Wyniki wyszukiwania

1

Salt stress induced changes of reactive oxygen species and redox state in the roots of Atgstu19 and Atgstf8 mutants

100%

Horvath E., Bela K., Holinka B., Csiszar J.

Acta Physiologiae Plantarum

|

2018

|

tom 40

|

nr 11-11th International Conference Plant Functioning under Environmental Stress...

2

Investigation of drought tolerance of wheat varieties: the importance of glutathione s-transferase and peroxidase activities

88%

Csiszar J., Tari I., Galle A., Kiraly E., Erdei L.

Acta Physiologiae Plantarum

|

2004

|

tom 26

|

nr 3 suppl.

3

Influence of salicylic acid on salt stress acclimation of tomato plants: oxidative stress responses and osmotic adaptation

76%

Tari I., Simin L. M., Deer K. A., Csiszar J., Bajkan S., Kis G. Y., Szepesi A.

Acta Physiologiae Plantarum

|

2004

|

tom 26

|

nr 3 suppl.

4

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

The alleviation of the adverse effects of salt stress in the tomato plant by salicylic acid shows a time-and organ-specific antioxidant response

76%

Tari I., Csiszar J., Horvath E., Poor P., Takacs Z., Szepesi A.

Acta Biologica Cracoviensia. Series Botanica

|

2015

|

tom 57

|

nr 1

In the last decade contradictory results have been published as to whether exogenous salicylic acid (SA) can increase salt stress tolerance in cultivated plants by inducing an antioxidant response. Salt stress injury in tomato was mitigated only in cases when the plant was hardened with a high concentration of SA (~10-4 M), low concentrations were ineffective. An efficient accumulation of Na+ in older leaves is a well-known response to salt stress in tomato plants (Solanum lycopersicum cv. Rio fuego) but it remains largely unexplored whether young and old leaves or root tissues have a distinct antioxidant status during salt stress after hardening with 10-7 M or 10-4 M SA. The determination of superoxide dismutase (SOD) and catalase (CAT) activity revealed that the SAinduced transient increases in these enzyme activities in young leaf and/or root tissues did not correlate with the salt tolerance of plants. Salt stress resulted in a tenfold increase in ascorbate peroxidase (APX) activities of young leaves and significant increases in APX and glutathione reductase (GR) activities of the roots hardened with 10-4 M SA. Both total ascorbate (AsA) and glutathione pools reached their highest levels in leaves after 10-7 M SA pre-treatment. However, in contrast to the leaves, the total pool of AsA decreased in the roots under salt stress and thus, due to low APX activity, active oxygen species were scavenged by ascorbate non-enzymatically in these tissues. The increased GR activities in the roots after treatment with 10-4 M SA enabled plants to enhance the reduced glutathione (GSH) pool and maintain the redox status of AsA under high salinity, which led to increased salt tolerance.

5

Relationship between osmotic stress-induced abscisic acid accumulation, biomass production and plant growth in drought-tolerant and -sensitive wheat cultivars

64%

Guoth A., Benyo D., Csiszar J., Galle A., Horvath F., Cseuz L., Erdei L., Tari I.

