Modeling Bryophyte Productivity Across Gradients of Water Availability Using Canopy Form–Function Relationships

Rice, Steven K.; Neal, N. P.; Mango, Jesse; Black, Kelly

doi:10.1017/cbo9780511779701.023

Cited by 8 publications

(6 citation statements)

References 43 publications

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“…Another factor that affects carbon gain of many bryophytes is water availability ( Proctor, 1982 ). Both dehydration and an excessive interstitial water content can inhibit photosynthesis ( Smith, 1982 ; Rice et al, 2011 ; Wagner et al, 2013 ; Supplementary Figure 5 ). Our study confirms that water content also influences the temperatures experienced by Antarctic mosses, with excess water buffering the extremes (decreasing their maximum and increasing their minimum temperatures) and, therefore, reducing the time when mosses experience temperatures higher than 14°C.…”

Section: Discussionmentioning

confidence: 99%

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

et al. 2020

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The terrestrial flora of Antarctica's frozen continent is restricted to sparse ice-free areas and dominated by lichens and bryophytes. These plants frequently battle sub-zero temperatures, extreme winds and reduced water availability; all influencing their ability to survive and grow. Antarctic mosses, however, can have canopy temperatures well above air temperature. At midday, canopy temperatures can exceed 15°C, depending on moss turf water content. In this study, the optimum temperature of photosynthesis was determined for six Antarctic moss species: Bryum pseudotriquetrum, Ceratodon purpureus, Chorisodontium aciphyllum, Polytrichastrum alpinum, Sanionia uncinata, and Schistidium antarctici collected from King George Island (maritime Antarctica) and/ or the Windmill Islands, East Antarctica. Both chlorophyll fluorescence and gas exchange showed maximum values of electron transport rate occurred at canopy temperatures higher than 20°C. The optimum temperature for both net assimilation of CO 2 and photoprotective heat dissipation of three East Antarctic species was 20-30°C and at temperatures below 10°C, mesophyll conductance did not significantly differ from 0. Maximum mitochondrial respiration rates occurred at temperatures higher than 35°C and were lower by around 80% at 5°C. Despite the extreme cold conditions that Antarctic mosses face over winter, the photosynthetic apparatus appears optimised to warm temperatures. Our estimation of the total carbon balance suggests that survival in this cold environment may rely on a capacity to maximize photosynthesis for brief periods during summer and minimize respiratory carbon losses in cold conditions.

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Section: Discussionmentioning

confidence: 99%

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

et al. 2020

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“…Dehydration rate is not easily standardized across bryophyte species (Alpert and Oliver ), because several parameters influence desiccation rate such colony size, shoot morphology and microclimatic conditions (Proctor , Stark , Rice et al ). Dehydration rate can range from fast, takings shoots less than an hour to be desiccated (Oliver et al ), to slower [a few hours; Stark et al ) or very slow (on the order of several hours; Bewley ].…”

Section: Methodsmentioning

confidence: 99%

Dehydration rate determines the degree of membrane damage and desiccation tolerance in bryophytes

Carvalho

Catalá

Branquinho

et al. 2016

Physiologia Plantarum

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Desiccation tolerant (DT) organisms are able to withstand an extended loss of body water and rapidly resume metabolism upon rehydration. This ability, however, is strongly dependent on a slow dehydration rate. Fast dehydration affects membrane integrity leading to intracellular solute leakage upon rehydration and thereby impairs metabolism recovery. We test the hypothesis that the increased cell membrane damage and membrane permeability observed under fast dehydration, compared with slow dehydration, is related to an increase in lipid peroxidation. Our results reject this hypothesis because following rehydration lipid peroxidation remains unaltered, a fact that could be due to the high increase of NO upon rehydration. However, in fast-dried samples we found a strong signal of red autofluorescence upon rehydration, which correlates with an increase in ROS production and with membrane leakage, particularly the case of phenolics. This could be used as a bioindicator of oxidative stress and membrane damage.

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“…However, it has been considered difficult to standardize rates of drying across species (Alpert and Oliver, 2002) due to differential drying times among species even when exposed to the same RH. Field studies indicate that colony desiccation rate may be rapid or gradual, depending on the colony size, species, shoot architecture, and local atmospheric conditions (Alpert, 1979; Tuba, 1984; Zotz et al, 2000; Proctor, 2004; Stark, 2005; Rice et al, 2011). By convention, the rate of drying is not given as a rate per se, but as duration until shoots are desiccated, which may or may not reflect different rates of water loss depending upon the technique of desiccation.…”

Section: Ecological Elements Of Dt In Bryophytesmentioning

confidence: 99%

The desert moss Pterygoneurum lamellatum (Pottiaceae) exhibits an inducible ecological strategy of desiccation tolerance: Effects of rate of drying on shoot damage and regeneration

Stark

Greenwood

Brinda

et al. 2013

American J of Botany

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For the first time, a desert moss is shown to exhibit an ecological strategy of desiccation tolerance that is inducible, challenging the assumption that arid-land bryophytes rely exclusively on constitutive protection. Results indicate that previous considerations defining a slow-dry event in bryophytes need reevaluation, and that the ecological strategy of inducible desiccation tolerance is probably more common than currently understood among terrestrial bryophytes.

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Modeling Bryophyte Productivity Across Gradients of Water Availability Using Canopy Form–Function Relationships

Cited by 8 publications

References 43 publications

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

It Is Hot in the Sun: Antarctic Mosses Have High Temperature Optima for Photosynthesis Despite Cold Climate

Dehydration rate determines the degree of membrane damage and desiccation tolerance in bryophytes

The desert moss Pterygoneurum lamellatum (Pottiaceae) exhibits an inducible ecological strategy of desiccation tolerance: Effects of rate of drying on shoot damage and regeneration

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