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Publication Type J
Authors Gallego-Tevar, B., P. Peinado-Torrubia, R. Alvarez, B. J. Grewell and J. M. Castillo
Title From physiology to salt marsh management challenges with sea level rise: the case of native Spartina foliosa, invasive S. densiflora and their hybrid
Source Conservation Physiology
Author Keywords environmental stress hybrid inundation PEPC polyploid salinity transgressive traits protein-serine kinase san-francisco bay phosphoenolpyruvate carboxylase pacific coast photosynthetic responses chlorophyll fluorescence phenotypic plasticity light activation humboldt bay cordgrass
Abstract Sea level rise (SLR) imposes increasing salinity and inundation stresses in salt marshes which simultaneously face invasions by exotic plant species. We aimed to improve and apply knowledge on the ecophysiological responses of halophytes to SLR to conservation management of salt marshes. In a mesocosm experiment, we measured and compared phosphoenolpyruvate carboxylase (PEPC) activity and related functional traits of the California-native Spartina foliosa, invasive S. densiflora and their hybrid S. densiflora x foliosa in response to increasing levels of salinity and inundation. S. foliosa was moderately sensitive to salinity, showing a 57% reduction in PEPC specific activity from freshwater to hypersalinity. This native species compensated for the reduction of PEPC activity with increased salinity through 80% higher enzyme activation by phosphorylation. PEPC functional trait responses of S. foliosa were mostly independent of inundation depth. In view of these results, managers should conserve undeveloped lands for accommodation space above current high tide lines to facilitate colonization of stress-tolerant S. foliosa. Our results on functional responses of PEPC traits recorded high sensitivity to salinity for S. densiflora. This was reflected by 65% lower PEPC specific activity together with increasing accumulation of free proline (+96%) and total proteins (+23%) with elevated salinity. These results suggest prioritized eradication of S. densiflora populations in brackish habitats. Measured PEPC responses support the high stress tolerance of the S. densiflora x foliosa hybrid. PEPC traits for the hybrid were mostly independent of salinity and inundation. The hybrid showed higher PEPC-specific activity than S. foliosa (+70%) and S. densiflora (+15%) in freshwater under intermediate inundation. Results suggest that eradication of the hybrid should be the highest management priority. Our study shows that the responses of key functional physiological traits to environmental stresses serve as biological indicators that can guide ecosystem management practices in a scenario of climate change.
Author Address [Gallego-Tevar, Blanca; Peinado-Torrubia, Procopio; Alvarez, Rosario; Castillo, Jesus M.] Univ Seville, Dept Biol Vegetal & Ecol, Ap 1095, Seville 41080, Spain. [Grewell, Brenda J.] Univ Calif Davis, USDA ARS, Invas Species & Pollinator Hlth Res Unit, Dept Plant Sci, MS 4,1 Shields Ave, Davis, CA 95616 USA. Castillo, JM (corresponding author), Univ Seville, Dept Biol Vegetal & Ecol, Ap 1095, Seville 41080, Spain. manucas@us.es
ISSN 2051-1434
ISBN 2051-1434
29-Character Source Abbreviation Conserv. Physiol.
Publication Date Jun
Year Published 2020
Volume 8
Digital Object Identifier (DOI) 10.1093/conphys/coaa053
Unique Article Identifier WOS:000544738200001
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