【摘 要】
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Plant circadian clock has been provided to be involved in multiple physiology and metabolism process by monitoring external environment changes,including ph
【机 构】
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NationalKeyLaboratoryofCropGeneticImprovement,HuazhongAgriculturalUniversity,Wuhan430070,China
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Plant circadian clock has been provided to be involved in multiple physiology and metabolism process by monitoring external environment changes,including photoperiodic flowering regulation.Our previous study showed that OsELF3 acts as a floral activator in the long-day photoperiodic pathway via its crosstalk with the circadian clock in rice.However,post-transcription regulation of OsELF3 is still unclear.In this study,we showed that HAF1,an E3 ubiquitin ligase,physically interact with OsELF3 in vivo and in vitro.C-terminal domain of OsELF3 was identified as the functional motif for mediating interaction with HAF1,as well as formation of homodimer by itself.Further protein degradation assay indicated that OsELF3 is the direct substrate of HAF1 for ubiquitination in rice.Genetically,the oself3 haf1 double mutant headed as late as oself3 under long-day conditions.Previous investigation revealed that OsELF3 plays a crucial role in photoperiodic response to determine rice regional adaptability.We proposed that HAF1 plays a pivotal role in heading date modulation by ubiquitination of OsELF3 under long-day conditions.
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