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Author Itoh J.I., Hibara K.I., Kojima M., Sakakibara H., Nagato Y.
Title Rice DECUSSATE controls phyllotaxy by affecting the cytokinin signaling pathway.
Abstract:
Phyllotaxy is defined as a spatial arrangement of leaves on the stem. The mechanism responsible for this extremely regular pattern is one of the most fascinating enigmas in plant biology. In this study, we identified a gene regulating the phyllotactic pattern in rice. Loss-of-function mutants of the DECUSSATE (DEC) gene displayed a phyllotactic conversion from normal distichous to decussate. The dec mutants had an enlarged SAM with enhanced cell division activity. In contrast to the SAM, the size of the root apical meristem (RAM) in dec was reduced, and cell division activity was suppressed. These phenotypes indicate that DEC has opposite functions in SAM and RAM. Map-based cloning revealed that DEC encodes a plant-specific protein containing a glutamine-rich region and a conserved motif. Although its molecular function is unclear, the conserved domain is shared with fungi and animals. Expression analysis showed that several type-A response regulator genes that act in the cytokinin (CK) signaling pathway were downregulated in the dec mutant. In addition, dec seedlings showed a reduced responsiveness to exogenous CK. Our results suggest that DEC is a factor that controls the phyllotactic pattern by affecting the CK signaling in rice. ゥ 2012 The Authors. The Plant Journal ゥ 2012 Blackwell Publishing Ltd.
Journal Plant J.
Country Japan
Volume 72
Pages 869-881
Year 2012
PubMed ID 22889403
PubMed Central ID -
DOI 10.1111/j.1365-313X.2012.05123.x
URL -
Relation
Gene OSH1 RR5 RR6 _
INSD AB683949
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
-
Stages in Each Organ
- Muant Lines (Gene)
-
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase