Effect of glyphosate on nodule formation and its interrelation with nickel content in glyphosate-resistant soybeans.

Recent research has demonstrated that glyphosate can decrease biological nitrogen fixation in glyphosate-resistant (GR) soybeans, however this reduction has been attributed directly to the effect of glyphosate on the microorganisms or indirectly through its intermediates that are also toxic to these microorganisms. This work aims to demonstrate that glyphosate can influence the symbiotic N2 fixation by lowering nickel content available to the microorganisms. The experiment was conducted in the greenhouse at the State University of Maringá, PR, Brazil during the summer cropping season, 2008. The experimental design was a completely randomized blocks in a factorial scheme 4 x 3 x 2 where the first factor was: (T1 - single application of glyphosate (900 g a.e. ha-1) at the four-leaf stage; T2 - sequential application (450 + 450 g a.e. ha-1) at the four-leaf and five-leaf stage; T3 - without glyphosate; T4 - non-GR parental line]; the second factor, maturity group (early, medium and late;) and third factor soil type. Under glyphosate use, GR soybeans showed reduced photosynthetic parameters, nickel contents, and nodule, shoot and root dry biomass.

Bibliographic Details

Main Authors:	ZOBIOLE, L. H. S., OLIVEIRA JUNIOR, R. S. de, KREMER, R. J., CASTRO, C. de, OLIVEIRA, F. A. de, YAMADA, T., CONSTANTIN, J., OLIVEIRA JUNIOR, A. de
Other Authors:	LUIZ HENRIQUE SAES ZOBIOLE, UEM; RUBEM SILVÉRIO DE OLIVEIRA JUNIOR, UEM; ROBERT JOHN KREMER, USDA/ARS; CESAR DE CASTRO, CNPSo; FABIO ALVARES DE OLIVEIRA, CNPSo; TSUIOSHI YAMADA, AGRINATURA; JAMIL CONSTANTIN, UEM; ADILSON DE OLIVEIRA JUNIOR, CNPSo.
Format:	Parte de livro biblioteca
Language:	English eng
Published:	2009-12-11
Subjects:	Glifosato., Fixação de Nitrogênio, Soja.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/577763
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