Interactions between plant hormones and thiol-related heavy metal chelators

Review paper
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Abstract

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.

Keywords

Heavy metal Phytochelatin Plant growth regulators Plant hormones Thiols 

Abbreviations

ABA

Abscisic acid

ACC

1-Aminocyclopropane-1-carboxylic acid

ACO

ACC-oxidase

ACS

ACC-synthase

BRs

Brassinosteroids

CKs

Cytokinins

dcSAM

Decarboxylated S-adenosyl-methionine

γ-GCS

γ-Glutamyl-cysteine synthase

GA

Gibberelins

GSH

Glutathione

GSS

Glutathione synthase

JA

Jasmonic acid

MeJA

Methyl jamonic acid

NaSA

Sodium salicylate

PA

Polyamine

PC

Phytochelatin

PCS

Phytochelatin synthase

PUT

Putrescine

SA

Salicylic acid

SAM

S-adenosyl-methionine

SPD

Spermidine

SPDS

Spermidine synthase

SPM

Spermine

SPMS

Spermine synthase

Notes

Acknowledgements

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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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

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

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