Journal article
Structural, biochemical, and physiological characterization of photosynthesis in two C4 subspecies of Tecticornia indica and the C3 species Tecticornia pergranulata (Chenopodiaceae)
Journal of experimental botany, Vol.59(7), pp.1715-1734
05/2008
Handle:
https://hdl.handle.net/2376/104714
PMID: 18390850
Abstract
Among dicotyledon families, Chenopodiaceae has the most C4 species and the greatest diversity in structural forms of C4. In subfamily Salicornioideae, C4 photosynthesis has, so far, only been found in the genus Halosarcia which is now included in the broadly circumscribed Tecticornia. Comparative anatomical, cytochemical, and physiological studies on these taxa, which have near-aphyllous photosynthetic shoots, show that T. pergranulata is C3, and that two subspecies of T. indica (bidens and indica) are C4 (Kranz-tecticornoid type). In T. pergranulata, the stems have two layers of chlorenchyma cells surrounding the centrally located water storage tissue. The two subspecies of T. indica have Kranz anatomy in reduced leaves and in the fleshy stem cortex. They are NAD-malic enzyme-type C4 species, with mesophyll chloroplasts having reduced grana, characteristic of this subtype. The Kranz-tecticornoid-type anatomy is unique among C4 types in the family in having groups of chlorenchymatous cells separated by a network of large colourless cells (which may provide mechanical support or optimize the distribution of radiation in the tissue), and in having peripheral vascular bundles with the phloem side facing the bundle sheath cells. Also, the bundle sheath cells have chloroplasts in a centrifugal position, which is atypical for C4 dicots. Fluorescence analyses in fresh sections indicate that all non-lignified cell walls have ferulic acid, a cell wall cross-linker. Structural-functional relationships of C4 photosynthesis in T. indica are discussed. Recent molecular studies show that the C4 taxa in Tecticornia form a monophyletic group, with incorporation of the Australian endemic genera of Salicornioideae, including Halosarcia, Pachycornia, Sclerostegia, and Tegicornia, into Tecticornia.
Metrics
8 Record Views
Details
- Title
- Structural, biochemical, and physiological characterization of photosynthesis in two C4 subspecies of Tecticornia indica and the C3 species Tecticornia pergranulata (Chenopodiaceae)
- Creators
- Elena V Voznesenskaya - 1Laboratory of Anatomy and Morphology, V. L. Komarov Botanical Institute of Russian Academy of Sciences, Prof. Popov Street 2, 197376, St Petersburg, RussiaHossein Akhani - 2Department of Plant Sciences, School of Biology, College of Sciences, University of Tehran, PO Box 14155-6455, Tehran, IranNuria K Koteyeva - 1Laboratory of Anatomy and Morphology, V. L. Komarov Botanical Institute of Russian Academy of Sciences, Prof. Popov Street 2, 197376, St Petersburg, RussiaSimon D. X Chuong - 3Department of Biology, University of Waterloo, Waterloo, Ontario N2L 3G1, CanadaEric H Roalson - 4School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USAOlavi Kiirats - 4School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USAVincent R Franceschi - 4School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USAGerald E Edwards - 4School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA
- Publication Details
- Journal of experimental botany, Vol.59(7), pp.1715-1734
- Academic Unit
- Biological Sciences, School of
- Publisher
- Oxford University Press
- Identifiers
- 99900546980201842
- Language
- English
- Resource Type
- Journal article