Data/hora: 30/05/2024 13:48:30

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	05/01/2015	
Data da última atualização: 	07/04/2022	
Autoria: 	CEREZINI, P.; PÍPOLO, A. E.; HUNGRIA, M.; NOGUEIRA, M. A.	
Afiliação: 	PAULA CEREZINI, UEL; ANTONIO EDUARDO PÍPOLO, CNPSO; MARIANGELA HUNGRIA DA CUNHA, CNPSO; MARCO ANTONIO NOGUEIRA, CNPSO.	
Título: 	Gas exchanges and biological nitrogen fixation in soybean under water restriction.	
Ano de publicação: 	2014	
Fonte/Imprenta: 	American Journal of Plant Sciences, v. 5, n. 26, p. 4011-4017, Dec. 2014.	
ISSN: 	2158-2742	
DOI: 	http://dx.doi.org/10.4236/ajps.2014.526419	
Idioma: 	Inglês	
Conteúdo: 	Biological nitrogen fixation (BNF) in soybean is vulnerable to drought; however, there are genotypic variations among soybean cultivars regarding the ability to keep BNF under moderate water restriction. The aim of this study was to evaluate parameters related to gas exchanges and regulation of BNF in soybean genotypes BNF drought-tolerant (R01-581F and R01-416F), or drought-susceptible (CD 215 and BRS 317), submitted to adequate water supply or restriction between 45 and 55 days after emergence. We searched for traits associated with tolerance/susceptibility to drought, which might be useful in the selection of drought-tolerant soybean genotypes. Plant biomass was not affected under water restriction, but the number and dry weight of nodules reduced by 33% and 12%, respectively, in the average of genotypes. Drought-tolerant genotypes were more effective in maintaining gas exchanges under water restriction. Under water restriction, all genotypes increased the concentration of ureides in nodules, but only the susceptible genotypes showed that in leaves. The maintenance of gas exchanges and N metabolism regulation under water restriction in genotype R01-581F suggests that these parameters may be used to characterize soybean genotypes that can be sources of drought tolerance in genetic breeding programs.	
Palavras-Chave: 	Fixação biológica de nitrogênio.	
Thesaurus Nal: 	Nitrogen fixation.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/114752/1/Gas-exchanges-and-biological-nitrogen-fixation-in-soybean-under-water-restriction.pdf	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (35662-1) - UPC - AP - DD -  -  -  - DIS