Data/hora: 14/06/2024 15:01:10

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	27/04/1993	
Data da última atualização: 	26/10/2004	
Autoria: 	CREGAN, P. B.; KEYSER, H. H.; SADOWSKY, M. J.	
Título: 	The use of host X strain incompatibilities in soybean to restrict nodulation of indigenous strains of Bradyrhizobium japonicum.	
Ano de publicação: 	1989	
Fonte/Imprenta: 	In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.	
Volume: 	t.3	
Páginas: 	p.1131-1137.	
Idioma: 	Inglês	
Conteúdo: 	Host controlled incompatibility between a legume and its Rhizobium Bradyrhizobium microsymbiont consists of two basic types. The first is a nodulation defect in which nodule formation is abnormal or completely absent, and the second, occurs when nodulation is "norma;" but N2 fixation effectiveness is significantly reduced. Both types of incompatibilities can be exploited in soybean to reduce or eliminate nodulation by indigenous B. japonicum in favor of highly effectiv inoculant strains. Strains of serocluster 123 are important indigenous strains in U.S. soils, are highly competitive in nodule formation, and are characerized by mediocre N2 fixation effectveness. We have identified host-controlled strain-specific nodulation defects in theree different soybean genotypes that restrict nodulation by subgroups of serocluster 123. Between the theree, the nodulation of 17 of 20 serocluster 123 isolates is restricted. These defects may be combined in one genotype ot eliminate nodulation by a large portion of indigenous serocluster 123. An example of the second type of incompatibility occurs in glycine soja PI 468397 that nodulates, but fixes no N2. withs strain USDA 123. When grown in soybean-rhizobia free soil and inoculated with USDA 123 and the R. fedii strain USDA 193, 8% of the nodule formed by 468397 may  be used as the source of a gene or genes or to condition exclusion of indigenous serocluster 123 strains and thereby allow nodulation by an inoculant carrying a strains(s) of R. fredii.	
Palavras-Chave: 	EUA; Fixacao; Fixation; Soybean; USA.	
Thesagro: 	Bradyrhizobium Japonicum; Nitrogênio; Nodulação; Rhizobium; Soja.	
Thesaurus Nal: 	nitrogen; nodulation.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)