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Publication Type J
Authors Rich, S. M., M. Ludwig and T. D. Colmer
Title Photosynthesis in aquatic adventitious roots of the halophytic stem-succulent Tecticornia pergranulata (formerly Halosarcia pergranulata)
Source Plant Cell and Environment
Author Keywords adventitious roots; aquatic roots; flooding; halophyte; inland salt marsh; root aeration; root photosynthesis; samphire; underwater photosynthesis; waterlogging sediment-water interface; carbon-dioxide fixation; underwater photosynthesis; oxygen dynamics; chlorophyll-a; aerial roots; plants; co2; assimilation; terrestrial
Abstract In flood-tolerant species, a common response to inundation is growth of adventitious roots into the water column. The capacity for these roots to become photosynthetically active has received scant attention. The experiments presented here show the aquatic adventitious roots of the flood-tolerant, halophytic stem-succulent, Tecticornia pergranulata (subfamily Salicornioideae, Chenopodiaceae) are photosynthetic and quantify for the first time the photosynthetic capacity of aquatic roots for a terrestrial species. Fluorescence microscopy was used to determine the presence of chloroplasts within cells of aquatic roots. Net O-2 production by excised aquatic roots, when underwater, was measured with varying light and CO2 regimes; the apparent maximum capacity (P-max) for underwater net photosynthesis in aquatic roots was 0.45 mu mol O-2 m(-2) s(-1). The photosynthetic potential of these roots was supported by the immunolocalization of PsbA, the major protein of photosystem II, and ribulose-1-5-bisphosphate carboxylase/oxygenase (Rubisco) in root protein extracts. Chlorophyllous aquatic roots of T. pergranulata are photosynthetically active, and such activity is a previously unrecognized source of O-2, and potentially carbohydrates, in flooded and submerged plants.
Author Address Univ Western Australia, Fac Nat & Agr Sci, Sch Plant Biol M084, Perth, WA 6009, Australia. Univ Western Australia, Fac Life & Phys Sci, Sch Biomed Biomol & Chem Sci M310, Perth, WA 6009, Australia. Colmer, TD, Univ Western Australia, Fac Nat & Agr Sci, Sch Plant Biol M084, 35 Stirling Highway, Perth, WA 6009, Australia. tdcolmer@cyllene.uwa.edu.au
29-Character Source Abbreviation Plant Cell Environ.
Publication Date Jul
Year Published 2008
Volume 31
Issue 7
Beginning Page 1007-1016
Unique Article Identifier ISI:000256620500010
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