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Long‐term exposure of Norway spruce, Picea abies (L.) Karst., to ozone in open‐top chambers
Author(s) -
WALLIN G.,
OTTOSSON S.,
SELLDÉN G.
Publication year - 1992
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1992.tb02939.x
Subject(s) - shoot , picea abies , photosynthesis , ozone , stomatal conductance , horticulture , botany , karst , chemistry , beech , biology , paleontology , organic chemistry
SUMMARY Rates of photosynthesis at different concentrations of CO 2 (0–1850 μmol mol −1 ) were measured using one clone of Norway spruce, Picea abies (L.) Karst. exposed to three different concentrations of ozone for four seasons (1985–8) in open‐top chambers. The treatments were non‐filtered air+ozone (NF+), non‐filtered air (NF) and charcoal‐filtered air (CF). The measurements were made on shoots of four different age classes. No significant effects were found on photosynthesis or on leaf conductance to CO 2 in current year shoots. In 1‐ to 3‐yr‐old shoots, leaf conductance to CO 2 and rates of net photosynthesis at both 330 μmol mol −1 CO 2 ( P n 330), and saturating concentrations of CO 2 ( P n max), decreased with increasing shoot age and ozone concentration, although this was only significant for P n 330 in 3‐yr‐old shoots. In current year shoots the intercellular concentration of CO 2 was significantly higher in NF+‐treated shoots compared with CF‐ and NF‐treated shoots, while in the 2‐ and 3‐yr‐old shoots it was significantly higher in NF‐ and NF +‐treated shoots compared with CF‐treated shoots. The carboxylation efficiency significantly decreased in 2‐ and 3‐yr‐old shoots from the NF and NF+ treatments compared with shoots from the CF treatment. The gas phase limitation of photosynthesis decreased with increasing shoot age and ozone concentration.