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Publication Type J
Authors Colmer, T. D., H. Vos and O. Pedersen
Title Tolerance of combined submergence and salinity in the halophytic stem-succulent Tecticornia pergranulata
Source Annals of Botany
Author Keywords HALOSARCIA-PERGRANULATA SALT-MARSH SALICORNIA-EUROPAEA PLANT ZONATION SOIL AERATION GROWTH INUNDATION PHOTOSYNTHESIS CHENOPODIACEAE ELONGATION
Abstract Habitats occupied by many halophytes are not only saline, but are also prone to flooding. Few studies have evaluated submergence tolerance in halophytes. Responses to submergence, at a range of salinity levels, were studied for the halophytic stem-succulent Tecticornia pergranulata subsp. pergranulata (syn. Halosarcia pergranulata subsp. pergranulata). Growth and total sugars in succulent stems were assessed as a function of time after submergence. Underwater net photosynthesis, dark respiration, total sugars, glycinebetaine, Na+, Cl- and K+, in succulent stems, were assessed in a NaCl dose-response experiment. Submerged plants ceased to grow, and tissue sugars declined. Photosynthesis by succulent stems was reduced markedly when underwater, as compared with in air. Capacity for underwater net photosynthesis (P-N) was not affected by 10-400 mm NaCl, but it was reduced by 30 % at 800 mm. Dark respiration, underwater, increased in succulent stems at 200-800 mm NaCl, as compared with those at 10 mm NaCl. On an ethanol-insoluble dry mass basis, K+ concentration in succulent stems of submerged plants was equal to that in drained controls, across all NaCl treatments. Na+ and Cl- concentrations, however, were elevated in stems of submerged plants, but so was glycinebetaine. Submerged stems increased in succulence, so solutes would have been 'diluted' on a tissue-water basis. Tecticornia pergranulata tolerates complete submergence, even in waters of high salinity. A 'quiescence response', i.e. no shoot growth, would conserve carbohydrates, but tissue sugars still declined with time. A low K+ : Na+ ratio, typical for tissues of succulent halophytes, was tolerated even during prolonged submergence, as evidenced by maintenance of underwater P-N at up to 400 mm NaCl. Underwater P-N provides O-2 and sugars, and thus should enhance survival of submerged plants.
Author Address [Colmer, T. D.; Vos, H.; Pedersen, O.] Univ Western Australia, Fac Nat & Agr Sci, Sch Plant Biol, Crawley, WA 6009, Australia. [Vos, H.] Univ Utrecht, Fac Biol, NL-3584 CA Utrecht, Netherlands. [Pedersen, O.] Univ Copenhagen, Freshwater Biol Lab, Inst Biol, DK-3400 Hillerod, Denmark. Pedersen, O, Univ Western Australia, Fac Nat & Agr Sci, Sch Plant Biol, 35 Stirling Highway, Crawley, WA 6009, Australia. opedersen@bi.ku.dk
ISSN 0305-7364
ISBN 0305-7364
29-Character Source Abbreviation Ann. Bot.
Publication Date Jan
Year Published 2009
Volume 103
Issue 2
Beginning Page 303-312
Digital Object Identifier (DOI) 10.1093/aob/mcn120
Unique Article Identifier ISI:000262329200016
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