Auxin signaling and vascular cambium formation enable storage metabolism in cassava tuberous roots.
Auxin
cassava
development
gibberellin
parenchyma
root
starch
storage
transcriptomics
xylem
Journal
Journal of experimental botany
ISSN: 1460-2431
Titre abrégé: J Exp Bot
Pays: England
ID NLM: 9882906
Informations de publication
Date de publication:
04 05 2021
04 05 2021
Historique:
received:
10
11
2020
accepted:
04
03
2021
pubmed:
14
3
2021
medline:
22
5
2021
entrez:
13
3
2021
Statut:
ppublish
Résumé
Cassava storage roots are among the most important root crops worldwide, and represent one of the most consumed staple foods in sub-Saharan Africa. The vegetatively propagated tropical shrub can form many starchy tuberous roots from its stem. These storage roots are formed through the activation of secondary root growth processes. However, the underlying genetic regulation of storage root development is largely unknown. Here we report distinct structural and transcriptional changes occurring during the early phases of storage root development. A pronounced increase in auxin-related transcripts and the transcriptional activation of secondary growth factors, as well as a decrease in gibberellin-related transcripts were observed during the early stages of secondary root growth. This was accompanied by increased cell wall biosynthesis, most notably increased during the initial xylem expansion within the root vasculature. Starch storage metabolism was activated only after the formation of the vascular cambium. The formation of non-lignified xylem parenchyma cells and the activation of starch storage metabolism coincided with increased expression of the KNOX/BEL genes KNAT1, PENNYWISE, and POUND-FOOLISH, indicating their importance for proper xylem parenchyma function.
Identifiants
pubmed: 33712830
pii: 6169305
doi: 10.1093/jxb/erab106
pmc: PMC8096603
doi:
Substances chimiques
Indoleacetic Acids
0
Plant Proteins
0
Banques de données
Dryad
['10.5061/dryad.0cfxpnw0t']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
3688-3703Informations de copyright
© The Author(s) 2021. Published by Oxford University Press on behalf of the Society for Experimental Biology.
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