Incomplete filling in the basal region of maize endosperm: timing of development of starch synthesis and cell vitality.
T6P/SnRK1 signaling
basipetal starch accumulation
cell vitality
hormone signaling
maize endosperm
physiological development index
Journal
The Plant journal : for cell and molecular biology
ISSN: 1365-313X
Titre abrégé: Plant J
Pays: England
ID NLM: 9207397
Informations de publication
Date de publication:
30 Sep 2024
30 Sep 2024
Historique:
revised:
28
08
2024
received:
29
04
2024
accepted:
04
09
2024
medline:
30
9
2024
pubmed:
30
9
2024
entrez:
30
9
2024
Statut:
aheadofprint
Résumé
Starch synthesis in maize endosperm adheres to the basipetal sequence from the apex downwards. However, the mechanism underlying nonuniformity among regions of the endosperm in starch accumulation and its significance is poorly understood. Here, we examined the spatiotemporal transcriptomes and starch accumulation dynamics in apical (AE), middle (ME), and basal (BE) regions of endosperm throughout the filling stage. Results demonstrated that the BE had lower levels of gene transcripts and enzymes facilitating starch synthesis, corresponding to incomplete starch storage at maturity, compared with AE and ME. Contrarily, the BE showed abundant gene expression for genetic processing and slow progress in physiological development (quantified by an index calculated from the expression values of development progress marker genes), revealing a sustained cell vitality of the BE. Further analysis demonstrated a significant parabolic correlation between starch synthesis and physiological development. An in-depth examination showed that the BE had more active signaling pathways of IAA and ABA than the AE throughout the filling stage, while ethylene showed the opposite pattern. Besides, SNF1-related protein kinase1 (SnRK1) activity, a regulator for starch synthesis modulated by trehalose-6-phosphate (T6P) signaling, was kept at a lower level in the BE than the AE and ME, corresponding to the distinct gene expression in the T6P pathway in starch synthesis regulation. Collectively, the findings support an improved understanding of the timing of starch synthesis and cell vitality in regions of the endosperm during development, and potential regulation from hormone signaling and T6P/SnRK1 signaling.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : National Natural Science Foundation of China
ID : 32272013
Organisme : National Key Research and Development Program of China
ID : 2022YFD2300803
Organisme : National Key Research and Development Program of China
ID : 2023YFD2303302
Organisme : China Agriculture Research System of MOF and MARA
ID : CARS-02-16
Organisme : Deutsche Forschungsgemeinschaft
ID : 328017493/GRK 2366
Organisme : Postdoctoral Fellowship Program of CPSF
ID : GZC20233043
Informations de copyright
© 2024 Society for Experimental Biology and John Wiley & Sons Ltd.
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