Evaluation of nitrogen fixation by different strains of theAzolla-Anabaena symbiosis in the presence of a high level of ammonium

Autor:	Dl. Eskew, N. Okoronkwo, Charles Van Hove
Rok vydání:	1989
Předmět:	Cyanobacteria biology Anabaena Soil Science engineering.material biology.organism_classification Azolla Microbiology Horticulture Green manure chemistry.chemical_compound chemistry Symbiosis Botany Nitrogen fixation engineering Ammonium Fertilizer Agronomy and Crop Science
Zdroj:	Biology and Fertility of Soils. 7:275-278
ISSN:	1432-0789 0178-2762
DOI:	10.1007/bf00709661
Popis:	The proportion of N derived from N2 fixation for 99 strains ofAzolla spp. (comprising all known species) in the presence of ammonium (40 mg/1) was assessed using a15N-dilution technique. The percentage of N derived from air varied from 29.5% to 79.9%. Although the N concentration ofAzolla spp. was not correlated with fertilizer N, it correlated fairly well with N2 fixation. Regression analysis suggests that the N yield ofAzolla spp. is more dependent on N2 fixation than on ammonium assimilation. The high correlation between N yield and isotopically determined, fixed N2 indicates that the N yield could be used as a parameter in the selection ofAzolla spp. strains that are capable of maintaining high N2 fixation in the presence of a high level of ammonium.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::502bbfc11e5dbb409ac0cb49b23282da https://doi.org/10.1007/bf00709661 Zobrazit plný text záznamu Full text from SpringerLink