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Field Studies of Photosynthesis as Affected by Water Stress, Temperature, and Light in Birch
Author(s) -
HARI PERTTI,
LUUKKANEN OLAVI
Publication year - 1974
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1974.tb03734.x
Subject(s) - photosynthesis , water stress , light intensity , stress (linguistics) , botany , drought stress , environmental science , chemistry , atmospheric sciences , biology , physics , optics , linguistics , philosophy
This study continues the investigations previously conducted as laboratory experiments. The results from the present study confirm our earlier observations made on alder seedlings concerning the effect of water stress, temperature and light on the net uptake of CO 2 . A variable that we could call the physiological water stress is proposed as a measure of the intrinsic factor of photosynthesis during and after drought. A physiological water stress builds up and discharges slowly and interacts strongly with temperature. Our model for the effects of physiological water stress, temperature, and light intensity explains satisfactorily the net uptake of CO 2 in birch in the field. Thus, our earlier results concerning the effects of physiological water stress on photosynthesis are not artifacts generated by the unnatural laboratory environment.