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HISTONE DEACETYLASE19 Controls Ovule Number Determination and Transmitting Tract Differentiation.

Silvia Manrique1, Alex Cavalleri1, Andrea Guazzotti1

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HISTONE DEACETYLASE 19 (HDA19) is crucial for plant reproduction. It downregulates SHOOT MERISTEMLESS (STM) in the carpel margin meristem, enabling ovule and reproductive tract development in Arabidopsis.

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Area of Science:

  • Plant reproductive biology
  • Molecular genetics
  • Epigenetics

Background:

  • The gynoecium is vital for flowering plant reproduction, housing ovules and reproductive tissues (ReT) like the stigma, style, and transmitting tract (TT).
  • These structures develop from the carpel margin meristem (CMM), where the key meristem gene SHOOT MERISTEMLESS (STM) must be downregulated for organogenesis.
  • The precise mechanism controlling STM downregulation in the CMM remained unelucidated.

Purpose of the Study:

  • To investigate the role of HISTONE DEACETYLASE 19 (HDA19) in Arabidopsis ovule and ReT differentiation.
  • To understand how STM is downregulated in the CMM to facilitate reproductive organ development.

Main Methods:

  • Analysis of the hda19-3 mutant phenotype.
  • Fluorescence-activated cell sorting (FACS) combined with RNA-sequencing of CMM cells.
  • Chromatin immunoprecipitation (ChIP) assays.
  • RNA interference (RNAi) for STM knockdown.

Main Results:

  • The hda19-3 mutant showed reduced ovule number and defective TT differentiation.
  • In hda19-3 CMM, organ development genes were downregulated, while meristematic markers, including STM, were upregulated.
  • HDA19 directly targets STM, and its activity is necessary for STM downregulation, promoting ovule and ReT development.
  • The transcription factor SEEDSTICK also regulates STM via histone acetylation.

Conclusions:

  • HDA19 plays an essential role in downregulating STM within the CMM.
  • This HDA19-mediated STM downregulation is critical for initiating ovule formation and differentiating reproductive tract tissues.
  • The study identifies key epigenetic and genetic factors controlling meristem activity necessary for plant reproductive organogenesis.