Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 8

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Effect of heavy metals on root growth and peroxidase activity in barley root tip

100%
Haluskova L., Valentovicova K., Huttova J., Mistrik
Acta Physiologiae Plantarum
|
2010
|
tom 32
|
nr 1
In the present work, we investigated the alteration of oxidative and peroxidative activities of peroxidases (PODs) along the longitudinal root axis of barley seedlings during heavy metal (HM; e.g., Cd, Cu, Hg, Ni, Pb) treatment. Analysis of the individual root segments revealed that all of the analyzed HMs caused an increase of guaiacol-POD activity, however to a different extent and spatial distribution. Cd-induced ferulic acid POD activity was observed along the whole root tip (RT), while Cu and Hg caused its increase in the meristematic zone and Ni mainly at the end of the differentiation zone of RT. The activation of coniferyl alcohol POD by HMs was detected along the whole RT. HM-induced hydrogen peroxide-generating POD activity was localized mainly to the elongation zone of RT. Elevated chlorogenic acid POD activity was observed in the meristematic zone and at the end of the differentiation zone of RTs. The activation of several PODs is probably associated with enhanced H₂O₂ production and lignification as a defense response of roots to several HM, to prevent their uncontrolled flux. On the other hand, this defense response is accompanied by root growth inhibition, due to the enhanced rigidification of cell wall and accelerated differentiation of RTs.
2

Auxin signalling is involved in cadmium-induced glutathione-S-transferase activity in barley root

100%
Bocova B., Huttova J., Mistrik I., Tamas L.
Acta Physiologiae Plantarum
|
2013
|
tom 35
|
nr 09
Transient exposure of barley roots to Cd, IAA or H2O2 for 30 min resulted in a significant root growth inhibition. Cd significantly increased the GST activity of roots 6 h after the end of short-term treatment. This increase was more relevant in root segment containing differentiation zone than in root segment just immediately behind the root apex. In contrast to Cd treatment, the shortterm exposure of barley roots to IAA resulted in a significant increase of GST activity along the whole root tip and this increase was detectable already 3 h after the treatment with 10 μM IAA. Similarly to IAA, exogenously applied 10 mM H2O2 for 30 min caused significant increase of GST activity along the whole root tip 6 h after the treatment. This increase was already detectable 3 h after the exposure, but only in the differentiation zone of root tip. Auxin influx or signalling inhibitor considerable decreased the Cd- or IAA-induced GST activity in barley root tips. The strong activation of GST even after a brief exposure of barley roots to Cd support the crucial role of GST in the Cd-induced stress response in which presumably IAA and H2O2 play an important signalling role including the activation of GST.
3

Expression of defence-related peroxidases Prx7 and Prx8 during abiotic stresses in barley roots

100%
Tamas L., Durcekova K., Huttova J., Mistrik I.
Acta Physiologiae Plantarum
|
2009
|
tom 31
|
nr 1
The expression of defence-related peroxidases Prx7 and Prx8 in barley roots grown under selected abiotic stress conditions (toxic metals: Cd, Al, Co, Cu, Hg; drought, salinity, extreme temperatures: heat, cold) and compounds activating (2,4-D) or inhibiting (SHAM) POD activity as well as H₂O₂ and H₂O₂ scavenger (DTT) was characterized. Strong Cd concentration dependent expression of Prx8 peroxidase gene was observed, which correlated with root growth inhibition induced by Cd-and some other stress factors (heavy metals, heat and salinity). Application of H₂O₂ did not cause changes in expression of Prx8, but H₂O₂ scavenger (DTT) as well as the inhibitor (SHAM) and the activator (2,4-D) of PODs induced increase in Prx8 expression. Our results demonstrate that root growth inhibition during any disturbance of active oxygen species (AOS) in root tissue is correlated with upregulation of Prx8 gene expression in barley roots.
4

Cadmium-induced microsomal membrane-bound peroxidases mediated hydroxen peroxide production in barley roots

100%
Tamas L., Huttova J., Mistrik I., Olle M.
Acta Physiologiae Plantarum
|
2006
|
tom 28
|
nr 5
The effect of cadmium on microsomal membrane-bound peroxidases and their involvement in hydrogen peroxide production was studted in barley roots. One anionic and two cationic peroxidases were detected, which were strongly activated by Cd treatment. Positive correlation was found between root growth inhibition and increased peroxidase, NADH oxidase activity and H2O2 generation in root microsomal membrane fraction of Cd-treated barley roots.
5

The effect of aluminium on polypeptide pattern of cell wall proteins isolated from the roots of Al-sensitive and Al-resistant barley cultivars

100%
Tamas L., Huttova J., Hajasova L., Mistrik I.
Acta Physiologiae Plantarum
|
2001
|
tom 23
|
nr 2
6

Elevated oxalate oxidase activity is correlated with Al-induced plasma membrane injury and root growth inhibition in young barley roots

100%
Tamas L., Simonovicova M., Huttova J., Mistrik I.
Acta Physiologiae Plantarum
|
2004
|
tom 26
|
nr 1
7

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

88%
Tamas L., Bocova B., Huttova J., Mistrik I., Zelinova V.
Acta Physiologiae Plantarum
|
2017
|
tom 39
|
nr 02
8

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

76%
Zelinova V., Alemayehu A., Bocova B., Huttova J., Mistrik I., Tamas L.
Acta Physiologiae Plantarum
|
2014
|
tom 36
|
nr 11
Short-term exposure (15 min) of barley roots to different chemical elements revealed that Cd, Cu, Hg and Pb were the most toxic ones causing a marked root growth inhibition even at µM concentrations. Gd, La, Al, Cr, As, Zn, Ni and Se inhibited root growth to a similar extent only at mM concentrations. Despite the high 20 mM concentration, Co caused only a slight, while Mn, Mg or Ca did not evoke any root growth inhibition. Elements at concentrations inhibiting root growth caused a considerable accumulation of indole-3-acetic acid in the root apex. While Cr, As and Zn inhibited, Cd, Cu, Hg, Pb, Gd, La and Al markedly stimulated the generation of reactive oxygen species in the beginning of differentiation zone. Auxin signalling inhibitor alleviated or prevented root growth inhibition, reactive oxygen species generation and the stimulation of lipoxygenase and glutathione peroxidase activity by various elements, indicating a key role of auxin signalling in the stress response of barley root tip. On the other hand, it did not affect or even had an additive effect on dehydroascorbate reductase and ascorbic acid oxidase activity in combination with different elements. Our results indicate that the primary response of barley roots to the presence of various chemical elements during the shortterm treatment is not a specific but rather a general adaptive stress response enabling the plant to survive adverse conditions.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.