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Molecular ecology and selection in the drought-related Asr gene polymorphisms in wild and cultivated common bean ([i]Phaseolus vulgaris[/i] L.)
- Source :
- BMC Genetics, BMC Genetics, BioMed Central, 2012, 13, ⟨10.1186/1471-2156-13-58⟩, BMC Genetics (13), . (2012), BMC Genetics, Vol 13, Iss 1, p 58 (2012)
- Publication Year :
- 2012
- Publisher :
- HAL CCSD, 2012.
-
Abstract
- Background The abscisic acid (ABA) pathway plays an important role in the plants’ reaction to drought stress and ABA-stress response (Asr) genes are important in controlling this process. In this sense, we accessed nucleotide diversity at two candidate genes for drought tolerance (Asr1 and Asr2), involved in an ABA signaling pathway, in the reference collection of cultivated common bean (Phaseolus vulgaris L.) and a core collection of wild common bean accessions. Results Our wild population samples covered a range of mesic (semi-arid) to very dry (desert) habitats, while our cultivated samples presented a wide spectrum of drought tolerance. Both genes showed very different patterns of nucleotide variation. Asr1 exhibited very low nucleotide diversity relative to the neutral reference loci that were previously surveyed in these populations. This suggests that strong purifying selection has been acting on this gene. In contrast, Asr2 exhibited higher levels of nucleotide diversity, which is indicative of adaptive selection. These patterns were more notable in wild beans than in cultivated common beans indicting that natural selection has played a role over long time periods compared to farmer selection since domestication. Conclusions Together these results suggested the importance of Asr1 in the context of drought tolerance, and constitute the first steps towards an association study between genetic polymorphism of this gene family and variation in drought tolerance traits. Furthermore, one of our major successes was to find that wild common bean is a reservoir of genetic variation and selection signatures at Asr genes, which may be useful for breeding drought tolerance in cultivated common bean.
- Subjects :
- 0106 biological sciences
acide abscisique
nucleotide polymorphism
dna polymorphism
microsatellite markers
core
collection
salt tolerance
diversity
domestication
genome
mesoamerican
protein
approche gène candidat
01 natural sciences
Nucleotide diversity
polymorphisme génétique
Negative selection
Naturvetenskap
Genetics(clinical)
Genetics (clinical)
Phaseolus
2. Zero hunger
Genetics
0303 health sciences
education.field_of_study
Natural selection
Vegetal Biology
Ecology
biology
food and beverages
Droughts
Natural Sciences
Research Article
lcsh:QH426-470
Drought tolerance
Population
Genes, Plant
03 medical and health sciences
Genetic variation
Botany
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology
Domestication
education
030304 developmental biology
amélioration génétique
Polymorphism, Genetic
fungi
tolérance à la sécheresse
phaseolus vulgaris
diversité nucléotidique
15. Life on land
biology.organism_classification
lcsh:Genetics
stress hydrique
Biologie végétale
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 14712156
- Database :
- OpenAIRE
- Journal :
- BMC Genetics, BMC Genetics, BioMed Central, 2012, 13, ⟨10.1186/1471-2156-13-58⟩, BMC Genetics (13), . (2012), BMC Genetics, Vol 13, Iss 1, p 58 (2012)
- Accession number :
- edsair.doi.dedup.....8db251c8990b770ae04737f905264e3a