Feature of Photosynthesis in Haloxylon species of Chenopodiaceae that are Dominant Plants in Central Asian Deserts

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概要

• 論文の詳細を見る

• 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. ^<13>C/^<12>C 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 C_4 photosynthesis entirely, while cotyledons lack Kranz-anatomy and incorporated CO_2 via C_3 photosynthesis. Cotyledons and seeds had lower δ^<13>C values compared to shoots, consistent with the contribution of C_3-like CO_2 assimilation. Two pathways of carbon donation to the C_3 cycle via decarboxylation of C_4 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 C_4 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 CO_2 fixation pathway in Haloxylon species is an important factor for their growth, survival and reproduction in continental climate deserts.

• 日本植物生理学会の論文

著者

• Ku Maurice

  Botany Dep. Washington State Univ.

• Edwards Gerald

  Botany Department And Institute Of Biological Chemistry Washington State University

• Black Jr.

  Department Of Biochemistry And Molecular Biology University Of Georgia

• Pyankov Vladimir

  Department of Plant Physiology, Urals State University

• Artyusheva Elena

  Department of Plant Physiology, Urals State University

• Voznesenskaya Elena

  Morphology and Anatomy Department, Komarov Botanical Institute RAS

• Pyankov Vladimir

  Department Of Plant Physiology Urals State University

• Artyusheva Elena

  Department Of Plant Physiology Urals State University

• Voznesenskaya Elena

  Morphology And Anatomy Department Komarov Botanical Institute Ras

関連論文

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• Feature of Photosynthesis in Haloxylon species of Chenopodiaceae that are Dominant Plants in Central Asian Deserts
• Localization of Carbonic Anhydrase in Mesophyll Cells of Terrestrial C_3 Plants in Relation to CO_2 Assimilation
• Quantity and Kinetic Properties of Ribulose 1,5-Bisphosphate Carboxylase in C_3, C_4, and C_3-C_4 Intermediate Species of Flaveria (Asteraceae)
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