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The relationship between population structure and aluminum tolerance in cultivated sorghum

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Relation http://oar.icrisat.org/93/
http://dx.doi.org/10.1371/journal.pone.0020830
 
Title The relationship between population structure and aluminum tolerance in cultivated sorghum
 
Creator Caniato, F F
Guimarães, C T
Hamblin, M
Billot, C
Rami, Jean-François
Hufnagel, B
Kochian, L V
Liu, J
Garcia, A A F
Hash, C T
Ramu, P
Mitchell, S
Kresovich, S
Oliveira, A C
Avellar, Gisela de
Borém, A
Glaszmann, Jean-Christophe
Schaffert, R E
Magalhaes, J V
 
Subject Sorghum
 
Description Background: Acid soils comprise up to 50% of the world’s arable lands and in these areas aluminum (Al) toxicity impairs
root growth, strongly limiting crop yield. Food security is thereby compromised in many developing countries located in
tropical and subtropical regions worldwide. In sorghum, SbMATE, an Al-activated citrate transporter, underlies the AltSB locus
on chromosome 3 and confers Al tolerance via Al-activated root citrate release.
Methodology: Population structure was studied in 254 sorghum accessions representative of the diversity present in
cultivated sorghums. Al tolerance was assessed as the degree of root growth inhibition in nutrient solution containing Al. A
genetic analysis based on markers flanking AltSB and SbMATE expression was undertaken to assess a possible role for AltSB in
Al tolerant accessions. In addition, the mode of gene action was estimated concerning the Al tolerance trait. Comparisons
between models that include population structure were applied to assess the importance of each subpopulation to Al
tolerance.
Conclusion/Significance: Six subpopulations were revealed featuring specific racial and geographic origins. Al tolerance
was found to be rather rare and present primarily in guinea and to lesser extent in caudatum subpopulations. AltSB was
found to play a role in Al tolerance in most of the Al tolerant accessions. A striking variation was observed in the mode of
gene action for the Al tolerance trait, which ranged from almost complete recessivity to near complete dominance, with a
higher frequency of partially recessive sources of Al tolerance. A possible interpretation of our results concerning the origin
and evolution of Al tolerance in cultivated sorghum is discussed. This study demonstrates the importance of deeply
exploring the crop diversity reservoir both for a comprehensive view of the dynamics underlying the distribution and
function of Al tolerance genes and to design efficient molecular breeding strategies aimed at enhancing Al tolerance.
 
Publisher Public Library of Science
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/93/1/PLoS__ONE_6_6_e20830_2011.pdf
Caniato, F F and Guimarães, C T and Hamblin, M and Billot, C and Rami, Jean-François and Hufnagel, B and Kochian, L V and Liu, J and Garcia, A A F and Hash, C T and Ramu, P and Mitchell, S and Kresovich, S and Oliveira, A C and Avellar, Gisela de and Borém, A and Glaszmann, Jean-Christophe and Schaffert, R E and Magalhaes, J V (2011) The relationship between population structure and aluminum tolerance in cultivated sorghum. PLoS ONE, 6 (6). 14pp.