Plant Growth Regulation

, Volume 85, Issue 2, pp 173–185 | Cite as

Interactions between plant hormones and thiol-related heavy metal chelators

  • Magda Pál
  • Tibor Janda
  • Gabriella Szalai
Review paper


Upon toxic metal stress numerous defence mechanisms have been induced, including the synthesis of metal-binding ligands and plant hormones or plant growth regulators in plants. As several elements in the promoter region of the heavy metal-responsive genes can be activated by plant hormones and growth regulators, understanding and revealing possible and special relationships between these regulator compounds and the metal chelator phytochelatins, which are in the first line of heavy metal defence mechanism is of great important. Phytochelatins are synthetized from glutathione and have a structure of [(γ-Glu-Cys)n]-Gly, where n is the number of repetition of the (γ-Glu-Cys) units. Evidences for the role of PCs in heavy metal tolerance are very strong; however, little information is available on how plant growth regulators influence the phytochelatin synthesis at molecular or even gene expression level. In the present review we provide an overview of the role and synthesis of phytochelatins in metal-tolerance mechanism from a new point of view, i.e. their relation to the plant growth regulator molecules, with special regard also on those cases, when close direct relationship exists because of the partly overlapped synthesis pathways of plant growth regulators and glutathione/phytochelatins.


Heavy metal Phytochelatin Plant growth regulators Plant hormones Thiols 



Abscisic acid


1-Aminocyclopropane-1-carboxylic acid










Decarboxylated S-adenosyl-methionine


γ-Glutamyl-cysteine synthase






Glutathione synthase


Jasmonic acid


Methyl jamonic acid


Sodium salicylate






Phytochelatin synthase




Salicylic acid






Spermidine synthase




Spermine synthase



This work was supported by the grant of the National Research, Development and Innovation Office, KH 124472, which is gratefully acknowledged.


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Authors and Affiliations

  1. 1.Centre for Agricultural Research, Agricultural InstituteHungarian Academy of SciencesMartonvásárHungary

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