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PHOTOSYNTHESIS AND RESPIRATION OF ARCEUTHOBIUM TSUGENSE (LORANTHACEAE)
Author(s) -
Miller J. Roger,
Tocher R. D.
Publication year - 1975
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1975.tb14112.x
Subject(s) - biology , photosynthesis , respiration , botany , shoot , loranthaceae , carbon fixation , horticulture
Dark respiration rates of the aerial shoots of Arceuthobium tsugense , obtained by manometric and IRGA techniques, show production of CO 2 to range between 155–300 μl CO 2 g ‐1 hr ‐1 with evidence of seasonal variation. Experiments with 14 CO 2 indicate that the aerial shoots are capable of some photosynthetic CO 2 fixation, with 10–15 % of the available 14 C incorporated by the plant tissue in one hr. Biochemical characterization of the products of photosynthesis reveals that 80–90 % of the incorporated 14 C is ethanol soluble. Ten percent of the ethanol soluble fraction is lipoidal in nature, the rest is H 2 O soluble. IRGA experiments indicate an apparent photosynthetic CO 2 fixation capacity of 80–90 μl CO 2 g ‐1 hr ‐1 , or 25–30% of the amount of CO 2 produced by respiration. The significance of these findings is discussed with respect to nutrition of the parasite and effects upon the host.