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|Title:||Features of Photosynthesis in Haloxylon Species of Chenopodiaceae that are Dominant Plants in Central Asian deserts|
|Authors:||Pyankov, V. I.|
Black Jr., C. C.
Artyusheva, E. G.
Voznesenskaya, E. V.
Ku, M. S. B.
Edwards, G. E.
|Publisher:||Japanese Society of Plant Physiologists|
Oxford University Press (OUP)
|Citation:||Features of Photosynthesis in Haloxylon Species of Chenopodiaceae that are Dominant Plants in Central Asian deserts / V. I. Pyankov, C. C. Black Jr., E. G. Artyusheva et al. // Plant and Cell Physiology. — 1999. — Vol. 40. — Iss. 2. — P. 125-134.|
|Abstract:||Haloxylon aphyllum and H. persicum of Chenopodiaceae are dominant plants in the continental deserts of the Asian Irano-Turanian region. The photosynthetic organs, assimilating shoots and leaf-like cotyledons of these two species were studied to characterize their photosynthetic types. 13C/12C isotope ratios, the cellular anatomy of assimilating organs, primary photosynthetic products, and activities of carbon metabolism enzymes, RUBP carboxylase, PEP carboxylase, malic enzymes, and aspartate aminotransferase, indicate different pathways of CO~2 fixation in the photosynthetic organs. Assimilating shoots had attributes of the C4 photosynthesis entirely, while cotyledons lack Kranz-anatomy and incorporated CO2 via C3 photosynthesis. Cotyledons and seeds had lower δ13C values compared to shoots, consistent with the contribution of C3-like CO2 assimilation. Two pathways of carbon donation to the C3 cycle via decarboxylation of C4 acids in bundle sheath cells are suggested to occur in shoots of Haloxylon. The primary photosynthetic product malate can be utilized through NADP+-malic enzyme which occurs in high activity. NAD+-malic enzyme may contribute to C4 photosynthesis (some aspartate is formed as an initial product, the bundle sheath chloroplasts have some grana, and NAD+-malic enzyme is found in bundle sheath cells of shoots, all criteria for NAD+-malic enzyme type photosynthesis). We propose that organ diversity of CO2 fixation pathway in Haloxylon species is an important factor for their growth, survival and reproduction in continental climate deserts.|
|Keywords:||C3 PHOTOSYNTHESIS CA PHOTOSYNTHESIS|
MALATE DEHYDROGENASE (DECARBOXYLATING)
|metadata.dc.description.sponsorship:||The study was supported in part by a Civilian Research and Development Foundation Grant RB1-264 to V.P., E.A., E.V., G.E., and M.K., a NATO Collaborative Research Grant 970588 to C.C.B., and National Science Foundation Grant IBN 9317756 to G.E.E. V.I. Pyankov would like to thank CIES, Washington for a Fulbright Scholar Research Fellowship and the Department of Biochemistry and Molecular Biology, University of Georgia, Athens for provision of facilities during part of the work.|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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