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| Title: Structure , allelic diversity and selection of Asr genes , candidate for drought tolerance , in Oryza sativa L and wild relatives .
| | Author: Philippe R Courtois B McNally KL Mournet P El-Malki R Le Paslier MC Fabre D Billot C Brunel D Glaszmann JC This D | | Journal: Theor Appl Genet Citation: V : 121 P : 769-87 Year: 2010 Type: MEDLINE | | Literature: oryza Field: abstract Doc ID: pub20454772 Accession (PMID): 20454772 | | Abstract: Asr ( ABA , stress , ripening ) genes represent a small gene family potentially involved in drought tolerance in several plant species .
To analyze their interest for rice breeding for water-limited environments , this gene family was characterized further .
Genomic organization of the gene family reveals six members located on four different chromosomes and with the same exon-intron structure .
The maintenance of six members of the Asr gene family , which are the result of combination between tandem duplication and whole genome duplication , and their differential regulation under water stress , involves probably some sub-functionalization .
The polymorphism of four members was studied in a worldwide collection of 204 accessions of Oryza sativa L and 14 accessions of wild relatives ( O rufipogon and O nivara ) .
The nucleotide diversity of the Asr genes was globally low , but contrasted for the different genes , leading to different shapes of haplotype networks .
Statistical tests for neutrality were used and compared to their distribution in a set of 111 reference genes spread across the genome , derived from another published study .
Asr3 diversity exhibited a pattern concordant with a balancing selection at the species level and with a directional selection in the tropical japonica sub-group .
This study provides a thorough description of the organization of the Asr family , and the nucleotide and haplotype diversity of four Asr in Oryza sativa species .
Asr3 stood out as the best potential candidate .
The polymorphism detected here represents a first step towards an association study between genetic polymorphisms of this gene family and variation in drought tolerance traits .
| Matching Sentences:
[ Sen. 8, subscore: 1.00 ]: Asr3 diversity exhibited a pattern concordant with a balancing selection at the species level and with a directional selection in the tropical japonica sub-group .
[ Sen. 10, subscore: 1.00 ]: Asr3 stood out as the best potential candidate .
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