Carbon isotope composition and leaf anatomy as a tool to characterize the photosynthetic mechanism of Artemisia annua L.
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Data
2005-01-01
Autores
Marchese, José Abramo [UNESP]
Broetto, Fernando [UNESP]
Lin, Chau Ming [UNESP]
Ducatti, Carlos [UNESP]
Rodella, Roberto Antonio [UNESP]
Ventrella, Marília Contin
Rodrigues Gomes, Greice Daiane
De Franceschi, Lúcia
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Resumo
Leaves of Artemisia annua L. are a plentiful source of artemisinin, a drug with proven effectiveness against malaria. The aim of this study was to classify the photosynthetic mechanism of A. annua through studies of the carbon isotope composition (δ 13C) and the leaf anatomy. A. annua presented a δ 13C value of - 31.76 ± 0.07, which characterizes the plants as a typical species of the C3 photosynthethic mechanism, considering that the average δ 13C values for C3 and C4 species are -28 and -14, respectively. The leaf anatomy studies were consistent with the δ 13C results, where, in spite of the existence of parenchymatic cells forming a sheath surrounding the vascular tissue, the cells do not contain chloroplasts or starch. This characteristic is clearly different from that of the Kranz anatomy found in C4 species.
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C3 and C4 plants, Isotope discrimination, Kranz anatomy, Photosynthesis, Artemisia annua
Como citar
Brazilian Journal of Plant Physiology, v. 17, n. 1, p. 187-190, 2005.