Acta Physiologiae Plantarum

|

2010

|

tom 32

|

nr 4

The effects of increasing osmotic stress induced by 100–400 mOsm (-0.976 MPa) polyethylene glycol (PEG 6000) were investigated in a drought-tolerant (Triticum aestivum L. cv. Mv Emese) and drought-sensitive (cv. GK Élet) wheat cultivar at the three-leaf stage. During osmotic stress, the decline of the water potential (ψw) was more significant in the leaves, while the abscisic acid (ABA) levels of the roots increased earlier and remained higher in the sensitive than in the tolerant variety. There was an increasing gradient of ABA content toward the youngest leaves in the drought-sensitive GK Élet, while more ABA accumulated in the fully developed, older leaves of the tolerant cultivar Mv Emese. In accordance with the rapid and significant accumulation of ABA, the stomatal conductance decreased earlier in the tolerant cultivar. The effect of water stress on the PSII photochemistry was pronounced only 1 week after the exposure to PEG, as indicated by the earlier decrease of the net CO2 fixation, the effective quantum yield (ΦPSII) and the photochemical quenching (qP) in light-adapted samples of the tolerant variety in 400 mOsm PEG 6000. The stress treatment caused more significant reductions in these parameters toward the end of the experiment in the sensitive cultivar. In spite of small differences in the photosynthetic characteristics, the net biomass production was not significantly altered by this osmotic stress. The accumulation of ABA controlled the distribution of the biomass between the shoot and root systems under osmotic stress, and contributed to the development of stronger and deeper roots in the drought-sensitive cultivar GK Élet. However, the root elongation did not correlate with the drought sensitivity of these cultivars on the basis of crop yield.

6

Alteration of redox potential in the roots of Arabidopsis glutathione peroxidase-like mutants under salt stress

64%

Bela K., Riyazuddin R., Horvath E., Galle A., Hurton A., Bangash S. A. K., Ayaydin F., Csiszar J.

Acta Physiologiae Plantarum

|

2018

|

tom 40

|

nr 11-11th International Conference Plant Functioning under Environmental Stress...

7

Phenotyping shows improved physiological traits and seed yield of transgenic wheat plants expressing the alfalfa aldose reductase under permanent drought stress

52%

Feher-Juhasz E., Majer P., Sass L., Lantos C., Csiszar J., Turoczy Z., Mihaly R., Mai A., Horvath G. V., Vass I., Dudits D., Pauk J.

Acta Physiologiae Plantarum

|

2014

|

tom 36

|

nr 03

Members of the aldo–keto reductase family including aldose reductases are involved in antioxidant defense by metabolizing a wide range of lipid peroxidation-derived cytotoxic compounds. Therefore, we produced transgenic wheat genotypes over-expressing the cDNA of alfalfa aldose reductase gene. These plants consequently exhibit 1.5–4.3 times higher detoxification activity for the aldehyde substrate. Permanent drought stress was generated in the greenhouse by growing wheat plants in soil with 20 % water capacity. The control and stressed plants were monitored by a semi automatic phenotyping platform providing computer-controlled watering, digital and thermal imaging. Calculation of biomass values was based on the correlation (R²= 0.7556) between fresh weight and green pixel-based shoot surface area. The green biomass production by plants of the three transgenic lines was 12–26–41 % higher than the non-transgenic plants’ grown under water limitation. Thermal imaging of stressed nontransgenic plants indicated an elevation in the leaf temperature. The thermal status of transformants was similar at both normal and suboptimal water regime. In drought, the transgenic plants used more water during the growing season. The described phenotyping platform provided a comprehensive data set demonstrating the improved physiological condition of the drought stressed transgenic wheat plants in the vegetative growth phase. In soil with reduced water capacity two transgenic genotypes showed higher seed weight per plant than the control non-transgenic one. Limitation of greenhouse-based phenotyping in analysis of yield potential is discussed.

Ograniczanie wyników

Salt stress induced changes of reactive oxygen species and redox state in the roots of Atgstu19 and Atgstf8 mutants

Investigation of drought tolerance of wheat varieties: the importance of glutathione s-transferase and peroxidase activities

Influence of salicylic acid on salt stress acclimation of tomato plants: oxidative stress responses and osmotic adaptation

The alleviation of the adverse effects of salt stress in the tomato plant by salicylic acid shows a time-and organ-specific antioxidant response

Relationship between osmotic stress-induced abscisic acid accumulation, biomass production and plant growth in drought-tolerant and -sensitive wheat cultivars

Alteration of redox potential in the roots of Arabidopsis glutathione peroxidase-like mutants under salt stress

Phenotyping shows improved physiological traits and seed yield of transgenic wheat plants expressing the alfalfa aldose reductase under permanent drought stress