Oxygen concentration within the leaf cavities from the apex to the base of Azolla filiculoides Lam. was measured by an oxygen microprobe. The oxygen values in the leaf cavities were lower than in the aerated water and were within the range 0.157–0.183 atm. At 140 μE m−2 s−1 irradiance, oxygen decreased in the leaf cavities where acetylene reduction activity and heterocyst frequency were highest. Oxygen evolution and oxygen consumption inhibition by KCN strongly suggest that oxygen concentration changes, in the leaf cavities, are due to both photosynthesis of Azolla and Anabaena and to respiration of the whole system.

Grilli Caiola, M., Canini, A., MOSCONE DINIA, D. (1989). Oxygen concentration, nitrogenase activity and heterocyst frequency in the leaf cavities of Azolla filiculoides Lam. FEMS MICROBIOLOGY LETTERS, 59, 283-287.

Oxygen concentration, nitrogenase activity and heterocyst frequency in the leaf cavities of Azolla filiculoides Lam

CANINI, ANTONELLA;MOSCONE DINIA, DANILA
1989

Abstract

Oxygen concentration within the leaf cavities from the apex to the base of Azolla filiculoides Lam. was measured by an oxygen microprobe. The oxygen values in the leaf cavities were lower than in the aerated water and were within the range 0.157–0.183 atm. At 140 μE m−2 s−1 irradiance, oxygen decreased in the leaf cavities where acetylene reduction activity and heterocyst frequency were highest. Oxygen evolution and oxygen consumption inhibition by KCN strongly suggest that oxygen concentration changes, in the leaf cavities, are due to both photosynthesis of Azolla and Anabaena and to respiration of the whole system.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore BIO/01
English
Con Impact Factor ISI
Azolla-Anabaena; Oxygen microprobe; Nitrogenase activity; Heterocysts
Grilli Caiola, M., Canini, A., MOSCONE DINIA, D. (1989). Oxygen concentration, nitrogenase activity and heterocyst frequency in the leaf cavities of Azolla filiculoides Lam. FEMS MICROBIOLOGY LETTERS, 59, 283-287.
Grilli Caiola, M; Canini, A; MOSCONE DINIA, D
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/64069
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