Al resistance in wheat.
Not Available
 
Date 2018-11-02T06:48:29Z
2018-11-02T06:48:29Z
2009-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/9067
 
Language English
 
Relation Not Available;
 
Publisher Elsevier