Effects of Cadmium Exposure on Phytochelatin and the Synthesis of Abscisic Acid in <i>Funalia trogii</i>

Yürekli, Füsun; Ünyayar, Ali; Porgali, Z. Banu; Mazmancı, Mehmet Ali

doi:10.1002/elsc.200420036

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…PCs production, that has a crucial role in the intracellular metal chelation, has been considered as a general response of plants to heavy metal exposure. Their production has been reported in plant seedlings of several Gymnosperms as well as in Angiosperms (Inouhe et al 2005), in fungi (Yurekli et al 2004) and in algae (Scarano and Morelli 2002).…”

Section: Discussionmentioning

confidence: 97%

Glutathione and phytochelatin contents in tomato plants exposed to cadmium

Ammar¹,

Mediouni²,

Tray³

et al. 2008

Biologia plant.

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The effect of cadmium on growth and contents of glutathione (GSH) and phytochelatins (PCs) were investigated in roots and leaves of tomato plants (Lycopersicon esculentum Mill. cv. 63/5 F1). The accumulation of Cd increased with external Cd concentrations and was considerably higher in roots than in leaves. Dry mass production decreased under Cd treatment especially in leaves. In both roots and leaves, exposure to Cd caused an appreciable decline in GSH contents and increase in PCs synthesis proportional to Cd concentrations in the growth medium. At the same Cd concentration, PCs production was higher in roots than in leaves. The implication of glutathione in PC synthesis was strongly suggested by the use of buthionine sulfoximine (BSO). The major fraction of Cd accumulated by tomato roots was in the form of a Cd-PCs complex.Additional key words: buthionine sulfoximine, complex Cd-PC, Lycopersicon esculentum.

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Section: Discussionmentioning

confidence: 97%

Glutathione and phytochelatin contents in tomato plants exposed to cadmium

Ammar¹,

Mediouni²,

Tray³

et al. 2008

Biologia plant.

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Fungal Biosorption of Ni (II) Ions

Ozsoy

Leeuwen

2011

Sustainable Bioenergy and Bioproducts

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Phytochelatins

Inouhe

2005

Braz. J. Plant Physiol.

122

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Phytochelatins (PCs) were first discovered as Cd-binding "Cadystins A and B" in a fission yeast and then in many plants as the major components of Cd-binding complexes. PCs have the general structure of (gamma-glutamyl-cysteinyl)n-glycine (n=2-11) and the variants with the repeated gamma-glutamyl-cysteinyl units are formed in some plants and yeast. They are capable of binding to various metals including Cd, Cu, Zn or As via the sulfhydryl and carboxyl residues, but their biosyntheses are controlled preferentially by the metal Cd or metalloid As. PCs are synthesized from glutathione (gamma-glutamyl-cysteinyl-glycine) in steps mediated by PC synthase. Genes (CAD1, PCS1) of the enzyme have been isolated from plants, fission yeast and some animals. Inhibition studies of PC biosynthesis via glutathione have demonstrated their fundamental roles in the metal detoxification in yeast and fungi, green algae and some aquatic plants, and also in the suspension-cultured cells and intact tissues in higher plants. Over-expression of PC synthase genes increases the Cd-tolerance in yeast and bacteria efficiently but not always in higher plant tissues especially in metal-accumulating species. "Hyperaccumulators" of Cd, Zn, Ni or As in terrestrial plants have a common feature where massive metal transport to shoots prevails, besides the ability of their roots to form PCs. This suggests that PC-based metal detoxification might be an ancient type of defense mechanism established in micro-algae or micro-fungi, and the additional PC-independent mechanism via vascular transport system became established later in higher plants. Readjustment of the PC-dependent and independent mechanisms at the metal-binding sites in the symplast and apoplast of shoots can be effective for further improvement of the metal detoxification activities and the tolerance characteristics of higher plants under various conditions.

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Effects of Cadmium Exposure on Phytochelatin and the Synthesis of Abscisic Acid in Funalia trogii

Cited by 3 publications

References 26 publications

Glutathione and phytochelatin contents in tomato plants exposed to cadmium

Glutathione and phytochelatin contents in tomato plants exposed to cadmium

Fungal Biosorption of Ni (II) Ions

Phytochelatins

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