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Publication Type J
Authors Redondo, S., A. E. Rubio-Casal, J. M. Castillo, C. J. Luque, A. A. Alvarez, T. Luque and M. E. Figueroa
Title Influences of salinity and light on germination of three Sarcocornia taxa with contrasted habitats
Source Aquatic Botany
Author Keywords hybrid; Iberian Peninsula; Mediterranean salt marsh; Sarcocornia fruticosa; Sarcocornia perennis; seed viability mediterranean salt marshes; seed-germination; southeastern spain; facilitation; populations; nucleation; succession; halophytes; responses; maritima
Abstract We analysed the responses of seeds of three closely related halophytic taxa of the genus Sarcocornia in contrasted habitats, Sarcocornia perennis (low marsh), Sarcocornia fruticosa (high marsh) and S. perennis x fruticosa (middle marsh), to different salinity concentrations (0, 2, 4 and 6%) and light regime (light/dark and dark). Germination reflected their position in the tidal gradient, showing higher percentages at hypersalinity those taxa colonising upper positions (c. 40%). S. fruticosa showed germination in darkness and it accelerated its germination after prolonged salinity exposure. S. perennis x fruticosa presented intermediate responses, sharing the capacity of germinating in hypersaline conditions with S. fruticosa and the absence of germination in darkness and the absence of acceleration of germination with S. perennis. Finally, we recorded common germination behaviours for the three taxa: short germination periods, reduction of final germination percentage, enforcing of seed dormancy and reduction of seed viability by increasing salinity. Germination responses to salinity of the three Sarcocornia seem likely to influence their colonisation capacities down the tidal gradient and hence may be important in the maintenance of taxa zonation in salt marshes. (C) 2004 Elsevier B.V. All rights reserved.
Author Address Univ Sevilla, Fac Biol, Dept Biol Vegetal & Ecol, Apartado 1095, E-41080 Seville, Spain Univ Sevilla, Fac Biol, Dept Biol Vegetal & Ecol, E-41080 Seville, Spain Univ Huelva, Fac Ciencias Expt, Dept Biol Ambiental & Salud Publ, Huelva 21071, Spain Redondo S Univ Sevilla, Fac Biol, Dept Biol Vegetal & Ecol, Apartado 1095, E-41080 Seville, Spain
29-Character Source Abbreviation Aquat. Bot.
Publication Date Mar
Year Published 2004
Volume 78
Issue 3
Beginning Page 255-264
Unique Article Identifier ISI:000220269500005
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