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Does abscisic acid affect strigolactone biosynthesis?

Juan A López-Ráez1,2, Wouter Kohlen1, Tatsiana Charnikhova1

  • 1Laboratory of Plant Physiology, Wageningen University, Droevendaalsesteeg 1, NL-6708 PB Wageningen, the Netherlands.

The New Phytologist
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

Plant hormones strigolactones and abscisic acid (ABA) are linked. ABA influences strigolactone production, suggesting ABA regulates strigolactone biosynthesis pathways crucial for plant development and signaling.

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Area of Science:

  • Plant Science
  • Hormone Signaling
  • Biochemistry

Background:

  • Strigolactones are plant hormones regulating plant development and symbiotic interactions.
  • Strigolactone biosynthesis originates from carotenoids, sharing precursors with abscisic acid (ABA).
  • The precise regulatory relationship between strigolactones and ABA remains incompletely understood.

Purpose of the Study:

  • To investigate the relationship between abscisic acid (ABA) levels and strigolactone biosynthesis.
  • To elucidate the role of ABA in the regulation of strigolactone production in plants.

Main Methods:

  • Analysis of strigolactone and ABA content using Liquid Chromatography-tandem Mass Spectrometry (LC-MS/MS).
  • Treatment with specific inhibitors of carotenoid cleavage enzymes (D2 and abamineSG).
  • Analysis of ABA-deficient tomato mutants (notabilis, sitiens, flacca).
  • Gene expression analysis of strigolactone biosynthesis genes (LeCCD7 and LeCCD8).

Main Results:

  • Inhibition of 9-cis-epoxycarotenoid dioxygenase (NCED) with abamineSG significantly reduced both ABA and strigolactone levels.
  • ABA-deficient mutants exhibited greatly reduced strigolactone levels.
  • Reduced strigolactone production in mutants correlated with the downregulation of LeCCD7 and LeCCD8 genes.
  • A specific inhibitor (D2) affected strigolactone but not ABA content.

Conclusions:

  • A significant correlation exists between endogenous ABA levels and strigolactone production.
  • Results suggest a regulatory role for ABA in the biosynthesis of strigolactones.
  • This finding provides insights into the intricate hormonal crosstalk in plants.