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A controlled‐environment chamber for measurement of canopy photosynthesis by small stands of lettuce ( Lactuca sativa L.)
Author(s) -
CAPORN S. J. M.,
WOOD W. A.
Publication year - 1990
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1990.tb01327.x
Subject(s) - lactuca , irradiance , photosynthesis , canopy , environmental science , horticulture , botany , chemistry , analytical chemistry (journal) , atmospheric sciences , environmental chemistry , biology , physics , optics
. A controlled‐environment chamber constructed from a standard chest freezer was used to grow and measure the CO 2 exchange of small stands of lettuce ( Lactuca sativa L. ev. Ambassador). The chamber, with horizontal air flow, provided good control of air temperature ( c. 6 to 16°C), irradiance (0–300 μmol PAR m 2 S 1 and CO 2 (350–1000 μmol mol −1 ). The photosynthetic response to changes in these variables was measured using an inexpensive CO 2 dosing system which recorded the input rate required to maintain a constant concentration of CO 2 (to ± 2.5%). Characteristis of the growth environment and the changes in response to temperature and irradiance are described.