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EFFECTS OF SULPHUR DIOXIDE ON BIOCHEMICAL ACTIVITY AND ULTRASTRURAL ORGANIZATION OF PINE NEEDLED CHOROPLASTS
Author(s) -
MALHOTRA S. S.
Publication year - 1976
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.1469-8137.1976.tb01457.x
Subject(s) - thylakoid , chloroplast , pinus contorta , photosynthesis , ultrastructure , botany , vesicle , pinus <genus> , chemistry , swelling , aqueous solution , biology , biophysics , membrane , biochemistry , chemical engineering , engineering , gene
SUMMARY The effects of aqueous SO 2 on the ultrastructural organization of pine ( Pinus contorta Dougl. var. latifolia Engelm.) chloroplasts and on their photosynthetic activity were determined under laboratory conditions. At aqueous concentrations of 100 and 500 ppm, SO 2 caused swelling of thylakoid discs and disintegrated other intrachloroplast membranes, resulting in the formation of small vesicles (in older, matured tissues). Chloroplast structural injury was more pronounced in old tissues than in younger and more metabolically active tissues. The biochemical observations (Hill reaction activity) made on chloroplasts isolated from SO 2 ‐treated pine needle segments are in good agreement with the cytological observations.