NDLI: Depletion of extracellular calcium increases cadmium toxicity in barley root tip via enhanced Cd uptake-mediated superoxide generation and cell death

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Acta Physiologiae Plantarum : Volume 39, Issue 1, January 2017

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Depletion of extracellular calcium increases cadmium toxicity in barley root tip via enhanced Cd uptake-mediated superoxide generation and cell death

Content Provider	Springer Nature Link
Author	Tamás, Ladislav Bočová, Beáta Huttová, Jana Mistrík, Igor Zelivá, Veronika
Copyright Year	2017
Abstract	Whereas severe Cd stress (150 µM Cd) causes root growth arrest as a consequence of marked superoxide generation leading to extensive cell death in the root tips, mild Cd stress (15 µM Cd) evokes morphogenic responses, such as reduced root elongation and radial root expansion, resulting in shorter and thicker roots. Similar to the low Cd concentration-caused mild stress, treatment of roots with either Ba to remove exchangeable or EDTA to remove both exchangeable and tightly bound cations, including Ca and Mg, from the apoplast, induced root growth inhibition and swelling. However, pre-treatment of roots with Ba had a synergistic effect on the development of these mild Cd stress-induced morphogenic responses, but without the development of any other symptoms in the root tips. In turn, EDTA pre-treatment markedly increased the toxicity of Cd in barley root tips via enhanced Cd uptake-mediated superoxide generation, which evoked extensive cell death in the transition zone of root tips identically to the high Cd concentration-induced severe stress. While the mild stress-induced responses were alleviated by the inhibition of auxin signalling pathway, the severe stress-induced symptoms were prevented by Ca, but not Mg, supplementation or by the inhibition of Cd uptake into the root symplasm. Therefore, the appropriate concentration of Ca in the apoplast is crucial to prevent the rapid accumulation of Cd in the symplasm, which above a certain threshold level leads to the huge superoxide generation and cell death.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	39
Issue Number	2
e-ISSN	18611664
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-01-12
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Auxin signalling Cadmium Extracellular calcium Reactive oxygen species Root growth Plant Physiology Plant Genetics & Genomics Plant Biochemistry Plant Pathology Plant Anatomy/Development Agriculture
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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Primary stress response induced by different elements is mediated through auxin signalling in barley root tip

Salicylic acid alleviates cadmium-induced stress responses through the inhibition of Cd-induced auxin-mediated reactive oxygen species production in barley root tips.

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Low Cd concentration-activated morphogenic defence responses are inhibited by high Cd concentration-induced toxic superoxide generation in barley root tip

Depletion of extracellular calcium increases cadmium toxicity in barley root tip via enhanced Cd uptake-mediated superoxide generation and cell death

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Depletion of extracellular calcium increases cadmium toxicity in barley root tip via enhanced Cd uptake-mediated superoxide generation and cell death