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Strigolactones, karrikins and beyond.

Carolien De Cuyper1,2, Sylwia Struk1,2, Lukas Braem1,2,3,4

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Summary
This summary is machine-generated.

Plant hormones strigolactones and karrikins, perceived by D14/MAX2 and KAI2/MAX2, regulate plant growth. This review clarifies their distinct and shared roles, including unknown karrikin-like molecules.

Keywords:
MAX2hormone signallingkarrikinsstrigolactones

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Area of Science:

  • Plant biology
  • Hormone signaling
  • Molecular genetics

Background:

  • Strigolactones (SLs) and karrikins (KARs) are plant signaling molecules with overlapping perception mechanisms.
  • SLs signal via DWARF 14 (D14) and MORE AXILLARY GROWTH 2 (MAX2); KARs utilize KARRIKIN INSENSITIVE 2 (KAI2) and MAX2.
  • MAX2 mutants exhibit complex phenotypes due to impaired signaling of both SLs and KARs.

Purpose of the Study:

  • To critically review the diverse biological processes regulated by strigolactones and karrikins.
  • To delineate the unique and common roles of SLs and KARs in plant development.
  • To discuss the significance of potentially unknown plant-derived karrikin-like molecules.

Main Methods:

  • Literature review and critical analysis of existing research.
  • Comparative analysis of signaling pathways involving D14, KAI2, and MAX2.
  • Examination of mutant phenotypes (e.g., max2, d14, max3, max4) to infer signaling roles.

Main Results:

  • The MAX2 protein is crucial for both SL and KAR signaling pathways.
  • Phenotypes observed in max2 mutants are a composite of defects in both D14- and KAI2-dependent signaling.
  • The synthetic SL analog rac-GR24 can mimic both SL and KAR signals, complicating distinct role attribution.

Conclusions:

  • Distinguishing the specific roles of SLs and KARs requires careful consideration of shared signaling components.
  • The existence and function of endogenous karrikin-like molecules warrant further investigation.
  • Understanding these pathways is key to deciphering plant growth regulation.