Root structural aspects associated with copper toxicity in oregano (Origanum vulgare subsp. hirtum)

Panou-Filotheou, H.; Bosabalidis, Artemios M.

doi:10.1016/j.plantsci.2004.01.026

Cited by 67 publications

(24 citation statements)

References 22 publications

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“…Contrary to Cu, other toxic metals like Cd, Zn, Al and Cr have been widely studied for their impacts at all plant levels on xylem vessels, but the consequences of copper treatment on xylem were only studied in roots. Result of the Cu contamination on the xylem structures is (1) the rise of vessels with larger diameter and (2) the absence of variation in vessel number, in opposite to measurements obtained under the previous heavy metals (Panou-Filotheou & Bosabalidis, 2004). However in M. alterniflorum, no diameter increase is observed.…”

Section: Discussionmentioning

confidence: 61%

Differential responses of Myriophyllum alterniflorum DC (Haloragaceae) organs to copper: physiological and developmental approaches

et al. 2011

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International audienceCopper is an essential element for the function of metabolic pathways in many living organisms like photosynthesis in plants. But, for the last decades, anthropogenic sources and release of Cu lead to environmental pollution particularly in aquatic ecosystems. The aquatic plant, Myriophyllum alterniflorum, known as a bioindicator of metal pollution, could be used as biomonitor. The aim of this study is to evaluate biomarkers responses of watermilfoil during Cu pollution at high environmental levels (100 μg l−1 CuSO4) in controlled conditions. Morphological and anatomical features like a new double endodermis (DE) layer were evidenced in response to Cu treatment. Moreover, physiological parameters like pigments contents, osmotic potential and proline content present a differential response to Cu stress in young and old leaves of watermilfoil. Finally, despite a rapid and strong phytoaccumulation of Cu, only young leaves are slightly affected in their cell membrane integrity as indicated by MDA content. In comparison with the Cu effect on other aquatic macrophytes, M. alterniflorum develops particular protection mechanisms like the ROS scavenging using proline rather than carotenoids, the reduction of water loss with the DE and the heavy metal elimination through senescence to protect preferentially the photosynthetic components of the young leaves and the main-stem elongation. Due to its Cu sensitivity, M. alterniflorum appears as important in the field of environmental studies using plant biomarkers

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Section: Discussionmentioning

confidence: 61%

Differential responses of Myriophyllum alterniflorum DC (Haloragaceae) organs to copper: physiological and developmental approaches

et al. 2011

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“…Roots at the highest Cu also often displayed localized swellings behind the tips of many of the lateral roots which were noted to contain platelike cells rather than the typical elongated cells (Figure 4). This formation of plate-like cells is attributed to a restriction in cell elongation associated with Cu toxicity (Panou-Filotheou and Bosabalidis, 2004;Savage et al, 1981). Although the symptoms described above were observed in solutions containing ‡1.9 lM Cu 2+ , it was noted that root hairs were more sensitive, with reductions in root hair formation occurring at ‡0.89 lM Cu 2+ .…”

Section: Discussionmentioning

confidence: 98%

“…Indeed, interveinal chlorosis (consistent with Fe deficiency) was observed in the two highest Cu treatments approximately 3 DAP. Decreases in shoot concentrations of Ca, Mg and Fe and is typical of Cu toxicity (Ali et al, 2002;Lidon and Henriques, 1993;Ouzounidou et al, 1995;Panou-Filotheou and Bosabalidis, 2004) and is most likely due to a nonspecific effect of Cu on ion absorption and translocation due to an impairment of root function (for example, membrane leakiness, reduced ion uptake, or a reduction in radial transport or xylem loading). Induced Fe deficiency has often been reported to be associated with Cu toxicity (Ouzounidou, 1994;Taylor and Foy, 1985), and is also typical of toxicities of other metals such as Al, Co, Tl and Ni (Clark et al, 1981;Kaplan et al, 1990).…”

Section: Discussionmentioning

confidence: 99%

Effect of Cu Toxicity on Growth of Cowpea (Vigna unguiculata)

2006

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Accurate determination of the rhizotoxicity of Cu in dilute nutrient solutions is hindered by the difficulty of maintaining constant, pre-determined concentrations of Cu (micromolar) in solution.The critical Cu 2+ activity associated with a reduction in the growth of solution-grown cowpea (Vigna unguiculata (L.) Walp. cv Caloona) was determined in a system in which Cu was maintained constant through the use of a cation exchange resin. The growth of roots and shoots was found to be reduced at solution Cu 2+ activities ≥ 1.7 µM (corresponding to 90 % maximum growth).Although root growth was most likely reduced due to a direct Cu 2+ toxicity, it is considered that the shoot growth reduction is attributable to a decrease in tissue concentrations of K, Ca, Mg, and Fe and the formation of interveinal chlorosis. At high Cu 2+ activities, roots were brown in color, short and thick, had bent root tips with cracking of the epidermis and outer cortex, and had local swellings behind the roots tips due to a reduction in cell elongation. Root hair growth was reduced at concentrations lower than that which caused a significant reduction in overall root fresh weight.Abbreviations: CDTA -cyclohexane-1,2-diaminetetra-acetic acid; DI -deionised; EC -electrical conductivity; I -ionic strength; ICPAES -inductively coupled plasma atomic emission spectrometry; ICPMS -inductively coupled plasma mass spectrometry

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“…On the contrary, there is no common trend in Mg, S, Fe and Zn variations in response to Cu 2þ excess. The concentrations of these nutrients are differently affected depending on the plant species [25,48,50]. Natural variation in S, Fe and Mn contents was also observed between accessions of Arabidopsis thaliana exposed to Cu 2þ excess [64].…”

Section: Effect Of Cu 2þ Excess On Plant Growth and Mineral Statusmentioning

confidence: 90%

Response to copper excess in Arabidopsis thaliana: Impact on the root system architecture, hormone distribution, lignin accumulation and mineral profile

Lequeux

Hermans

Lutts

et al. 2010

Plant Physiology and Biochemistry

343

196

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Root structural aspects associated with copper toxicity in oregano (Origanum vulgare subsp. hirtum)

Cited by 67 publications

References 22 publications

Differential responses of Myriophyllum alterniflorum DC (Haloragaceae) organs to copper: physiological and developmental approaches

Differential responses of Myriophyllum alterniflorum DC (Haloragaceae) organs to copper: physiological and developmental approaches

Effect of Cu Toxicity on Growth of Cowpea (Vigna unguiculata)

Response to copper excess in Arabidopsis thaliana: Impact on the root system architecture, hormone distribution, lignin accumulation and mineral profile

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