Salinity has little effect on photosynthetic and respiratory responses to seasonal temperature changes in black mangrove (<i>Avicennia germinans</i>) seedlings

Aspinwall, Michael J.; Faciane, Martina; Harris, Kylie; O'Toole, Madison; Neece, Amy; Jerome, Vrinda; Colón, Mateo; Chieppa, Jeff; Feller, Ilka C.

doi:10.1093/treephys/tpaa107

Cited by 13 publications

(4 citation statements)

References 76 publications

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“…Previous work at SS has also indicated that salinity can be very high during summer (up to 60 ppt) and lower during winter (48 ppt) (Dangremond et al, 2020). Previous studies have found small increases in R with increasing salinity, presumably due to costs associated with maintaining cellular ion gradients (Aspinwall et al, 2021; Lopez‐Hoffman et al, 2007). Thus, the combination of warmer growth temperatures and higher salinity might explain why R increased with T air at SS, and why temperature acclimation appeared constrained.…”

Section: Discussionmentioning

confidence: 93%

“…However, direct measures of leaf R or its temperature sensitivity over space and time are relatively rare for marsh and mangrove species. Only a handful of studies have quantified temperature acclimation of leaf R in mangrove species (see Akaji et al, 2019; Aspinwall et al, 2021) and none have examined temperature acclimation in marsh grasses. As a result, the extent to which temperature acclimation of R leads toward homeostasis of realized (in situ) R over space and time in coastal wetland plants remains unclear.…”

Section: Introductionmentioning

confidence: 99%

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Temperature acclimation of leaf respiration differs between marsh and mangrove vegetation in a coastal wetland ecotone

Sturchio

Chieppa

Chapman

et al. 2021

Global Change Biology

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Temperature acclimation of leaf respiration (R) is an important determinant of ecosystem responses to temperature and the magnitude of temperature‐CO2 feedbacks as climate warms. Yet, the extent to which temperature acclimation of R exhibits a common pattern across different growth conditions, ecosystems, and plant functional types remains unclear. Here, we measured the short‐term temperature response of R at six time points over a 10‐month period in two coastal wetland species (Avicennia germinans [C3 mangrove] and Spartina alterniflora [C4 marsh grass]) growing under ambient and experimentally warmed temperatures at two sites in a marsh–mangrove ecotone. Leaf nitrogen (N) was determined on a subsample of leaves to explore potential coupling of R and N. We hypothesized that both species would reduce R at 25°C (R25) and the short‐term temperature sensitivity of R (Q10) as air temperature (Tair) increased across seasons, but the decline would be stronger in Avicennia than in Spartina. For each species, we hypothesized that seasonal temperature acclimation of R would be equivalent in plants grown under ambient and warmed temperatures, demonstrating convergent acclimation. Surprisingly, Avicennia generally increased R25 with increasing growth temperature, although the Q10 declined as seasonal temperatures increased and did so consistently across sites and treatments. Weak temperature acclimation resulted in reduced homeostasis of R in Avicennia. Spartina reduced R25 and the Q10 as seasonal temperatures increased. In Spartina, seasonal temperature acclimation was largely consistent across sites and treatments resulting in greater respiratory homeostasis. We conclude that co‐occurring coastal wetland species may show contrasting patterns of respiratory temperature acclimation. Nonetheless, leaf N scaled positively with R25 in both species, highlighting the importance of leaf N in predicting respiratory capacity across a range of growth temperatures. The patterns of respiratory temperature acclimation shown here may improve the predictions of temperature controls of CO2 fluxes in coastal wetlands.

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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Temperature acclimation of leaf respiration differs between marsh and mangrove vegetation in a coastal wetland ecotone

Sturchio

Chieppa

Chapman

et al. 2021

Global Change Biology

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“…Specifically, low air temperature (< 20 ℃) significantly reduced photosynthetic capacitythe maximum carboxylation rate and the maximum electron transport rate (Aspinwall et al, 2021); this, in turn, decreased the marginal WUE (ΔAn/ΔE), leading to the downregulation of stomatal conductance, a behavior of mangroves' stomata observed under low temperature conditions (Akaji et al, 2019;Aspinwall et al, 2021). This resulted in the depression of photosynthesis and transpiration during this season.…”

