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Authors Freitag, H; Stichler, W
Author Full Name Freitag, H; Stichler, W
Title Bienertia cycloptera Bunge ex Boiss., Chenopodiaceae, another C-4 plant without Kranz tissues
Source PLANT BIOLOGY
Language English
Document Type Article
Author Keywords Bienertia; Borszczowia; Chenopodiaceae; C-4 plants; facultative C-4/C-3 plants; C-3/C-4 intermediates; Kranz anatomy; carbon isotope ratio; delta C-13 values
Keywords Plus CARBON-ISOTOPE DISCRIMINATION; PHOTOSYNTHESIS; ASIA
Abstract Following up an earlier study on Borszczowia aralocaspica, a second C-4 leaf type without Kranz tissues is described from Bienertia cycloptera Bunge ex Boiss. The species belongs also to tribe Suaedeae and grows in similar temporarily wet saline habitats in southwestern C Asia. Like Borszczowia, the species has the ability to perform C-4 photosynthesis in single chlorenchyma cells but the cytological compartmentation differs. Evidence is cited from anatomy (cytoplasmic compartmentation, starch formation), from carbon isotope composition and from indirect sources. It is documented by micrographs and delta(13)C Values (mean - 14.7parts per thousand). Variations of the delta(13)C values subsequently found in newly formed leaves of the same greenhouse plants (- 15.5 to - 21.1parts per thousand) support the hypothesis that Bienertia is a facultative C-4/C-3 species. The new described bienertioid leaf type differs from the leaves Of C-3 species in Suaeda by strict separation of the mesophyll into a central aqueous tissue without chloroplasts and a peripheral 1-3 layered chlorenchyma with elaborate cytoplasmic compartmentation. Each cell of the latter contains a peripheral cytoplasmic layer with scattered chloroplasts and a large globular cytoplasmic body located in the central vacuole which is densely packed with starch producing chloroplasts, and joined by the nucleus. Comparative studies on different leaves of the same individuals of ordinary C-4 species demonstrated a remarkable range of variation, from 1.0%. in Salsola tragus up to 2.5parts per thousand in Petrosimonia sibirica. This corresponds well with the variance in data from different individuals and populations. For explaining the larger interspecific variation from about 23 other species of Salsoloideae, the hypothesis is developed that in species or groups of taxa specific leakages of their C-4 systems do occur. By three characters unique in tribe Suaedeae and detected during the study, Bienertia is confirmed as well separated from Suaeda and as a monotypic genus.
Author Address Univ Kassel, D-34132 Kassel, Germany; GSF, Forschungszentrum, Inst Hydrol, Neuherberg, Germany
Reprint Address Freitag, H (corresponding author), Univ Kassel, D-34132 Kassel, Germany.
Times Cited 43
Total Times Cited Count (WoS, BCI, and CSCD) 48
Publisher GEORG THIEME VERLAG KG
Publisher City STUTTGART
Publisher Address RUDIGERSTR 14, D-70469 STUTTGART, GERMANY
ISSN 1435-8603
29-Character Source Abbreviation PLANT BIOLOGY
ISO Source Abbreviation Plant Biol.
Publication Date JAN
Year Published 2002
Volume 4
Issue 1
Beginning Page 121
Ending Page 131
Digital Object Identifier (DOI) 10.1055/s-2002-20444
Page Count 11
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number 530UQ
Unique Article Identifier WOS:000174377700017
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