1972
DOI: 10.1111/j.1469-8137.1972.tb04804.x
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NITROGEN METABOLISM IN LICHENS IV. THE NITROGENASE ACTIVITY OF THE NOSTOC PHYCOBIONT IN PELTIGERA CANINA

Abstract: Summary The content of the blue‐green alga phycobiont, Nostoc sp. in the lichen Peltigera canina has been estimated using various techniques and represents on average 2.7% of the total thallus nitrogen. Expressed in terms of cell numbers, this represents approximately 3 × 106 cells cm2, mature thallus. The nitrogenase activity, expressed as nil ethylene evolved/minute/mg Sostoc protein, varies considerably with the thallus sample, but a mean value of 10, considerably greater than that in free‐living Nostoc, ha… Show more

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Cited by 30 publications
(8 citation statements)
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“…This pretreatment served to remove any physiological variability due to previous drought conditions ( Henriksson and Simu, 1971). Millbank (1972) has shown the wide range of activity between young and old parts of the thallus of P. canina and accordingly experimental material was only removed from the outermost circumference of the lichen clone. Each time course experiment was started at the same time of day to minimize possible diurnal effects.…”
Section: Methodsmentioning
confidence: 99%
“…This pretreatment served to remove any physiological variability due to previous drought conditions ( Henriksson and Simu, 1971). Millbank (1972) has shown the wide range of activity between young and old parts of the thallus of P. canina and accordingly experimental material was only removed from the outermost circumference of the lichen clone. Each time course experiment was started at the same time of day to minimize possible diurnal effects.…”
Section: Methodsmentioning
confidence: 99%
“…1). Within these structures, conditions are microaerobic (Millbank, 1972 ;Grilli-Caiola et al, 1989 ;Bergman et al, 1992b ;Campbell & Meeks, 1992) and the host tissue is nonphotosynthetic (Table 3). In most cases the cyanobionts form 1-4% of the host biomass Rai, 1990c ;Osborne et al, 1992).…”
Section: Location Of Cyanobionts In Their Hostsmentioning
confidence: 99%
“…It has been suggested that the vegetative cells of the cyanobiont in P. canina may possess N2ase activity facilitated by microaerobic surroundings [7]. This view gains credence from the observations on non-heterocystous cyanobacteria, which express Nzase under anaerobic/microaerobic conditions [5,6].…”
Section: Resultsmentioning
confidence: 86%
“…Some cyanobacteria in symbiosis apparently live under microaerobic conditions, e.g., in lichens and in cycad coralloid roots. Under such conditions, the possibility of N2ase expression in vegetative cells has been suggested [7]. Most symbiotic cyanobacteria show a high heterocyst frequency [8].…”
Section: Introductionmentioning
confidence: 99%