Section: Effects Of Other Factors and Further Model Improvementmentioning

confidence: 98%

Predicting mangrove forest dynamics across a soil salinity gradient using an individual-based vegetation model linked with plant hydraulics

Yoshikai

Nakamura

Suwa

et al. 2021

Preprint

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Abstract. In mangrove forests, soil salinity is one of the most significant environmental factors determining mangrove forest distribution and productivity as it limits plant water uptake and carbon gain. However, salinity control on mangrove productivity through plant hydraulics has not been investigated by existing mangrove models. Thus, we present a new individual-based model linked with plant hydraulics to incorporate physiological characterization of mangrove growth under salt stress. Plant hydraulics was associated with mangroves nutrient uptake and biomass allocation apart from water flux and carbon gain. The developed model was performed for two-coexisting species of Rhizophora stylosa and Bruguiera gymnorrhiza in a subtropical mangrove forest in Japan. The model predicted that the productivity of both species was affected by soil salinity through downregulation of stomatal conductance, while B. gymnorrhiza trees grow faster and suppress the growth of R. stylosa trees by shading that resulted in a B. gymnorrhiza-dominated forest under low soil salinity conditions (< 28 ‰). Alternatively, the increase in soil salinity significantly reduced the productivity of B. gymnorrhiza compared to R. stylosa, leading to an increase in biomass of R. stylosa despite the enhanced salt stress (> 30 ‰). These predicted patterns in forest structures across soil salinity gradient remarkably agreed with field data, highlighting the control of salinity on productivity and tree competition as factors that shape the mangrove forest structures. The model reproducibility of forest structures was also supported by the predicted self-thinning processes, which likewise agreed with field data. In addition, the mangroves morphological adjustment to increasing soil salinity – by decreasing transpiration and increasing hydraulic conductance – was reasonably predicted. Aside from the soil salinity, seasonal dynamics in atmospheric variables (solar radiation and temperature) was highlighted as factors influencing mangrove productivity in a subtropical region. The physiological principle-based improved model has the potential to be extended to other mangrove forests in various environmental settings, thus contributing to a better understanding of mangrove dynamics under future global climate change.

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“…Tonoplast H + ATPase and vacuolar acid phosphatase production increased along with vacuolar volume in Bruguiera sexangula under salt stress which indicates their importance in vacuolar transport of ions ( Mimura et al., 2003 ). A. marina is also known for its peculiarity to adjust salinity by storing inorganic ions in vacuoles and organic solutes in non-vacuolar spaces, but the genes involved are not studied yet ( Aspinwall et al., 2021 ). Similar to these findings, genes involved in Ca 2+ signaling and thus regulating both cell membrane and vacuolar ion transport are upregulated specifically in B. gymnorrhiza leaf tissues ( Miyama and Tada, 2008 ).…”

Section: Genetic and Molecular Basis Of Mangrove Adaptations To Intertidal Environmentsmentioning

confidence: 99%

Genetic and molecular mechanisms underlying mangrove adaptations to intertidal environments

2022

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Mangroves are halophytic plants belonging to diverse angiosperm families that are adapted to highly stressful intertidal zones between land and sea. They are special, unique, and one of the most productive ecosystems that play enormous ecological roles and provide a large number of benefits to the coastal communities. To thrive under highly stressful conditions, mangroves have innovated several key morphological, anatomical, and physio-biochemical adaptations. The evolution of the unique adaptive modifications might have resulted from a host of genetic and molecular changes and to date we know little about the nature of these genetic and molecular changes. Although slow, new information has accumulated over the last few decades on the genetic and molecular regulation of the mangrove adaptations, a comprehensive review on it is not yet available. This review provides up-to-date consolidated information on the genetic, epigenetic, and molecular regulation of mangrove adaptive traits.

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Salinity has little effect on photosynthetic and respiratory responses to seasonal temperature changes in black mangrove (Avicennia germinans) seedlings

Cited by 13 publications

References 76 publications

Temperature acclimation of leaf respiration differs between marsh and mangrove vegetation in a coastal wetland ecotone

Temperature acclimation of leaf respiration differs between marsh and mangrove vegetation in a coastal wetland ecotone

Predicting mangrove forest dynamics across a soil salinity gradient using an individual-based vegetation model linked with plant hydraulics

Genetic and molecular mechanisms underlying mangrove adaptations to intertidal environments

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