Pod indehiscence in common bean is associated with the fine regulation of PvMYB26.
MYB26
Phaseolus vulgaris L
Common bean
convergent evolution
gene expression
genome-wide association study
introgression lines
pod anatomy
pod shattering
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
27 02 2021
27 02 2021
Historique:
received:
05
07
2020
accepted:
22
11
2020
pubmed:
29
11
2020
medline:
21
5
2021
entrez:
28
11
2020
Statut:
ppublish
Résumé
In legumes, pod shattering occurs when mature pods dehisce along the sutures, and detachment of the valves promotes seed dispersal. In Phaseolus vulgaris (L)., the major locus qPD5.1-Pv for pod indehiscence was identified recently. We developed a BC4/F4 introgression line population and narrowed the major locus down to a 22.5 kb region. Here, gene expression and a parallel histological analysis of dehiscent and indehiscent pods identified an AtMYB26 orthologue as the best candidate for loss of pod shattering, on a genomic region ~11 kb downstream of the highest associated peak. Based on mapping and expression data, we propose early and fine up-regulation of PvMYB26 in dehiscent pods. Detailed histological analysis establishes that pod indehiscence is associated with the lack of a functional abscission layer in the ventral sheath, and that the key anatomical modifications associated with pod shattering in common bean occur early during pod development. We finally propose that loss of pod shattering in legumes resulted from histological convergent evolution and that it is the result of selection at orthologous loci.
Identifiants
pubmed: 33247939
pii: 6009044
doi: 10.1093/jxb/eraa553
pmc: PMC7921299
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
1617-1633Informations de copyright
© The Author(s) 2020. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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