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Provedor de dados:  Ciência Rural
País:  Brazil
Título:  Natural abundance of 15N of N derived from the atmosphere by different strains of Bradyrhizobium in symbiosis with soybean plants
Autores:  Araujo,Karla Emanuelle Campos
Torres Júnior,Carlos Vergara
Guimarães,Ana Paula
Silva,Mara Alexandre da
Alves,Bruno José Rodrigues
Urquiaga,Segundo
Boddey,Robert Michael
Data:  2019-01-01
Ano:  2019
Palavras-chave:  15N Isotopic fractionation
‘B’ value
Biological nitrogen fixation
Resumo:  ABSTRACT: To quantify the BNF contribution to legumes using the 15N natural abundance technique, it is important to know the abundance of 15N of the plants grown entirely dependent on BNF (value ‘B’). The aim of the study was to determine the 15N natural abundance of N2 fixed by different Bradyrhizobium strains in symbiosis with one soybean cultivar. Treatments consisted of soybean plants cultivated with and without inoculation with ten Bradyrhizobium strains, in five replicates planted in Leonard jars in a sand/vermiculite mixture. Plants were harvested after 46 days. The ‘B’ values of the aerial tissue (‘Bs’) ranged from -2.6 to -3.9 ‰. There was a tendency for the ‘Bs’ values of plants inoculated with strains of B. elkanii to be more negative than plants inoculated with other strains. All ‘B’ values of the whole plant were less than 1 unit of δ15N (‰) different from zero, suggesting that the symbioses have little tendency to show significant isotopic fractionation during N2 fixation, but there is considerable depletion in 15N of the N translocated to the shoot tissue.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Identificador:  http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200251
Editor:  Universidade Federal de Santa Maria
Relação:  10.1590/0103-8478cr20180265
Formato:  text/html
Fonte:  Ciência Rural v.49 n.12 2019
Direitos:  info:eu-repo/semantics/openAccess
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