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Publication Type J
Authors Aspinwall, M. J., M. Faciane, K. Harris, M. O'Toole, A. Neece, V. Jerome, M. Colon, J. Chieppa and I. C. Feller
Title Salinity has little effect on photosynthetic and respiratory responses to seasonal temperature changes in black mangrove (Avicennia germinans) seedlings
Source Tree Physiology
Author Keywords blue carbon carbon assimilation halophytes stomatal sensitivity thermal acclimation vapor pressure deficit vegetated coastal habitats gas-exchange leaf respiration water relations stomatal sensitivity eucalyptus-globulus thermal-acclimation biochemical-model ion accumulation growth-responses
Abstract Temperature and salinity are important regulators of mangrove range limits and productivity, but the physiological responses of mangroves to the interactive effects of temperature and salinity remain uncertain. We tested the hypothesis that salinity alters photosynthetic responses to seasonal changes in temperature and vapor pressure deficit (D), as well as thermal acclimation _of leaf respiration in black mangrove (Avicennia germinans). To test this hypothesis, we grew seedlings of A. germinans in an outdoor experiment for similar to 12 months under four treatments spanning 0 to 55 ppt porewater salinity. We repeatedly measured seedling growth and in situ rates of leaf net photosynthesis (A(sat)) and stomatal conductance to water vapor (g(s)) at prevailing leaf temperatures, along with estimated rates of Rubisco carboxylation (V-cmax) and electron transport for RuBP regeneration (J(max)), and measured rates of leaf respiration at 25 degrees C (R-area(25)). We developed empirical models describing the seasonal response of leaf gas exchange and photosynthetic capacity to leaf temperature and D, and the response of R-area(25) to changes in mean daily air temperature. We tested the effect of salinity on model parameters. Over time, salinity had weak or inconsistent effects on A(sat), g(s) and R-area(25). Salinity also had little effect on the biochemical parameters of photosynthesis (V-cmax, J(max)) and individual measurements of A(sat), g(s), V-cmax and J(max) showed a similar response to seasonal changes in temperature and D across all salinity treatments. Individual measurements of R-area(25) showed a similar inverse relationship with mean daily air temperature across all salinity treatments. We conclude that photosynthetic responses to seasonal changes in temperature and D, as well as seasonal temperature acclimation of leaf R, are largely consistent across a range of salinities in A. germinans. These results might simplify predictions of photosynthetic and respiratory responses to temperature in young mangroves.
Author Address [Aspinwall, Michael J.; Harris, Kylie; O'Toole, Madison; Neece, Amy; Jerome, Vrinda; Colon, Mateo; Chieppa, Jeff] Univ North Florida, Dept Biol, 1 UNF Dr, Jacksonville, FL 32224 USA. [Aspinwall, Michael J.; Chieppa, Jeff] Auburn Univ, Sch Forestry & Wildlife Sci, 602 Duncan Dr, Auburn, AL 36849 USA. [Faciane, Martina] Rice Univ, Dept Earth Environm & Planetary Sci, 6100 Main St, Houston, TX 77005 USA. [Feller, Ilka C.] Smithsonian Environm Res Ctr, 647 Contees Wharf Rd, Edgewater, MD 21037 USA. Aspinwall, MJ (corresponding author), Univ North Florida, Dept Biol, 1 UNF Dr, Jacksonville, FL 32224 USA.; Aspinwall, MJ (corresponding author), Auburn Univ, Sch Forestry & Wildlife Sci, 602 Duncan Dr, Auburn, AL 36849 USA. aspinwall@auburn.edu
ISSN 0829-318X
ISBN 0829-318X
29-Character Source Abbreviation Tree Physiol.
Publication Date Jan
Year Published 2021
Volume 41
Issue 1
Beginning Page 103-118
Digital Object Identifier (DOI) 10.1093/treephys/tpaa107
Unique Article Identifier WOS:000612199200009

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