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MicroRNA156-SPL13B Module Induces Parthenocarpy Through the Gibberellin Pathway.

Da-Ru Wang1, Chun-Ling Zhang2, Xun Wang1

  • 1Apple Technology Innovation Center of Shandong Province, Shandong Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production, National Key Laboratory of Wheat Improvement, College of Horticulture Science and Engineering, Shandong Agricultural University, Taian, Shandong, China.

Plant Biotechnology Journal
|August 18, 2025
PubMed
Summary
This summary is machine-generated.

Overexpression of miR156h promotes seedless fruit development (parthenocarpy) by regulating gibberellic acid (GA) levels. This involves the MdSPL13B gene, offering insights into fruit production.

Keywords:
H3K27me3PRC2gibberellic acidmiRNA156parthenocarpy

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Area of Science:

  • Plant biology
  • Molecular genetics
  • Agricultural science

Background:

  • Fruit development typically requires pollination and fertilization.
  • Parthenocarpy, the development of seedless fruits, is a desirable trait for consumers and yield stability.
  • Understanding the genetic regulation of parthenocarpy is crucial for improving fruit production.

Purpose of the Study:

  • To investigate the role of miR156h in regulating parthenocarpy under unpollinated conditions.
  • To elucidate the molecular mechanism by which miR156h influences gibberellic acid (GA) pathways.
  • To identify key genes involved in the miR156-SPL-GA regulatory module controlling parthenocarpy.

Main Methods:

  • Overexpression of miR156h in plant models.
  • Gibberellic acid (GA) quantification and analysis.
  • Gene expression analysis and promoter binding assays.
  • Histone modification analysis.

Main Results:

  • Overexpression of miR156h induced parthenocarpy in unpollinated conditions.
  • miR156h regulates GA accumulation through the MdSPL13B gene.
  • MdSPL13B directly targets promoters of GA synthesis genes (MdKO, MdKAO2, MdGA20ox).
  • MdSPL13B indirectly promotes GA deactivation by targeting MdMSI1, affecting histone modification of GA deactivation genes (MdGA2ox8, MdSPY).

Conclusions:

  • miR156h acts as a key regulator of parthenocarpy via a GA-dependent pathway.
  • The miR156-SPL-GA module provides novel insights into the genetic control of seedless fruit development.
  • This research offers potential targets for enhancing fruit production and yield stability.