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Related Experiment Videos

Cloning of a cDNA encoding EIN3-like protein (DC-EIL1) and decrease in its mRNA level during senescence in carnation

K Waki1, K Shibuya, T Yoshioka

  • 1Laboratory of Bioadaptation, Graduate School of Agricultural Science, Tohoku University, Tsutsumidori-amamiyamachi 1-1, Aoba-ku, Sendai 981-8555, Japan.

Journal of Experimental Botany
|April 3, 2001
PubMed
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Researchers identified a carnation gene, DC-EIL1, involved in flower senescence. Its expression decreases during natural and ethylene-induced aging, suggesting a role in petal aging.

Area of Science:

  • Plant molecular biology
  • Plant hormone signaling
  • Flower senescence

Background:

  • Ethylene and abscisic acid (ABA) are key regulators of plant senescence.
  • Ethylene-insensitive 3 (EIN3) is a crucial transcription factor in ethylene signaling pathways.
  • Understanding EIN3-like proteins in non-model species like carnations can reveal conserved senescence mechanisms.

Purpose of the Study:

  • To isolate and characterize a novel EIN3-like gene from senescing carnation petals.
  • To investigate the expression pattern of this gene during natural and induced senescence.
  • To explore its potential role in petal senescence regulation.

Main Methods:

  • Complementary DNA (cDNA) cloning using Reverse Transcription Polymerase Chain Reaction (RT-PCR) and Rapid Amplification of Complementary DNA Ends (RACE).

Related Experiment Videos

  • Sequence analysis to determine open reading frame and amino acid composition.
  • Northern blot analysis to assess gene expression levels in different tissues and conditions.

    • Main Results:

    • A cDNA clone, DC-EIL1, encoding a putative EIN3-like protein (662 amino acids) was successfully isolated from senescing carnation petals.
    • DC-EIL1 shares significant sequence identity (84%) in its N-terminal region with Arabidopsis EIN3 and tobacco TEIL.
    • DC-EIL1 mRNA levels significantly decreased in carnation flower tissues, particularly petals, during natural senescence and following treatment with ethylene or ABA.

    Conclusions:

    • DC-EIL1 is a carnation homolog of the EIN3 family of transcription factors.
    • The down-regulation of DC-EIL1 during senescence suggests its involvement in the regulation of petal aging in carnations.
    • This finding contributes to understanding the molecular mechanisms underlying flower senescence and ethylene signaling in plants.