PMID- 12464577
OWN - NLM
STAT- MEDLINE
DCOM- 20030505
LR  - 20190513
IS  - 0829-318X (Print)
IS  - 0829-318X (Linking)
VI  - 22
IP  - 17
DP  - 2002 Dec
TI  - Impact of needle age on the response of respiration in Scots pine to long-term 
      elevation of carbon dioxide concentration and temperature.
PG  - 1241-8
AB  - Sixteen 20-year-old Scots pine (Pinus sylvestris L.) trees growing in the field 
      were enclosed in environment-controlled chambers that for 4 years maintained: (1) 
      ambient conditions (CON); (2) elevated atmospheric carbon dioxide concentration 
      [CO2] (ambient + 350 micromol mol-1; EC); (3) elevated temperature (ambient + 2-3 
      degrees C; ET); or (4) elevated [CO2] and temperature (EC+ET). Dark respiration 
      rate, specific leaf area (SLA) and the concentrations of starch and soluble 
      sugars in needles were measured in the fourth year. Respiration rates, on both an 
      area and a mass basis, and SLA decreased in EC relative to CON, but increased in 
      ET and EC+ET, regardless of needle age class. Starch and soluble sugar 
      concentrations for a given needle age class increased in EC, but decreased 
      slightly in ET and EC+ET. Respiration rates and SLA were highest in current-year 
      needles in all treatments, whereas starch and soluble sugar concentrations were 
      highest in 1-year-old needles. Relative to that of older needles, respiration of 
      current-year needles was inhibited less by EC, but increased in response to ET 
      and EC+ET. All treatments enhanced the difference in respiration between 
      current-year and older needles relative to that in CON. Age had a greater effect 
      on needle respiration than any of the treatments. There were no differences in 
      carbohydrate concentration or SLA between needle age classes in response to any 
      treatment. Relative to CON, the temperature coefficient (Q10) of respiration 
      increased slightly in EC, regardless of age, but declined significantly in ET and 
      EC+ET, indicating acclimation of respiration to temperature.
FAU - Zha, Tianshan
AU  - Zha T
AD  - Faculty of Forestry, University of Joensuu, PO Box 111, FIN-80101 Joensuu, 
      Finland. tianshan.zha@forest.joensuu.fi
FAU - Wang, Kai-Yun
AU  - Wang KY
FAU - Ryyppo, Aija
AU  - Ryyppo A
FAU - Kellomaki, Seppo
AU  - Kellomaki S
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Canada
TA  - Tree Physiol
JT  - Tree physiology
JID - 100955338
RN  - 142M471B3J (Carbon Dioxide)
SB  - IM
MH  - Carbohydrate Metabolism
MH  - Carbon Dioxide/physiology
MH  - Cell Respiration/*physiology
MH  - Pinus/metabolism/*physiology
MH  - Plant Leaves/metabolism/*physiology
MH  - Temperature
MH  - Trees/metabolism/*physiology
EDAT- 2002/12/05 04:00
MHDA- 2003/05/06 05:00
CRDT- 2002/12/05 04:00
PHST- 2002/12/05 04:00 [pubmed]
PHST- 2003/05/06 05:00 [medline]
PHST- 2002/12/05 04:00 [entrez]
AID - 10.1093/treephys/22.17.1241 [doi]
PST - ppublish
SO  - Tree Physiol. 2002 Dec;22(17):1241-8. doi: 10.1093/treephys/22.17.1241.