Does abscisic acid affect strigolactone biosynthesis?

Considering the importance of the strigolactones and their biosynthetic origin, we investigated the relationship with the plant hormone abscisic acid

Juan A. López‐Ráez

2009

Scholarcy highlights

  • Strigolactones are important signalling molecules that were first described as germination stimulants for the seeds of parasitic plants of the genera Striga and Orobanche
  • We previously demonstrated that ABA-deficient maize and tomato mutants with a mutation in NCED exhibit a decreased strigolactone production by the roots
  • ABA is an apocarotenoid produced via oxidative cleavage of epoxycarotenoids through action of NCEDs, which catalyze the rate-limiting step in ABA biosynthesis
  • We have previously demonstrated that in the ABA-deficient mutants vp14 and notabilis in maize and tomato, respectively - having a mutation in an NCED and showing a lower ABA content - the production of strigolactones was decreased by about 40%
  • From these results it was concluded that the NCEDs either have a direct role in strigolactone biosynthesis or that ABA has a regulatory role in this process
  • We show here that the corresponding decrease in ABA and strigolactone production occurs in two other well characterized tomato ABA-deficient mutants sitiens and flacca that are mutated in the last step of ABA biosynthesis - transformation of ABA
  • Strigolactone content in the root exudates of the tomato ABA-deficient mutant sitiens, and corresponding wild-type after ABA application

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