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Ethylene and pollination decrease transcript abundance of an ethylene receptor gene in Dendrobium petals.

Monthathip Thongkum1, Parichart Burns2, Anjana Bhunchoth3

  • 1Center for Agricultural Biotechnology, Kasetsart University, Kamphaeng Saen Campus, Nakhon Pathom 73140, Thailand; Center of Excellence on Agricultural Biotechnology (AG-BIO/PERDO-CHE), Bangkok 10900, Thailand.

Journal of Plant Physiology
|January 16, 2015
PubMed
Summary
This summary is machine-generated.

Ethylene Response Sensor 1 (Den-ERS1) gene expression in Dendrobium orchid petals decreases with flower opening and ethylene exposure. This ethylene receptor gene shows ethylene-induced down-regulated transcription, impacting flower senescence.

Keywords:
DendrobiumEthylene receptorFlower senescencePromoter analysis

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Orchidaceae Genetics

Background:

  • Ethylene is a key plant hormone regulating flower senescence.
  • Ethylene receptors play a crucial role in mediating ethylene responses.
  • Dendrobium orchids exhibit unique floral characteristics and senescence patterns.

Purpose of the Study:

  • To investigate the expression pattern of the Ethylene Response Sensor 1 (Den-ERS1) gene in Dendrobium orchid petals.
  • To determine the effect of pollination and ethylene on Den-ERS1 gene expression and flower senescence.
  • To identify potential transcription factors regulating Den-ERS1 expression.

Main Methods:

  • Quantitative analysis of Den-ERS1 gene transcript accumulation in floral buds and open flowers.
  • Treatment of flowers with exogenous ethylene and 1-methylcyclopropene (1-MCP).
  • Analysis of the 5' flanking region of Den-ERS1 for transcription factor binding sites.

Main Results:

  • Den-ERS1 transcripts were abundant in young floral buds and decreased as flowers aged.
  • Pollination and ethylene exposure accelerated senescence and reduced Den-ERS1 transcript levels.
  • 1-MCP treatment inhibited ethylene production and maintained high Den-ERS1 transcript levels.
  • The Den-ERS1 gene belongs to the group of ethylene-induced down-regulated transcription receptors.
  • Potential binding sites for transcription factors including EIN3-like, NAC, and RAV1 were identified.

Conclusions:

  • Den-ERS1 gene expression is negatively regulated by ethylene in Dendrobium orchid petals.
  • Ethylene signaling, mediated by receptors like Den-ERS1, plays a significant role in controlling orchid flower longevity.
  • Transcription factors binding to the Den-ERS1 promoter likely mediate its response to ethylene.