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Statements

Subject Item
n2:RIV%2F67179843%3A_____%2F12%3A00379292%21RIV13-GA0-67179843
rdf:type
n8:Vysledek skos:Concept
dcterms:description
While downward photosynthetic acclimation in response to elevated CO2 (EC) is frequently accompanied by reduction in Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase), the exact mechanism behind this decrease and its dynamics are not well understood. We comprehensively studied Rubisco adjustment to EC in coniferous Picea abies using an electrophoretic (protein content), spectrophotometric (initial (RAinitial) and total (RAtotal) in vitro Rubisco activities), and gas-exchange (maximum carboxylation activity in vivo (VCmax)) techniques. With respect to differing carbon sink strength and nitrogen remobilization, we hypothesized greater acclimation of photosynthesis in one-year-old as compared to current-year needles and at the end than at the beginning of the vegetation season. EC treatment led to a decrease in VCmax values in current-year needles, but the ribulose-1,5-bisphosphate (RuBP)-limited rate of photosynthesis (Jmax) remained unaffected. Indeed, both VCmax and Jmax were reduced by the EC treatment in one-year-old needles. The extent of photosynthetic acclimation in EC plants did not increase, however, during the vegetation season. EC decreased the activation state of Rubisco (RAinitial/RAtotal) by 16% and 5% in current-year and one-year-old needles, respectively (averaged over the growing season). While during spring (short-term effect) EC treatment did not influence the Rubisco content per unit leaf area and decreased its specific activity (activity per unit Rubisco mass) in both needleage classes studied, exposure to EC during the entire vegetation season tended to reduce the Rubisco content while increasing its specific activity. Irrespective of CO2 treatment and needleage, a hyperbolic-decay relationship was observed between Rubisco-specific activity and its content. While downward photosynthetic acclimation in response to elevated CO2 (EC) is frequently accompanied by reduction in Rubisco (ribulose-1,5-bisphosphate carboxylase/oxygenase), the exact mechanism behind this decrease and its dynamics are not well understood. We comprehensively studied Rubisco adjustment to EC in coniferous Picea abies using an electrophoretic (protein content), spectrophotometric (initial (RAinitial) and total (RAtotal) in vitro Rubisco activities), and gas-exchange (maximum carboxylation activity in vivo (VCmax)) techniques. With respect to differing carbon sink strength and nitrogen remobilization, we hypothesized greater acclimation of photosynthesis in one-year-old as compared to current-year needles and at the end than at the beginning of the vegetation season. EC treatment led to a decrease in VCmax values in current-year needles, but the ribulose-1,5-bisphosphate (RuBP)-limited rate of photosynthesis (Jmax) remained unaffected. Indeed, both VCmax and Jmax were reduced by the EC treatment in one-year-old needles. The extent of photosynthetic acclimation in EC plants did not increase, however, during the vegetation season. EC decreased the activation state of Rubisco (RAinitial/RAtotal) by 16% and 5% in current-year and one-year-old needles, respectively (averaged over the growing season). While during spring (short-term effect) EC treatment did not influence the Rubisco content per unit leaf area and decreased its specific activity (activity per unit Rubisco mass) in both needleage classes studied, exposure to EC during the entire vegetation season tended to reduce the Rubisco content while increasing its specific activity. Irrespective of CO2 treatment and needleage, a hyperbolic-decay relationship was observed between Rubisco-specific activity and its content.
dcterms:title
Effect of season, needle age and elevated CO2concentration on photosynthesis and Rubisco acclimation in Picea abies Effect of season, needle age and elevated CO2concentration on photosynthesis and Rubisco acclimation in Picea abies
skos:prefLabel
Effect of season, needle age and elevated CO2concentration on photosynthesis and Rubisco acclimation in Picea abies Effect of season, needle age and elevated CO2concentration on photosynthesis and Rubisco acclimation in Picea abies
skos:notation
RIV/67179843:_____/12:00379292!RIV13-GA0-67179843
n8:predkladatel
n15:ico%3A67179843
n4:aktivita
n10:P n10:I
n4:aktivity
I, P(ED1.1.00/02.0073), P(GAP501/10/0340), P(IAA600870701), P(LM2010007), P(SP/2D1/93/07)
n4:cisloPeriodika
SEP 2012
n4:dodaniDat
n18:2013
n4:domaciTvurceVysledku
n9:5865662 Calfapietra, Carlo n9:3280551 De Angelis, Paolo n9:3692574 n9:1241346 n9:7674864 n9:9057765
n4:druhVysledku
n11:J
n4:duvernostUdaju
n13:S
n4:entitaPredkladatele
n12:predkladatel
n4:idSjednocenehoVysledku
133236
n4:idVysledku
RIV/67179843:_____/12:00379292
n4:jazykVysledku
n19:eng
n4:klicovaSlova
Activation state; Electron transport rate; Norway spruce; Photosynthetic acclimation; Rubisco carboxylation; Rubisco specific activity
n4:klicoveSlovo
n7:Activation%20state n7:Rubisco%20carboxylation n7:Rubisco%20specific%20activity n7:Photosynthetic%20acclimation n7:Electron%20transport%20rate n7:Norway%20spruce
n4:kodStatuVydavatele
FR - Francouzská republika
n4:kontrolniKodProRIV
[456C1CEBB45D]
n4:nazevZdroje
Plant Physiology and Biochemistry
n4:obor
n14:EH
n4:pocetDomacichTvurcuVysledku
8
n4:pocetTvurcuVysledku
9
n4:projekt
n6:IAA600870701 n6:GAP501%2F10%2F0340 n6:ED1.1.00%2F02.0073 n6:LM2010007 n6:SP%2F2D1%2F93%2F07
n4:rokUplatneniVysledku
n18:2012
n4:svazekPeriodika
58
n4:tvurceVysledku
Zitová, Martina Holišová, Petra Hrstka, M. Šprtová, Mirka Calfapietra, Carlo De Angelis, Paolo Marek, Michal V. Urban, Otmar Klem, Karel
n4:wos
000308679800016
s:issn
0981-9428
s:numberOfPages
7
n17:doi
10.1016/j.plaphy.2012.06.023