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Statements

Subject Item
n2:RIV%2F61389030%3A_____%2F13%3A00423949%21RIV14-MSM-61389030
rdf:type
skos:Concept n16:Vysledek
rdfs:seeAlso
http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=CCC&DestLinkType=FullRecord&UT=000329007000002
dcterms:description
The roles of proline and polyamines (PAs) in the drought stress responses of tobacco plants were investigated by comparing the responses to drought alone and drought in combination with heat in the upper and lower leaves and roots of wild-type tobacco plants and transformants that constitutively over-express a modified gene for the proline biosynthetic enzyme Delta 1-pyrroline-5-carboxylate synthetase (P5CSF129A; EC 2.7.2.11/1.2.1.41). In both genotypes, drought stress coincided with a decrease in relative water content (RWC) that was much less severe in the upper leaves than elsewhere in the plant. The drought also increased proline levels in both genotypes. A brief period of heat stress (2 h at 40 degrees C) at the end of the drought period did not significantly influence the proline levels in the upper leaves and roots but caused a further increase in the lower leaves of both genotypes. The rate at which these elevated proline levels returned to normal during the post-stress recovery period was slower in the transformants and plants that had been subjected to the combined stress. In both genotypes, drought stress significantly reduced the levels of spermidine (Spd) and putrescine (Put) in the leaves and roots relative to those for controls, and increased the levels of spermine (Spm) and diaminopropane (Dap, formed by the oxidative deamination of Spd and Spm). Spd levels may have declined due to its consumption in Spm biosynthesis and/or oxidation by polyamine oxidase (PAO; EC 1.5.3.11) to form Dap, which became more abundant during drought stress. During the rewatering period, the plants' Put and Spd levels recovered quickly and the activity of the PA biosynthesis enzymes in their leaves and roots increased substantially; this increase was more pronounced in transformants than WT plants. The high levels of Spm observed in drought stressed plants persisted even after the 24 h recovery and rewatering phase. The roles of proline and polyamines (PAs) in the drought stress responses of tobacco plants were investigated by comparing the responses to drought alone and drought in combination with heat in the upper and lower leaves and roots of wild-type tobacco plants and transformants that constitutively over-express a modified gene for the proline biosynthetic enzyme Delta 1-pyrroline-5-carboxylate synthetase (P5CSF129A; EC 2.7.2.11/1.2.1.41). In both genotypes, drought stress coincided with a decrease in relative water content (RWC) that was much less severe in the upper leaves than elsewhere in the plant. The drought also increased proline levels in both genotypes. A brief period of heat stress (2 h at 40 degrees C) at the end of the drought period did not significantly influence the proline levels in the upper leaves and roots but caused a further increase in the lower leaves of both genotypes. The rate at which these elevated proline levels returned to normal during the post-stress recovery period was slower in the transformants and plants that had been subjected to the combined stress. In both genotypes, drought stress significantly reduced the levels of spermidine (Spd) and putrescine (Put) in the leaves and roots relative to those for controls, and increased the levels of spermine (Spm) and diaminopropane (Dap, formed by the oxidative deamination of Spd and Spm). Spd levels may have declined due to its consumption in Spm biosynthesis and/or oxidation by polyamine oxidase (PAO; EC 1.5.3.11) to form Dap, which became more abundant during drought stress. During the rewatering period, the plants' Put and Spd levels recovered quickly and the activity of the PA biosynthesis enzymes in their leaves and roots increased substantially; this increase was more pronounced in transformants than WT plants. The high levels of Spm observed in drought stressed plants persisted even after the 24 h recovery and rewatering phase.
dcterms:title
Effect of drought and combined drought and heat stress on polyamine metabolism in proline-over-producing tobacco plants Effect of drought and combined drought and heat stress on polyamine metabolism in proline-over-producing tobacco plants
skos:prefLabel
Effect of drought and combined drought and heat stress on polyamine metabolism in proline-over-producing tobacco plants Effect of drought and combined drought and heat stress on polyamine metabolism in proline-over-producing tobacco plants
skos:notation
RIV/61389030:_____/13:00423949!RIV14-MSM-61389030
n16:predkladatel
n17:ico%3A61389030
n3:aktivita
n15:P n15:Z
n3:aktivity
P(GA206/09/2062), P(OC08013), Z(AV0Z50380511)
n3:cisloPeriodika
2013
n3:dodaniDat
n8:2014
n3:domaciTvurceVysledku
n7:6225578 n7:9744886 n7:3050270 n7:1304372
n3:druhVysledku
n13:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n9:predkladatel
n3:idSjednocenehoVysledku
71476
n3:idVysledku
RIV/61389030:_____/13:00423949
n3:jazykVysledku
n12:eng
n3:klicovaSlova
Drought; Heat stress; Polyamines
n3:klicoveSlovo
n10:Heat%20stress n10:Drought n10:Polyamines
n3:kodStatuVydavatele
FR - Francouzská republika
n3:kontrolniKodProRIV
[8D6F1AF7B882]
n3:nazevZdroje
Plant Physiology and Biochemistry
n3:obor
n18:ED
n3:pocetDomacichTvurcuVysledku
4
n3:pocetTvurcuVysledku
4
n3:projekt
n14:GA206%2F09%2F2062 n14:OC08013
n3:rokUplatneniVysledku
n8:2013
n3:svazekPeriodika
73
n3:tvurceVysledku
Gemperlová, Lenka Martincová, Olga Cvikrová, Milena Vaňková, Radomíra
n3:wos
000329007000002
n3:zamer
n5:AV0Z50380511
s:issn
0981-9428
s:numberOfPages
9
n19:doi
10.1016/j.plaphy.2013.08.005