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Related Experiment Video

Updated: Jan 21, 2026

Protocols for Obtaining Zygotic and Somatic Embryos for Studying the Regulation of Early Embryo Development in the Model Legume Medicago truncatula
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Transforming compound leaf patterning by manipulating REVOLUTA in Medicago truncatula.

Chuanen Zhou1, Lu Han1, Yang Zhao1

  • 1The Key Laboratory of Plant Development and Environmental Adaptation Biology, Ministry of Education, School of Life Science, Shandong University, Qingdao, 266237, China.

The Plant Journal : for Cell and Molecular Biology
|July 28, 2019
PubMed
Summary

Class III homeodomain-leucine zipper (HD-ZIPIII) genes regulate leaf polarity. A study in Medicago truncatula reveals REVOLUTA (MtREV1) is crucial for compound leaf development and auxin homeostasis.

Keywords:
MedicagoREVOLUTAHD-ZIPIII gene familycompound leaf patterningleaf polarity

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Area of Science:

  • Plant developmental biology
  • Molecular genetics
  • Plant physiology

Background:

  • Leaves develop polarity along three axes: dorsoventral, proximodistal, and mediolateral.
  • Class III homeodomain-leucine zipper (HD-ZIPIII) genes, regulated by microRNA165/166, are key for adaxial leaf identity.
  • The specific roles of HD-ZIPIII genes in compound leaf development remain largely unknown.

Purpose of the Study:

  • To investigate the function of HD-ZIPIII genes in compound leaf development in Medicago truncatula.
  • To elucidate the role of REVOLUTA (MtREV1) in establishing leaf polarity and leaflet number.
  • To understand the relationship between MtREV1, auxin homeostasis, and leaf patterning.

Main Methods:

  • Screening of a retrotransposon-tagged mutant population in Medicago truncatula.
  • Phenotypic characterization of a mutant with altered leaflet numbers.
  • Genetic analysis of the REVOLUTA (MtREV1) gene and its role in leaf development.
  • Analysis of auxin content in wild-type and mutant plants.

Main Results:

  • A mutant with increased leaflet number and partial loss of adaxial identity was identified.
  • A lesion in the HD-ZIPIII gene REVOLUTA (MtREV1) caused these developmental defects.
  • Overexpression of an MtMIR166-insensitive MtREV1 resulted in adaxialized leaves and ectopic leaflets.
  • Alterations in leaf patterning were associated with changes in free auxin content.

Conclusions:

  • MtREV1 is essential for determining leaf adaxial-abaxial polarity in Medicago truncatula.
  • MtREV1 plays a critical role in the patterning of compound leaves, influencing leaflet number.
  • The function of MtREV1 in leaf development is linked to maintaining proper auxin homeostasis.