期刊
TREE PHYSIOLOGY
卷 23, 期 2, 页码 97-108出版社
HERON PUBLISHING
DOI: 10.1093/treephys/23.2.97
关键词
climate change; CO2 concentration; ecophysiology; growth; monoterpenes; Norway spruce; Picea abies; Pinus sylvestris; resin acids; Scots pine; soluble proteins; total phenolics
类别
Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) seedlings were grown for 50 days in growth chambers in an ambient or twice ambient carbon dioxide concentration ([CO2]) at a day/night temperature of 19/12 degreesC or 23/16 degreesC. Although elevated [CO2] (EC) had only slight effects on the growth parameters measured, elevated temperature (ET) increased aboveground dry mass of both species. Among treatments, biomass accumulation of both species was greatest in the combined EC + ET treatment. The EC treatment induced thylakoid swelling and increased numbers of plastoglobuli observed in Scots pine needles. Although EC had little effect on Rubisco protein or N concentration of needles, ET had a large effect on N-containing compounds and enhanced N allocation from I-year-old needles. Terpenoids were more responsive to EC and ET than total phenolics. Generally, terpene concentrations were reduced by EC and increased by ET. Increased terpenoid concentrations in response to ET might be associated with thermotolerance of photosynthesis. In Norway spruce, EC decreased total phenolic concentrations in needles, probably as a result of increased growth. We conclude that, in seedlings of these boreal species, the effects of elevated [CO2] on the studied parameters were small compared with the effects of elevated temperature.
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