Seasonal Photosynthetic Capacity Changes in Lichens: A Provisional Mechanistic Interpretation

Kershaw, K. A.

doi:10.1017/s0024282984000311

Cited by 14 publications

(4 citation statements)

References 48 publications

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“…Measurement at the ®eld-ambient temperature and light is one means to simplify this interaction and is a physiologically relevant approach, given support by the good correlations found between gross photosynthesis and electron transport. This approach is also faster and less laborious than the matrix-response approach extolled by Kershaw (1984).…”

Section: Discussionmentioning

confidence: 99%

“…Periods of photosynthetic activity measured by chlorophyll¯u-orescence vary seasonally in Peltigera (Lange et al 1999). Seasonal changes in photosynthetic CO 2 uptake can be driven by light and temperature (Coxson andKershaw 1984;Kershaw 1984) or the combination of both (Larson and Kershaw 1975). Chlorophyll content can also change seasonally Kershaw and Webber 1984).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

MacKenzie

MacDonald

Dubois

et al. 2001

Planta

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Lobaria pulmonaria (L.) Hoffm. is an epiphytic lichen common to temperate deciduous forests where it copes with large changes in temperature and light levels through repeated annual cycles. Samples of L. pulmonaria were taken from a deciduous forest in southeastern Canada at 35-day intervals from February 1999 to February 2000 and also from a rare population in an evergreen forest in March and August 1999. At field-ambient temperatures and light levels, the realised photosystem II (PSII) electron transport was low both in the summer and winter, with transient peaks in the spring and autumn. In contrast, the seasonal pattern of potential electron transport measured at a fixed 20 degrees C peaked in winter, showing the importance of temperature in driving photosynthesis to low levels in the winter despite an acclimation of electron-transport potential to exploit the high ambient light. Realised gross CO2 uptake was correlated with PSII electron transport at mechanistically plausible rates at all sampling sites in the summer but not in the winter, indicating electron diversion away from CO2 fixation in the winter. Chlorophyll content was highest in the dark summer months. The amount of ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO) large subunit (LSU) was highest in spring. Changes in the level of this hyperabundant protein and in the activity of PSII maintained a relatively constant rate of maximum CO2 uptake per RuBisCO LSU from April through November, despite great changes in the seasonal light and temperature. L. pulmonaria acclimates between light and temperature stress in the winter months to light-limitation in the dark summer months. Transition intervals in the spring and autumn, with warm, bright and wet conditions, are likely the most amenable times for growth.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

MacKenzie

MacDonald

Dubois

et al. 2001

Planta

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“…Firstly, in addition to the light conditions per se during the day-time (Jonsson Č abrajić, Moen & Palmqvist 2010), the ratio between light and dark active periods will also be an important determinant . Secondly, respiration may be increased more than photosynthesis by increases in temperature (see Kershaw 1984;Lambers 1985;Sundberg et al 1999). Thirdly, respiration may be higher at the beginning of a wet period than in later stages (Sundberg et al 1999).…”

Section: Modelling Lichen Performance Beyond Water-related Activationmentioning

confidence: 99%

Modelling hydration and photosystem II activation in relation to in situ rain and humidity patterns: a tool to compare performance of rare and generalist epiphytic lichens

Čabrajić

Lidén

Lundmark

et al. 2010

Plant Cell & Environment

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A dynamic water and activity model was developed to assess how efficiently lichens can exploit in situ rain and humid air. The capacity to rehydrate and activate photosynthesis [i.e. photosystem II (PSII)] by these water sources was compared among four hydrophilic and one generalist epiphytic lichen. Hydration status, potential (instant activation) and realized (delayed activation) day-light activity were simulated using a model based on species-specific hydration, PSII activation characteristics and in situ water content for Platismatia norvegica in three microclimatic scenarios. The results showed that delayed PSII activation could have profound effects on lichens' ability to exploit environmental water sources. During rain, realized activity was reduced by 19, 34 and 56% compared to simulations assuming instant activation for three hydrophilic lichens in the driest microclimate. During humid air, the reduction was 81% for the most extreme species and scenario, because of slow hydration and low equilibrium water content. Many and brief hydration events may thus hamper species with slow activation and fast desiccation kinetics. No evidence of compensation by a 'water-holding' morphology was observed among studied species. The developed model may provide a tool for identifying suitable habitats for long-term persistence of lichens with physiological constraints.

