منابع مشابه
The Azolla, Anabaena azollae Relationship: II. Localization of Nitrogenase Activity as Assayed by Acetylene Reduction.
Anaerobic (microaerophilic) acetylene reduction by Azolla caroliniana Willd. was dependent on light and saturated at approximately 450 foot candles. Maximum rates of acetylene reduction were 60 nmoles/mg chlorophyll minute. However, rates of 25 to 30 nmoles/mg chlorophyll minute were more common.The growth of Azolla for 35 days with nitrate or urea as a nitrogen source decreased the rate of ace...
متن کاملThe Azolla-Anabaena azollae Relationship : XI. PHYCOBILIPROTEINS IN THE ACTION SPECTRUM FOR NITROGENASE-CATALYZED ACETYLENE REDUCTION.
Visible absorption spectra are presented for the Azolla caroliniana Willd.-Anabaena azollae Strass. association and the individual partners. Although absorption by the phycobiliproteins of the endophytic cyanobacterium clearly complements the absorption by the fern pigments, their contribution to the absorption spectrum of the association is effectively concealed by the preponderance of the Azo...
متن کاملAltered nitrogenous pools induced by the azolla-anabaena azolla symbiosis.
The free amino acid and ammonia pools of Azolla caroliniana were analyzed by quantitative column chromatography on columns capable of separating all of the nitrogenous constituents normally found in physiological fluids. Comparisons were made of plants containing symbiotic algae and grown on nitrogen-free media, plants grown on media containing nitrate, and algae-free plants also grown on nitra...
متن کاملThe Azolla-Anabaena azollae Relationship : XII. Nitrogenase Activity and Phycobiliproteins of the Endophyte as a Function of Leaf Age and Cell Type.
Nitrogenase activity was measured in leaves along the main stem axes of Azolla pinnata R. Br. The activity was negligible in leaves of the apical region, rapidly increased to a maximum as leaves matured, and declined in aging leaves. In situ absorption and fluorescence emission spectra were obtained for individual vegetative cells and heterocysts in filaments of the A. pinnata and Azolla caroli...
متن کاملStudies on Molecular Identification of Anabaena Cyanobionts of Azolla Species
Azolla is a genus of free-floating water fern which is widely distributed in aquatic habitats of the tropics and temperate regions. It is one of few vascular plants known to exhibit a symbiotic association with N2fixing blue green algae, Anabaena sp. In view of this, a study was carried out on molecular identification of Anabaena strains isolated from three Azolla species. The selected Azolla s...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1977
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.59.6.1021