Light intensity-mediated auxin homeostasis in spikelets links carbohydrate metabolism enzymes with grain filling rate in rice.
AGPase
Auxin
Carbohydrates
Low light
Rice
Starch
Starch synthase
Journal
Protoplasma
ISSN: 1615-6102
Titre abrégé: Protoplasma
Pays: Austria
ID NLM: 9806853
Informations de publication
Date de publication:
Jul 2023
Jul 2023
Historique:
received:
24
11
2022
accepted:
13
02
2023
medline:
8
6
2023
pubmed:
28
2
2023
entrez:
27
2
2023
Statut:
ppublish
Résumé
Low light (LL) stress during the grain-filling stage acutely impairs the quality and quantity of starch accumulation in rice grains. Here, we observed that LL-induced poor starch biosynthesis is modulated by auxin homeostasis, which regulates the activities of major carbohydrate metabolism enzymes such as starch synthase (SS) and ADP-glucose pyrophosphorylase (AGPase) in rice. Further, during the grain-filling period under LL, the starch/sucrose ratio increased in leaves but significantly decreased in the developing spikelets. This suggests poor sucrose biosynthesis in leaves and starch in the grains of the rice under LL. A lower grain starch was found to be correlated with the depleted AGPase and SS activities in the developing rice grains under LL. Further, under LL, the endogenous auxin (IAA) level in the spikelets was found to be synchronized with the expression of a heteromeric G protein gene, RGB1. Interestingly, under LL, the expression of OsYUC11 was significantly downregulated, which subsequently resulted in reduced IAA in the developing rice spikelets, followed by poor activation of grain-filling enzymes. This resulted in lowered grain starch accumulation, grain weight, panicle number, spikelet fertility, and eventually grain yield, which was notably higher in the LL-susceptible (GR4, IR8) than in the LL-tolerant (Purnendu, Swarnaprabha) rice genotypes. Therefore, we hypothesize that depletion in auxin biosynthesis under LL stress is associated with the downregulation of RBG1, which discourages the expression and activities of grain-filling enzymes, resulting in lower starch production, panicle formation, and grain yield in rice.
Identifiants
pubmed: 36847862
doi: 10.1007/s00709-023-01844-8
pii: 10.1007/s00709-023-01844-8
doi:
Substances chimiques
Starch
9005-25-8
Sucrose
57-50-1
Indoleacetic Acids
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
1233-1251Informations de copyright
© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.
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