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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Functional characterization of rice OsDof12.

Dejun Li1, Chunhua Yang, Xiaobing Li

  • 1State Key Laboratory of Plant Genomics and National Plant Gene Research Centre (Beijing), Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 5 Datun Road, Chaoyang District, 100101, Beijing, China. djli@genetics.ac.cn

Planta
|February 10, 2009
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Summary

OsDof12, a rice transcription factor, promotes early flowering by regulating Hd3a and OsMADS14 gene expression, particularly under long-day conditions. Its activity is influenced by light and developmental stage.

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Area of Science:

  • Plant molecular biology
  • Genetics
  • Transcriptional regulation

Background:

  • DNA-binding with one finger (Dof) proteins are crucial plant transcription factors.
  • Rice possesses 30 identified Dof genes involved in various biological processes.
  • Understanding specific Dof genes like OsDof12 is vital for plant science.

Purpose of the Study:

  • To characterize the functional properties of the rice Dof gene, OsDof12.
  • To investigate OsDof12's role in regulating plant development, specifically flowering time.
  • To elucidate the molecular mechanisms by which OsDof12 influences flowering.

Main Methods:

  • Transient expression assays using OsDof12-GFP fusion protein for nuclear localization.
  • Yeast one-hybrid system for trans-activation assays to determine transcriptional activity.
  • RNA expression analyses in different rice tissues and developmental stages, including response to dark treatment.
  • Analysis of transgenic rice lines overexpressing OsDof12 under long-day (LD) and short-day (SD) conditions.

Main Results:

  • OsDof12 protein localizes to the nucleus and exhibits transcriptional activity.
  • OsDof12 expression is not tissue-specific, fluctuates with development, and is inhibited by darkness.
  • Overexpression of OsDof12 accelerates flowering under LD conditions but not SD conditions.
  • OsDof12 up-regulates Hd3a and OsMADS14 expression under LD conditions, without affecting other key flowering time genes.

Conclusions:

  • OsDof12 functions as a transcriptional activator involved in plant development.
  • OsDof12 plays a significant role in regulating rice flowering time, particularly under LD photoperiods.
  • The findings suggest OsDof12 regulates flowering by modulating the expression of Hd3a and OsMADS14.