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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F14%3A10289134%21RIV15-MSM-11310___
rdf:type
skos:Concept n12:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.jplph.2014.06.021
dcterms:description
Cytokinins (CKs) as well as the antioxidant enzyme system (AES) play important roles in plant stress responses. The expression and activity of antioxidant enzymes (AE) were determined in drought, heat and combination of both stresses, comparing the response of tobacco plants overexpressing the main cytokinin degrading enzyme, cytokinin oxidase/dehydrogenase, under the control of root-specific WRKY6 promoter (W6: CKX1 plants) or constitutive promoter (35S: CKX1 plants) and the corresponding wild-type (WT). Expression levels as well as activities of cytosolic ascorbate peroxidase, catalase 3, and cytosolic superoxide dismutase were low under optimal conditions and increased after heat and combined stress in all genotypes. Unlike catalase 3, two other peroxisomal enzymes, catalase 1 and catalase 2, were transcribed extensively under control conditions. Heat stress, in contrast to drought or combined stress, increased catalase 1 and reduced catalase 2 expression in WT and W6: CKX1 plants. In 35S: CKX1, catalase 1 expression was enhanced by heat or drought, but not under combined stress conditions. Mitochondrial superoxide dismutase expression was generally higher in 35S: CKX1 plants than in WT. Genes encoding for chloroplastic AEs, stromatal ascorbate peroxidase, thylakoidal ascorbate peroxidase and chloroplastic superoxide dismutase, were strongly transcribed under control conditions. All stresses down-regulated their expression in WT and W6: CKX1, whereas more stress-tolerant 35S: CKX1 plants maintained high expression during drought and heat. The achieved data show that the effect of down-regulation of CK levels on AES may be mediated by altered habit, resulting in improved stress tolerance, which is associated with diminished stress impact on photosynthesis, and changes in source/sink relations. (C) 2014 Elsevier GmbH. All rights reserved. Cytokinins (CKs) as well as the antioxidant enzyme system (AES) play important roles in plant stress responses. The expression and activity of antioxidant enzymes (AE) were determined in drought, heat and combination of both stresses, comparing the response of tobacco plants overexpressing the main cytokinin degrading enzyme, cytokinin oxidase/dehydrogenase, under the control of root-specific WRKY6 promoter (W6: CKX1 plants) or constitutive promoter (35S: CKX1 plants) and the corresponding wild-type (WT). Expression levels as well as activities of cytosolic ascorbate peroxidase, catalase 3, and cytosolic superoxide dismutase were low under optimal conditions and increased after heat and combined stress in all genotypes. Unlike catalase 3, two other peroxisomal enzymes, catalase 1 and catalase 2, were transcribed extensively under control conditions. Heat stress, in contrast to drought or combined stress, increased catalase 1 and reduced catalase 2 expression in WT and W6: CKX1 plants. In 35S: CKX1, catalase 1 expression was enhanced by heat or drought, but not under combined stress conditions. Mitochondrial superoxide dismutase expression was generally higher in 35S: CKX1 plants than in WT. Genes encoding for chloroplastic AEs, stromatal ascorbate peroxidase, thylakoidal ascorbate peroxidase and chloroplastic superoxide dismutase, were strongly transcribed under control conditions. All stresses down-regulated their expression in WT and W6: CKX1, whereas more stress-tolerant 35S: CKX1 plants maintained high expression during drought and heat. The achieved data show that the effect of down-regulation of CK levels on AES may be mediated by altered habit, resulting in improved stress tolerance, which is associated with diminished stress impact on photosynthesis, and changes in source/sink relations. (C) 2014 Elsevier GmbH. All rights reserved.
dcterms:title
Cytokinin oxidase/dehydrogenase overexpression modifies antioxidant defense against heat, drought and their combination in Nicotiana tabacum plants Cytokinin oxidase/dehydrogenase overexpression modifies antioxidant defense against heat, drought and their combination in Nicotiana tabacum plants
skos:prefLabel
Cytokinin oxidase/dehydrogenase overexpression modifies antioxidant defense against heat, drought and their combination in Nicotiana tabacum plants Cytokinin oxidase/dehydrogenase overexpression modifies antioxidant defense against heat, drought and their combination in Nicotiana tabacum plants
skos:notation
RIV/00216208:11310/14:10289134!RIV15-MSM-11310___
n3:aktivita
n14:I n14:S n14:P
n3:aktivity
I, P(GA206/09/2062), P(LD14120), S
n3:cisloPeriodika
17
n3:dodaniDat
n8:2015
n3:domaciTvurceVysledku
n7:5672813
n3:druhVysledku
n18:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
9552
n3:idVysledku
RIV/00216208:11310/14:10289134
n3:jazykVysledku
n13:eng
n3:klicovaSlova
Antioxidant enzymes; Heat; Drought; Cytokinin
n3:klicoveSlovo
n10:Drought n10:Heat n10:Antioxidant%20enzymes n10:Cytokinin
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[BA6C2D8BDC7F]
n3:nazevZdroje
Journal of Plant Physiology
n3:obor
n15:ED
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
5
n3:projekt
n11:LD14120 n11:GA206%2F09%2F2062
n3:rokUplatneniVysledku
n8:2014
n3:svazekPeriodika
171
n3:tvurceVysledku
Vankova, Radomira Dobra, Jana Storchova, Helena Wilhelmova, Nad'a Lubovská, Zuzana
n3:wos
000345632500010
s:issn
0176-1617
s:numberOfPages
9
n17:doi
10.1016/j.jplph.2014.06.021
n4:organizacniJednotka
11310