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Publication Type J
Authors Boyd, C. N., V. R. Franceschi, S. D. X. Chuong, H. Akhani, O. Kiirats, M. Smith and G. E. Edwards
Title Flowers of Bienertia cycloptera and Suaeda aralocaspica (Chenopodiaceae) complete the life cycle performing single-cell C-4 photosynthesis
Source Functional Plant Biology
Author Keywords anatomy C-4 plants immunolocalisation kranz anatomy salicornieae chenopodiaceae cotyledons leaves plant ultrastructure evolution features ecology tissues
Abstract Leaves and cotyledons of the terrestrial C-4 plants, Bienertia cycloptera Bunge ex Boiss. and Suaeda aralocaspica (Bunge) Freitag & Schutze (Chenopodiaceae), accomplish C-4 photosynthesis within individual chlorenchyma cells: each species having a unique means of intracellular spatial partitioning of biochemistry and organelles. In this study the chlorenchyma tissue in flowers and stems of these species was investigated. Flowers have an outer whorl of green tepals with a layer of chlorenchyma cells, which are located on the abaxial side, exposed to the atmosphere. Anatomical, immunocytochemical, western blots and starch analyses show that the chlorenchyma cells in tepals are specialised for performance of single-cell C-4 photosynthesis like that in leaves. In the tepals of B. cycloptera, chlorenchyma cells have a distinctive central cytoplasmic compartment, with chloroplasts which contain Rubisco, separated by cytoplasmic channels from a peripheral chloroplast-containing compartment, with phosphoenolpyruvate carboxylase (PEPC) distributed throughout the cytoplasm. In the tepals of S. aralocaspica, chlorenchyma cells have chloroplasts polarised towards opposite ends of the cells. Rubisco is found in chloroplasts towards the proximal end of the cell and PEPC is found throughout the cytoplasm. Also, green stems of B. cycloptera have a single layer of the specialised C-4 type chlorenchyma cells beneath the epidermis, and in stems of S. aralocaspica, chlorenchyma cells are scattered throughout the cortical tissue with chloroplasts around their periphery, typical of C-3 type chlorenchyma. During reproductive development, green flowers become very conspicuous, and their photosynthesis is suggested to be important in completion of the life cycle of these single-cell C-4 functioning species.
Author Address Washington State Univ, Sch Biol Sci, Pullman, WA 99164 USA. Univ Tehran, Fac Sci, Dept Biol, Tehran, Iran. Edwards, GE (reprint author), Washington State Univ, Sch Biol Sci, Pullman, WA 99164 USA. edwardsg@wsu.edu
ISSN 1445-4408
ISBN 1445-4408
29-Character Source Abbreviation Funct. Plant Biol.
Year Published 2007
Volume 34
Issue 4
Beginning Page 268-281
Digital Object Identifier (DOI) 10.1071/fp06283
Unique Article Identifier WOS:000245801000003
Plants associated with this reference

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