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Pod indehiscence in common bean is associated to the fine regulation of PvMYB26

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Di Vittori,  V.
Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Alseekh,  S.
The Genetics of Crop Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Sampathkumar,  A.
Plant Cell Biology and Microscopy, Infrastructure Groups and Service Units, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Fröhlich,  A.
Plant Cell Biology and Microscopy, Infrastructure Groups and Service Units, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Fernie,  A. R.
Central Metabolism, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Citation

Di Vittori, V., Bitocchi, E., Rodriguez, M., Alseekh, S., Bellucci, E., Nanni, L., et al. (2020). Pod indehiscence in common bean is associated to the fine regulation of PvMYB26. Journal of Experimental Botany, 72(5), 1617-1633. doi:10.1093/jxb/eraa553.


Cite as: https://hdl.handle.net/21.11116/0000-0008-1CA0-4
Abstract
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 to 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.