Physiologische und ökologische Untersuchungen an Laubund Strauchflechten

Stocker, Otto

doi:10.1016/s0367-1615(17)31122-9

Cited by 32 publications

(14 citation statements)

References 14 publications

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“…Sea sonal rains in hot dry regions can produce a remarkable rise in photosynthetic rates [Guttenberg & Buhr (69), Harder et at. (73), Stocker (209,213)], although-as in tidally exposed seaweeds [Stocker & Holdheide (214)J the dry phase need not represent a "resting season" for photosynthesis (73).…”

Section: Variation Of Photosy?ilthetic Rates At Light-saturationmentioning

confidence: 99%

Photosynthesis Under Natural Conditions

Talling¹

1961

Annu. Rev. Plant. Physiol.

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Section: Variation Of Photosy?ilthetic Rates At Light-saturationmentioning

confidence: 99%

Photosynthesis Under Natural Conditions

Talling¹

1961

Annu. Rev. Plant. Physiol.

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“…Goebel (1926), Stocker (1927Stocker ( , 1956) and Renner (1932) reported on structural processes during dehydration and water uptake. They mentioned that during desiccation thick-walled cells suddenly become gas-filled, findings which were later confirmed by Ried (1960) for crustose species.…”

Section: Introductionmentioning

confidence: 99%

Structural and functional processes during water vapour uptake and desiccation in selected lichens with green algal photobionts

Scheidegger

Schroeter

Frey

1995

Planta

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Abstract. Structural alterations of the photobiont and mycobiont cells of lichens have been related to CO2-gas exchange during experiments involving water vapour uptake and desiccation of liquid-water-saturated thalli. Increasing water vapour uptake of air dry lichens led to a gradual unfolding of the photobiont cells in Lobaria pulmonaria, Pseudevernia furfuracea, Ramalina maciformis and Teloschistes lacunosus as studied by low-temperature scanning electron microscopy. The data indicated that globular, probably turgid, cells and also slightly infolded or even heavily collapsed cells contributed to positive net photosynthesis, which was reached after water vapour uptake by the four species studied. During desiccation of fully water-saturated thalli of L. pulmonaria, extrathalline water films gradually evaporated before maximum values of CO2-gas exchange were measured and before photobiont cells started to shrivel. In contrast, in P. furfuracea the CO2-gas exchange maximum was reached when a considerable percentage of photobiont cells had already collapsed and while other parts of the thalli were still covered with liquid water. Further desiccation led to cavitation of the cortical cells in both species, this occurring at water contents at which net photosynthesis was still positive.

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“…In contrast to most higher plants, lichens use water vapour as an important source of moisture under arid conditions. Stocker (1927) reported that lichens in equilibrium with an atmosphere of high relative humidity weigh more and have greater COg uptake than lichens in low relative humidity. found that woodland lichens maintain positive COg exchange at 80-85 % RH and 10 °C (water potential = -29-2 to -21-3 MPa), and Lange and colleagues (Lange & Bertsch, 1965;Lange, 1969;Lange, Schulze & Koch, 1970) have shown that the Negev Desert lichens Ramalina maciformis (Del.)…”

Section: Introductionmentioning

confidence: 99%

Water relations, thallus structure and photosynthesis in Negev Desert lichens

Palmer

Friedmann

1990

New Phytologist

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SUMMARYThe role of lichen thallus structure in water relations and photosynthesis was studied in Ramalina maciformis (Del.) Bory and Teloschistes lacunosus (Rupr.) Sav. Water-vapour adsorption and photosynthesis are dependent upon thallus integrity and are significantly lower in crushed thalli. Cultured phycobiont (Trebouxia sp.) cells are capable of photosynthesis over the same relative humidity range (> 80 % RH) as are intact lichens. Thus, watervapour adsorption by the thallus and physiological adaptation of the phycobiont contribute to the ability of these lichens to photosynthesize in an arid environment. Despite differences in their anatomical structure and wateruptake characteristics, their COj incorporation is similar. The two lichens use liquid water differently and they occupy different niches.

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Physiologische und ökologische Untersuchungen an Laubund Strauchflechten

Cited by 32 publications

References 14 publications

Photosynthesis Under Natural Conditions

Photosynthesis Under Natural Conditions

Structural and functional processes during water vapour uptake and desiccation in selected lichens with green algal photobionts

Water relations, thallus structure and photosynthesis in Negev Desert lichens

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