A PLETHORA/PIN-FORMED/auxin network mediates prehaustorium formation in the parasitic plant Striga hermonthica.
Journal
Plant physiology
ISSN: 1532-2548
Titre abrégé: Plant Physiol
Pays: United States
ID NLM: 0401224
Informations de publication
Date de publication:
01 08 2022
01 08 2022
Historique:
received:
31
08
2021
accepted:
25
03
2022
pubmed:
12
5
2022
medline:
4
8
2022
entrez:
11
5
2022
Statut:
ppublish
Résumé
The parasitic plant Striga (Striga hermonthica) invades the host root through the formation of a haustorium and has detrimental impacts on cereal crops. The haustorium results from the prehaustorium, which is derived directly from the differentiation of the Striga radicle. The molecular mechanisms leading to radicle differentiation shortly after germination remain unclear. In this study, we determined the developmental programs that regulate terminal prehaustorium formation in S. hermonthica at cellular resolution. We showed that shortly after germination, cells in the root meristem undergo multiplanar divisions. During growth, the meristematic activity declines and associates with reduced expression of the stem cell regulator PLETHORA1 and the cell cycle genes CYCLINB1 and HISTONE H4. We also observed a basal localization of the PIN-FORMED (PIN) proteins and a decrease in auxin levels in the meristem. Using the structural layout of the root meristem and the polarity of outer-membrane PIN proteins, we constructed a mathematical model of auxin transport that explains the auxin distribution patterns observed during S. hermonthica root growth. Our results reveal a fundamental molecular and cellular framework governing the switch of S. hermonthica roots to form the invasive prehaustoria.
Identifiants
pubmed: 35543497
pii: 6584021
doi: 10.1093/plphys/kiac215
pmc: PMC9342978
doi:
Substances chimiques
Indoleacetic Acids
0
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
2281-2297Informations de copyright
© The Author(s) 2022. Published by Oxford University Press on behalf of American Society of Plant Biologists.
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