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SYSTEMATICS OF PHOTOSYNTHETIC CARBON FIXATION PATHWAYS IN EUPHORBIA
Author(s) -
Webster Grady L.,
Brown Walter V.,
Smith Bruce N.
Publication year - 1975
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.2307/1218995
Subject(s) - crassulacean acid metabolism , subgenus , botany , biology , photosynthesis , carbon fixation , systematics , taxon , genus , taxonomy (biology)
Summary Using the technique of carbon isotopic ratio determinations, 20 selected species of Euphorbia (s. lat.) have been investigated to determine their metabolic status. Previous work is reviewed, and as found by previous investigators, enriched 13 C values ‐ indicating Crassulacean acid metabolism or C 4 photosynthesis ‐ have been detected only in subgenera Euphorbia and Chamaesyce , respectively. All taxa investigated in subg. Chamaesyce except two species of subsect. Acutae show the Kranz syndrome and C 4 photosynthesis; the probable phylogenetic origin of the subgenus is therefore pinpointed within this subsection. Apparently taxa with Crassulacean acid metabolism and C 4 photosynthesis have arisen independently within the genus.

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