The Relationship between Population Structure and Aluminum Tolerance in Cultivated Sorghum

被引：24

作者：

Caniato, Fernanda F. ^{[1
]}

Guimaraes, Claudia T. ^{[1
]}

Hamblin, Martha ^{[2
]}

Billot, Claire ^{[3
]}

Rami, Jean-Francois ^{[3
]}

Hufnagel, Barbara ^{[1
,4
]}

Kochian, Leon V. ^{[5
]}

Liu, Jiping ^{[5
]}

Garcia, Antonio Augusto F. ^{[6
]}

Hash, C. Tom ^{[7
]}

Ramu, Punna ^{[7
]}

Mitchell, Sharon ^{[2
]}

Kresovich, Stephen ^{[2
]}

Oliveira, Antonio Carlos ^{[1
]}

de Avellar, Gisela ^{[1
]}

Borem, Aluizio ^{[8
]}

Glaszmann, Jean-Christophe ^{[3
]}

Schaffert, Robert E. ^{[1
]}

Magalhaes, Jurandir V. ^{[1
]}

机构：

[1] Embrapa Maize & Sorghum, Sete Lagoas, MG, Brazil

[2] Cornell Univ, Inst Genom Divers, Ithaca, NY USA

[3] Ctr Cooperat Int Rech Agron Dev CIRAD, UMR Ameliorat Genet & Adaptat Plantes Mediterrane, Montpellier, France

[4] Univ Fed Minas Gerais, Dept Biol Geral, Belo Horizonte, MG, Brazil

[5] Cornell Univ, USDA ARS, Robert W Holley Ctr Agr & Hlth, Ithaca, NY 14853 USA

[6] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Piracicaba, Brazil

[7] Int Crops Res Inst Semi Arid Trop, Hyderabad, Andhra Pradesh, India

[8] Univ Fed Vicosa, Vicosa, MG, Brazil

来源：

PLOS ONE | 2011年 / 6卷 / 06期

关键词：

REGULATES MULTIPLE GENES; ABC TRANSPORTER; ACID SOILS; MALATE TRANSPORTERS; ACTIVATED CITRATE; ARABIDOPSIS; DIVERSITY; RESISTANCE; EVOLUTION; ENCODES;

D O I：

10.1371/journal.pone.0020830

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 Alt(SB) 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 Alt(SB) and SbMATE expression was undertaken to assess a possible role for Alt(SB) 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. Alt(SB) 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.

引用

页数：14

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