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Statements

Subject Item
n2:RIV%2F61389030%3A_____%2F13%3A00422266%21RIV14-GA0-61389030
rdf:type
n5:Vysledek skos:Concept
dcterms:description
Numerous studies have shown effects of abscisic acid (ABA) on nuclear genes encoding chloroplast-localized proteins. ABA effects on the transcription of chloroplast genes, however, have not been investigated yet thoroughly. This work, therefore, studied the effects of ABA (75 M) on transcription and steady-state levels of transcripts in chloroplasts of basal and apical segments of primary leaves of barley (Hordeum vulgare L.). Basal segments consist of young cells with developing chloroplasts, while apical segments contain the oldest cells with mature chloroplasts. Exogenous ABA reduced the chlorophyll content and caused changes of the endogenous concentrations not only of ABA but also of cytokinins to different extents in the basal and apical segments. It repressed transcription by the chloroplast phage-type and bacteria-type RNA polymerases and lowered transcript levels of most investigated chloroplast genes drastically. ABA did not repress the transcription of psbD and a few other genes and even increased psbD mRNA levels under certain conditions. The ABA effects on chloroplast transcription were more pronounced in basal vs. apical leaf segments and enhanced by light. Simultaneous application of cytokinin (22 M 6-benzyladenine) minimized the ABA effects on chloroplast gene expression. These data demonstrate that ABA affects the expression of chloroplast genes differentially and points to a role of ABA in the regulation and coordination of the activities of nuclear and chloroplast genes coding for proteins with functions in photosynthesis. Numerous studies have shown effects of abscisic acid (ABA) on nuclear genes encoding chloroplast-localized proteins. ABA effects on the transcription of chloroplast genes, however, have not been investigated yet thoroughly. This work, therefore, studied the effects of ABA (75 M) on transcription and steady-state levels of transcripts in chloroplasts of basal and apical segments of primary leaves of barley (Hordeum vulgare L.). Basal segments consist of young cells with developing chloroplasts, while apical segments contain the oldest cells with mature chloroplasts. Exogenous ABA reduced the chlorophyll content and caused changes of the endogenous concentrations not only of ABA but also of cytokinins to different extents in the basal and apical segments. It repressed transcription by the chloroplast phage-type and bacteria-type RNA polymerases and lowered transcript levels of most investigated chloroplast genes drastically. ABA did not repress the transcription of psbD and a few other genes and even increased psbD mRNA levels under certain conditions. The ABA effects on chloroplast transcription were more pronounced in basal vs. apical leaf segments and enhanced by light. Simultaneous application of cytokinin (22 M 6-benzyladenine) minimized the ABA effects on chloroplast gene expression. These data demonstrate that ABA affects the expression of chloroplast genes differentially and points to a role of ABA in the regulation and coordination of the activities of nuclear and chloroplast genes coding for proteins with functions in photosynthesis.
dcterms:title
Abscisic acid represses the transcription of chloroplast genes Abscisic acid represses the transcription of chloroplast genes
skos:prefLabel
Abscisic acid represses the transcription of chloroplast genes Abscisic acid represses the transcription of chloroplast genes
skos:notation
RIV/61389030:_____/13:00422266!RIV14-GA0-61389030
n5:predkladatel
n18:ico%3A61389030
n3:aktivita
n7:Z n7:P
n3:aktivity
P(GA522/09/2058), Z(AV0Z50380511)
n3:cisloPeriodika
14
n3:dodaniDat
n19:2014
n3:domaciTvurceVysledku
n4:9744886
n3:druhVysledku
n11:J
n3:duvernostUdaju
n9:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
59240
n3:idVysledku
RIV/61389030:_____/13:00422266
n3:jazykVysledku
n17:eng
n3:klicovaSlova
Abscisic acid (ABA); chloroplast; cytokinin
n3:klicoveSlovo
n6:cytokinin n6:Abscisic%20acid%20%28ABA%29 n6:chloroplast
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[4D7ABDC2C583]
n3:nazevZdroje
Journal of Experimental Botany
n3:obor
n12:ED
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
6
n3:projekt
n20:GA522%2F09%2F2058
n3:rokUplatneniVysledku
n19:2013
n3:svazekPeriodika
64
n3:tvurceVysledku
Kulaeva, O.N. Vaňková, Radomíra Zubo, Y.O. Yamburenko, M. V. Kusnetsov, V. Borner, T.
n3:wos
000326724700028
n3:zamer
n16:AV0Z50380511
s:issn
0022-0957
s:numberOfPages
12
n15:doi
10.1093/jxb/ert258