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Natural variation of indels in the CTB3 promoter confers cold tolerance in japonica rice
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Natural variation of indels in the CTB3 promoter confers cold tolerance in japonica rice
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Journal Article
Natural variation of indels in the CTB3 promoter confers cold tolerance in japonica rice
2025
Overview
Improvement of cold tolerance at the booting stage (CTB) in rice is a key strategy for cultivation in high-altitude and high-latitude regions. Here, we identify
CTB3
gene, encoding a calmodulin-binding transcriptional activator that positively regulates cold tolerance at the booting stage in
japonica
rice. Two indels (57-bp and 284-bp) in the
CTB3
promoter confer a differential transcriptional response to cold between the
japonica
and
indica
subspecies. OsTCP19 suppresses
CTB3
expression by binding to these indels, negatively regulating cold tolerance. CTB3 activates the expression of
TREHALOSE-6-PHOSPHATE PHOSPHATASE1
(
OsTPP1
), reducing trehalose 6-phosphate (Tre6P) levels, which increases sugar accumulation in panicles and improves cold tolerance. Additionally, favorable alleles of
OsTCP19
and
CTB3
are selected in
japonica
rice for cold adaptation. These findings highlight the important role of
CTB3
in cold adaptation and its potential for improving cold tolerance in rice breeding.
Cold tolerance at the booting stage is critical for the expansion of rice cultivation area. Here, the authors report that a CAMTA family transcription factor encoding gene
CTB3
positively regulates
japonica
rice booting stage cold tolerance and its upstream and downstream interactors to fulfill the functionality.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 38/39
/ 38/43
/ Adaptation, Physiological - genetics
/ Binding
/ Cold
/ Gene Expression Regulation, Plant
/ Humanities and Social Sciences
/ Phosphoric Monoester Hydrolases - genetics
/ Phosphoric Monoester Hydrolases - metabolism
/ Plants, Genetically Modified
/ Promoter Regions, Genetic - genetics
/ Rice
/ Science