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“…Its growth (unlike a number of other species with which Stone worked) could not be predicted using climatic data. She attributed this growth pattern, in R. farinacea and a number of other macrolichens, to effects of photosynthetic acclimation to the previous season (Kershaw 1984(Kershaw , 1985. Acclimation involves seasonal change in photosynthetic capacity as a result of seasonal addition of photosynthetic units, seasonal uncoupling of electron flow and ATP synthesis, and fluctuations in levels of rate-limiting enzymes.…”

Section: Our Observations Of Environmentally Induced Growth Rates Arementioning

confidence: 99%

Growth Patterns in Ramalina menziesii in California: Coastal vs. Inland Populations

Boucher¹,

Nash²

1990

The Bryologist

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. American Bryological and Lichenological Society is collaborating with JSTOR to digitize, preserve and extend access to The Bryologist.Abstract. The fruticose lichen Ramalina menziesii varies morphologically across its range in central, coastal California: The thallus is thin and filamentous near the ocean, net-like and coarser inland. We used a nondestructive sampling technique to estimate seasonal and annual linear growth of the inland form transplanted within an inland site and to a coastal site. Growth at the inland site was concentrated in thefall and winter months when precipitation occurred; growth at the coastal site was nearly constant through the first year of the study. Ramalina menziesiifrom the inland site grew significantly faster at the coast (38.7%/yr.) than inland (20.1%/yr.). Lichen from both sites was transplanted both within and between sites and biomass increase was measured destructively after 1 yr. Both morphs grew equally within the same site, and more rapidly at the coastal site. Annual growth rates were lower when estimated as biomass: Approximately 14%/yr. inland and 24%/yr. at the coast. Some genetic differences appeared to exist between morphological types, but their growth responses to the environment were plastic. Ramalina menziesii Tayl. is a fruticose lichen, characterized by a reticulate thallus, that dominates the epiphytic community of central coastal California, often forming a dense, pendulous canopy. Its thallus morphology ranges from relatively coarse nets in sunny, inland areas to thin filaments in foggy, coastal regions (Larson 1983; Larson et al. 1985;Rundel 1974). We examined absolute and relative growth rates of long-term within-site and reciprocal transplants from a coastal and an inland site by two methods--length and biomass increase. The results are compared with photosynthetic estimates of annual turnover (Matthes-Sears & Nash 1986) and are used to suggest potential adaptive significance of the two distinct morphological types studied.Growth in lichens can be expressed as an increase in linear dimension or biomass. In either case, growth is generally a function of the original size of the thallus (Hale 1974; Hawksworth & Hill 1984) and is best expressed in relative terms, as percent per unit time (Farrar 1974; Woolhouse 1968).Direct measurement of growth in many lichens requires long-term study because growth rates are very slow (Armstrong 1975;Hale 1973Hale , 1974. However some lichens have rapid, readily detectable growth (Rhoades 1977; Stone 1986). In a model of R. menziesii monthly gross carbon fixation, Matthes-Sears and Nash (1986) estimated that gross carbon gain at an inland site was 215% per year.

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Seasonal Photosynthetic Capacity Changes in Lichens: A Provisional Mechanistic Interpretation

Cited by 14 publications

References 48 publications

Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

Seasonal changes in temperature and light drive acclimation of photosynthetic physiology and macromolecular content in Lobaria pulmonaria

Modelling hydration and photosystem II activation in relation to in situ rain and humidity patterns: a tool to compare performance of rare and generalist epiphytic lichens

Growth Patterns in Ramalina menziesii in California: Coastal vs. Inland Populations

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