Physiological and Growth Responses of Seashore Paspalum to Salinity

in HortScience
Authors:
C. H. PeacockOrnamental Horticulture Department, IFAS, University of Florida, Gainesville, FL 32611

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A. E. DudeckOrnamental Horticulture Department, IFAS, University of Florida, Gainesville, FL 32611

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Abstract

Two cultivars of Seashore Paspalum (Paspalum vaginatum Swartz.), ‘Adalayd’ (‘Excaliber’) and ‘FSP-1’, were grown in solution culture at 6 levels of salinity derived from synthetic sea water. Cultivars differed in changes of leaf water potential, leaf water potential components, and in growth responses to increased salinity. ‘Adalayd’ exhibited a linear decrease whereas ‘FSP-1’ exhibited a quadratic decrease in leaf water potential with increasing salinity. Leaf osmotic potentials decreased linearly for both cultivars, but there was a significant interaction. Leaf turgor potential decreased linearly for ‘Adalayd’ but quadratically for ‘FSP-1’. ‘FSP-1’ had greater tolerance to salinity in solution culture than Adalayd.

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Received for publication 6 June 1984. Florida Agricultural Experiment Station Journal Series No. 5627. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement tsolely to indicate this fact.

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