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Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer

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OsbHLH073 Negatively Regulates Internode Elongation and Plant Height by Modulating GA Homeostasis in Rice.

Jinwon Lee¹, Sunok Moon², Seonghoe Jang³

¹School of Applied Biosciences, Kyungpook National University, Daegu 41566, Korea.

Plants (Basel, Switzerland)

|April 29, 2020

Summary

A rice transcription factor, OsbHLH073, regulates plant height by controlling gibberellic acid (GA) biosynthesis. Overexpression leads to semi-dwarfism and poor panicle exsertion by downregulating GA biosynthesis genes OsKO1 and OsKO2.

Keywords:

GA homeostasis OsbHLH073 bHLH transcription factor gibberellin internode elongation plant height rice

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Area of Science:

Plant Biology
Genetics
Agronomy

Background:

Plant height and biomass are crucial agronomic traits influenced by internode elongation.
Molecular mechanisms governing internode elongation in crops remain incompletely understood.

Purpose of the Study:

To identify and functionally characterize novel genes regulating internode elongation in rice.
To elucidate the role of the atypical basic helix-loop-helix transcription factor OsbHLH073 in plant development.

Main Methods:

Gain-of-function studies using overexpression (OsbHLH073-OX) and activation tagging (osbhlh073-D) in rice.
Phenotypic analysis, gibberellic acid (GA3) treatment, quantitative gene expression analysis (OsKO1, OsKO2).
Yeast two-hybrid and subcellular localization assays for OsbHLH073 protein function.

Main Results:

Activation tagging and overexpression of OsbHLH073 resulted in semi-dwarfism and reduced panicle exsertion.
Exogenous GA3 partially rescued the semi-dwarf phenotype.
OsbHLH073 negatively regulated the expression of GA biosynthesis genes OsKO1 and OsKO2.
OsbHLH073 functions as a nuclear-localized transcriptional activator.

Conclusions:

OsbHLH073 is a key regulator of rice plant height, internode elongation, and panicle exsertion.
OsbHLH073 influences these traits by modulating gibberellic acid biosynthesis through OsKO1 and OsKO2.
This study provides insights into the genetic control of plant architecture in rice.