Photosynthesis, Water Relations and Thallus Structure of Stictaceae Lichens

Green, T. G. A.; Snelgar, W. P.; Wilkins, A.L.

doi:10.1007/978-1-4613-2527-7_5

Cited by 38 publications

(36 citation statements)

References 23 publications

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“…All lichens measured over 20 months at Lake Waikareiti, Urewera National Park (Snelgar 1981). relations, lower water loss per unit area, in these constant low radiation forest environments may extend the photosynthetic period for these large thalli (Green et al 1985). The two genera also show a great diversity of thallus form.…”

Section: Rainforest Lichensmentioning

confidence: 98%

“…Environment: structure interactions CO 2 gas exchange/structure relationship The CO 2 gas exchange parameters of several Pseudocyphellaria and Sticta species have been investigated with an emphasis on obtaining information about diffusion pathways and diffusion resistances (Green et al 1985). The major features of this work can be summarized as follows.…”

Section: Rainforest Lichensmentioning

confidence: 99%

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Ecophysiological Adaptations of the Lichen Genera Pseudocyphellaria and Sticta to South Temperate Rainforests

Green

Lange²

1991

The Lichenologist

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Temperate rainforests are a poorly researched habitat with respect to lichen ecophysiology in comparison to desert and polar regions. The evergreen, broadleaf forests provide a dim, moist environment that is relatively stable throughout the year. Lichens are abundant in both quantity and species diversity with the large foliose genera Sticta and Pseudocyphellaria normally being dominant, visually and in terms of biomass. These lichens exhibit a great diversity of both form and habitat range. Physiological and morphological adaptation has also been demonstrated. Pseudocyphellaria dissimilis shows changes in thallus water storage capacity with evaporative demand and is also highly shade-adapted. The species has the lowest light saturation and compensation values for photosynthesis yet known for lichens (20 and 1 (imolm" 2 s"', PAR, respectively). Unexpectedly it is also highly desiccation-sensitive with some thalli being killed after only 20 h exposure to 15% relative humidity. Photobiont versatility is also a feature of these genera. Photosymbiodemes occur, i.e. a single thallus containing both green algal and cyanobacterial sectors. Because the different sectors have the same fungal partner and grow in the same habitat, it is possible to investigate whether particular physiological traits are photobiont determined. The ability to recover photosynthetic activity in humid air is confined to thalli with green algal photobionts whilst the inability of thalli containing cyanobacterial photobionts to tolerate high light stress may be related to their lack of a protective xanthophyll cycle.

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Section: Rainforest Lichensmentioning

confidence: 98%

Section: Rainforest Lichensmentioning

confidence: 99%

Ecophysiological Adaptations of the Lichen Genera Pseudocyphellaria and Sticta to South Temperate Rainforests

Green

Lange²

1991

The Lichenologist

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“…Considerando la intensidad lumínica, se puede reconocer que las especies con cianobacterias como fotobionte primario son frecuentes en todos los lugares, desde sombreados a expuestos, probablemente por la capacidad de absorber agua líquida que poseen las cianobacterias, además de la fijación de nitrógeno (Kelly & Becker, 1975;Becker, 1980;Green et al, 1980Green et al, , 1985Guzmán et al, 1990;Green & Lange, 1991;Beckett, 1995;Zotz et al, 1998;Antoine, 2004;Benner et al, 2007). También podría deberse a las diferentes adaptaciones cromáticas de las cianobacterias en la utilización de numerosos pigmentos, entre ellos los ficobilínicos, que les permiten absorber energía lumínica hasta a bajas intensidades de luz (Grossman, Schaefer, Chiang & Collier, 1993;Kehoe, 2010).…”

Section: Discussionunclassified

“…Por asociarse en su mayoría con fotobiontes cianobacteriales, estos líquenes contribuyen a la fijación de nitrógeno atmosférico y sirven como fertilizantes naturales (Kelly & Becker, 1975;Becker, 1980;Green, Horstmann, Bonnett, Wilkins & Silvester, 1980;Green & Lange, 1991;Antoine, 2004;Benner, Conroy, Lunch, Toyoda & Vitousek, 2007). Además, por su capacidad de retener grandes cantidades de agua, permiten balancear los efectos de la precipitación y generan un microclima húmedo sobre la vegetación terrestre aún tiempo después que la precipitación haya terminado (Green, Snelgar & Wilkins, 1985;Guzmán, Quilhot & Galloway, 1990;Green & Lange, 1991;Beckett, 1995;Zotz, Büdel, Meyer, Zellner & Lange, 1998). Por lo anterior, contribuyen para que los pára-mos sean fuentes indispensables de agua para áreas metropolitanas como lo es la ciudad de Bogotá (Luteyn, 1999;Crespo et al, 2010;De Brievre & Calle, 2011).…”

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Ecogeografía del género Sticta (Ascomycota liquenizados: Lobariaceae) en Colombia

Moncada

Aguirre

Lücking

2014

RBT

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Ecogeography of the genus Sticta (lichenized Ascomycota: Lobariaceae) in Colombia. Colombia is a megadiverse country, but with a substantial gap in the taxonomic and ecological knowledge of fungi and lichens. Thus, the objective of the present study was an ecogeographical analysis of the Sticta species in Colombia. The data included macrodistribution (with respect to mountain ranges and life zones) and microhabitat preferences (light, substrate) and were obtained from field work and herbarium collection labels (completed by comparison with modern geographic and vegetation maps), for 103 species of Sticta currently recognized in Colombia (plus seven additional biotypes with different photobionts or reproductive mode). Using non-metric multidimensional scaling (NMS), correlations between ecogeographical variables and species were established, and ecotypes were delimited. Colombian species of Sticta showed distinct distribution patterns relative to altitude, mountain ranges, life zones, as well as light exposure and substrate, forming several distinct groups. Cyanobacterial species tend to have wider distribution ranges than green algal species. We concluded that the orogeny of the Northern Andes substantially affected speciation of the genus Sticta and its ecogeographical differentiation. Rev. Biol. Trop. 62 (1): 257-272. Epub 2014 March 01.

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“…Sunrise activates net photosynthesis (CO 2 exchange above the zero line) but the peak was not reached after 1-2 h when the water content started to decrease. The net photosynthesis rate of lichens depends in large part on the water content of their thalli (Green et al, 1985;Lange & Matthes, 1981). In many lichens, when the thallus is fully saturated with water, diffusion of CO 2 to the phycobiont is hindered and maximum rates of CO 2 assimilation do not occur (Lange & Tenhunen, 1981).…”

Section: Effects Of Water Content On the Carbon Budget Of Lichensmentioning

confidence: 99%