Zn2+-induced changes at the root level account for the increased tolerance of acclimated tobacco plants

Bazihizina, Nadia; Taiti, Cosimo; Marti, Lucia; Rodrigo-Moreno, Ana; Spinelli, Francesco; Giordano, Cristiana; Caparrotta, Stefania; Gori, Massimo; Azzarello, Elisa; Mancuso, Stefano

doi:10.1093/jxb/eru251

Cited by 43 publications

(25 citation statements)

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“…S2b), these results support the view that photosynthesis was initially limited by CO 2 diffusion as a consequence of low leaf stomatal conductance ( Medrano et al, 2002). This result is in accordance with the increasing evidence suggesting that exposure to toxic metal concentrations initially affects plant water relations (Barcelo and Poschenrieder, 1990;Sagardoy et al, 2010;Bazihizina et al, 2014).…”

Section: Discussionsupporting

confidence: 89%

Awaiting better times: A quiescence response and adventitious root primordia formation prolong survival under cadmium stress in Tetradenia riparia (Hochst.) Codd

Bazihizina

Taiti

Serre

et al. 2016

Environmental and Experimental Botany

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A B S T R A C TPlants survive stressful conditions by employing three main strategies: escape, tolerance, and survival. Experiments were conducted to pinpoint the response strategy adopted by Tetradenia riparia to cadmium (Cd) stress by monitoring several physiological parameters and plants' ability to recover once the stress receded. Cadmium (30 and 150 mM) strongly affected shoot and root growth in a dose dependent manner, with almost complete inhibition of shoot growth, stomatal opening and CO 2 assimilation in plants exposed to 150 mM CdSO 4 . Independently of the CdSO 4 concentrations, plants excluded Cd from the aboveground tissues, with concentrations in shoots remaining around 0.1 mmol g À1 dry mass.Furthermore, Cd stress was associated with a decline in methylation of Lys4 of histone H3, likely associated with the transition from an active to a quiescent state. Surprisingly, Cd also induced the initiation of root primordia in T. riparia stems, which, once placed in a Cd-free media, quickly (24 h) developed into adventitious roots, which were likely the driving factor of the rapid resumption of leaf elongation and photosynthetic activity, which increased almost 20-fold over the 3 weeks of recovery. Therefore T. riparia ability to survive Cd stress was mediated by quiescence, which associated with an excluder strategy and stem root primordia formation, enabled rapid resumption of growth under Cd-free conditions.

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Section: Discussionsupporting

confidence: 89%

Awaiting better times: A quiescence response and adventitious root primordia formation prolong survival under cadmium stress in Tetradenia riparia (Hochst.) Codd

Bazihizina

Taiti

Serre

et al. 2016

Environmental and Experimental Botany

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“…It has been found that the leaf area decreased in P. vulgaris exposed to Cd (Barceló et al 1986a(Barceló et al , 1988, C. sativus treated with Cu (Vinit-Dunand et al 2002) and Nicotiana tabacum subjected to an excess of Zn (Bazihizina et al 2014). In P. Fig.…”

Section: Effects Of Heavy Metals On Transpiratory Water Lossmentioning

confidence: 98%

“…If soils are high in soluble salts (including heavy metal salts), the osmotic potential in the soil solution might be lower than the potential of the cell sap in root. Under these circumstances, the soil solution would severely restrict the rate of water uptake by plants Barceló et al (1986a) Leaf Phaseolus vulgaris Becerril et al (1989) Leaf Medicago sativa Becerril et al (1989) Leaf Triforium pratense Poschenrieder et al (1989) Leaf Helianthus annuus Kastori et al (1992) Root, shoot Oryza sativa Moya et al (1993) Shoot Lactuca sativa Costa and Morel (1994) Shoot Lupinus albus Costa and Morel (1994) Shoot Pisum sativum Hernández et al (1997) Leaf Silene vulgaris Schat et al (1997) Leaf Hordeum vulgare Vassilev et al (1997Vassilev et al ( , 1998 Kholodova et al (2005Kholodova et al ( , 2011 Root Nicotiana tabacum Bazihizina et al (2014) Root, shoot Beta vulgaris Sagardoy et al (2010) Mesembr. cryst.…”

Section: Effects Of Heavy Metals On Water Uptakementioning

confidence: 99%

“…Studies on B. vulgaris exposed to Zn indicated that xylem ABA concentration was reduced (Sagardoy et al 2010). Anatomical analyses revealed that Zn and Ni at high concentrations caused severe damage in the roots of N. tabacum and P. guajava (Bazihizina et al 2014(Bazihizina et al , 2015 and Zn affected the functionality of the root plasma membrane (Bazihizina et al 2014). It can be supposed that enhanced metal concentrations could have a detrimental effect on ABA synthesis in roots (Sagardoy et al 2010).…”

Section: Effects Of Heavy Metals On Transpiratory Water Lossmentioning

confidence: 99%

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Water relations in plants subjected to heavy metal stresses

2016

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Concentrations of heavy metals in soil seldom reach a level sufficient to cause osmotic disturbances in plants. It is likely that water entry to the roots is indirectly governed by other factors which are themselves affected by metals. Decreased elongation of the primary root, impaired secondary growth, increased root dieback, or reduced root hair caused by toxic ions all exert a deleterious effect on the root-absorbing area and water uptake. Moreover, metals are able to decelerate short-distance water transfer both in symplast and apoplast, which in turn reduce the movement of water into the vascular system and affect water supply to the shoot. Long-distance transport is limited also due to decreased hydraulic conductivity in the root, stem and leaf midrib caused by a reduction in the size of vessels and tracheids, and partial blockage of xylem elements by cellular debris or gums. Heavy metals influence water delivery to the shoot due to inhibition of transpiration as they decrease the size of the leaves and the thickness of the lamina, reduce intercellular spaces, affect the density of stomata and decrease their aperture. Stomata closure is induced by direct interaction of toxic metals with guard cells and/or as a consequence of the early effects of metal toxicity on roots and stems. In metal-stressed plants, rootderived ABA or ABA-induced signals might play a role in stomatal movement. Disturbances in water relations trigger differential regulation of aquaporin gene expression, which may contribute to further reductions in water loss.

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“…A. halleri plants grown hydroponically accumulate metal ions in the cell wall of the rhizodermis mainly as Zn/Cd phosphate precipitates [95]. Excessive concentrations of metals have negative and even toxic effects on the plasma membrane of root cells, expressed as disturbed membrane functionality, which causes changes in membrane potential (E M ) and increased plant water loss [96,97]. The effects of divalent metal cations such as Cd 2+ and Zn 2+ on E M differ mainly according to the available heavy metal concentration, to its affinity status and mode of action [97,98].…”

Section: Mechanisms Involved In Zn Tolerance and Hyperaccumulationmentioning

confidence: 99%

Got to hide your Zn away: Molecular control of Zn accumulation and biotechnological applications

et al. 2015

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Zn2+-induced changes at the root level account for the increased tolerance of acclimated tobacco plants

Abstract: SummaryExposing plants to non-toxic metal concentrations elicits specific detoxification mechanisms in tobacco roots that improve root membrane functionality and leaf stomatal regulation with toxic zinc in the growing medium.

Cited by 43 publications

References 50 publications

Awaiting better times: A quiescence response and adventitious root primordia formation prolong survival under cadmium stress in Tetradenia riparia (Hochst.) Codd

Awaiting better times: A quiescence response and adventitious root primordia formation prolong survival under cadmium stress in Tetradenia riparia (Hochst.) Codd

Water relations in plants subjected to heavy metal stresses

Got to hide your Zn away: Molecular control of Zn accumulation and biotechnological applications

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