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Effect of season, needle age and elevated CO(2) concentration on photosynthesis and Rubisco acclimation in Picea abies.
MedLine Citation:
PMID:  22819860     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
While downward photosynthetic acclimation in response to elevated CO(2) (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 (RA(initial)) and total (RA(total)) in vitro Rubisco activities), and gas-exchange (maximum carboxylation activity in vivo (V(Cmax))) 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 V(Cmax) values in current-year needles, but the ribulose-1,5-bisphosphate (RuBP)-limited rate of photosynthesis (J(max)) remained unaffected. Indeed, both V(Cmax) and J(max) 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 (RA(initial)/RA(total)) 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 needle age classes studied, exposure to EC during the entire vegetation season tended to reduce the Rubisco content while increasing its specific activity. Irrespective of CO(2) treatment and needle age, a hyperbolic-decay relationship was observed between Rubisco-specific activity and its content.
Authors:
Otmar Urban; Miroslav Hrstka; Martina Zitová; Petra Holišová; Mirka Sprtová; Karel Klem; Carlo Calfapietra; Paolo De Angelis; Michal V Marek
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-5
Journal Detail:
Title:  Plant physiology and biochemistry : PPB / Societe francaise de physiologie vegetale     Volume:  58C     ISSN:  1873-2690     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882449     Medline TA:  Plant Physiol Biochem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  135-141     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Masson SAS.
Affiliation:
Global Change Research Centre, Division of Impact Studies and Physiological Analyses, Bělidla 4a, CZ-60300 Brno, Czech Republic.
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