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Phytochrome-regulated PIL1 derepression is developmentally modulated.

Yong-Sic Hwang1, Peter H Quail

  • 1Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, USA.

Plant & Cell Physiology
|February 26, 2008
PubMed
Summary
This summary is machine-generated.

PHYTOCHROME-INTERACTING FACTOR 3-LIKE 1 (PIL1) gene expression rapidly declines upon light exposure during seedling de-etiolation. Phytochromes mediate this repression, which is reversed by far-red light, but this reversal effectiveness changes over time.

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Area of Science:

  • Plant biology
  • Molecular genetics
  • Photomorphogenesis

Background:

  • Seedling de-etiolation is a critical developmental transition regulated by light.
  • PHYTOCHROME-INTERACTING FACTOR 3-LIKE 1 (PIL1) is an early light-responsive gene.
  • Phytochromes are key photoreceptors mediating plant responses to light quality and quantity.

Purpose of the Study:

  • To characterize the photoresponsiveness of PIL1 during seedling de-etiolation.
  • To investigate the roles of different phytochromes in regulating PIL1 expression.
  • To understand the dynamics of PIL1 repression and derepression by light signals.

Main Methods:

  • Quantitative analysis of PIL1 mRNA abundance under different light conditions (red and far-red light).
  • Utilized phytochrome-null mutants and signaling mutants to dissect photoreceptor functions.
  • Investigated the effect of continuous red light pre-exposure duration on far-red light-mediated derepression.

Main Results:

  • PIL1 mRNA levels rapidly decrease upon initial red light exposure, with a half-life of 15 minutes.
  • Multiple phytochromes, including phyA and phyB, are involved in repressing PIL1.
  • Far-red light rapidly derepresses PIL1, but the effectiveness of this reversal is biphasic and declines with prolonged red light exposure, suggesting a link to developmental transition.

Conclusions:

  • PIL1 photoresponsiveness is tightly regulated by phytochromes during de-etiolation.
  • The decline in derepression effectiveness is likely an indirect consequence of the etiolated-to-de-etiolated developmental shift.
  • Circadian regulation of PIL1 derepression requires entrainment to light cycles.