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Features of Photosynthesis in Haloxylon species of Chenopodiaceae that are Dominant Plants in Central Asian Deserts |
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| Authors: | Pyankov Vladimir I; Black Clanton C Jr; Artyusheva Elena G; Voznesenskaya Elena V; Ku Maurice SB; Edwards Gerald E |
| Institution: | 1 Department of Plant Physiology, Urals State University Lenin Avenue 51, 620083 Ekaterinburg, Russia 2 Department of Biochemistry and Molecular Biology, University of Georgia Athens, GA 30602, U.S.A. 3 Morphology and Anatomy Department, Komarov Botanical Institute RAS Prof. Popov Street 2, 197376 St. Petersburg, Russia 4 Botany Department, Washington State University Pullman, WA 99164-4238, U.S.A. |
| Abstract: | Haloxylon aphyllum and H. persicum of Chenopodiaceae are dominantplants in the continental deserts of the Asian Irano-Turanianregion. The photosynthetic organs, assimilating shoots and leaf-likecotyledons of these two species were studied to characterizetheir photosynthetic types. 13C/12C isotope ratios, the cellularanatomy of as similating organs, primary photosynthetic products,and activities of carbon metabolism enzymes, RUBP carboxylase,PEP carboxylase, malic enzymes, and aspartate aminotransferase,indicate different pathways of CO2 fixation in the photosyntheticorgans. Assimilating shoots had attributes of the C4 photosynthesisentirely, while cotyledons lack Kranz-anatomy and incorporatedCO2 via C3 photosynthesis. Cotyledons and seeds had lower |
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