Data/hora: 21/06/2024 10:39:41

Biblioteca(s): 	Embrapa Agrobiologia.	
Data corrente: 	20/04/1999	
Data da última atualização: 	20/04/1999	
Autoria: 	ARAUJO, A. P.; TEIXEIRA, M. G.; ALMEIDA, D. L. de.	
Título: 	Variability of traits associated with phosphorus efficiency in wild and cultivated genotypes of common bean.	
Ano de publicação: 	1998	
Fonte/Imprenta: 	Plant and Soil, Netherlands, v. 203, p. 173-182, 1998.	
Idioma: 	Inglês	
Conteúdo: 	Genetic variation in plant growth under limited phosphorus (P) supply is necessary to obtain more productive cultivars on low P-available soils. Two pot experiments were conducted to evaluate the variability of some traits associated with efficiency of P absorption and utilization in wild and cultivated genotypes of common bean (Phaseolus vulgaris L.) under biological N2 fixation. At two P levels (20 and 80 mg P kg-1 soil, P1 and P2, respectively), 20 wild and 6 cultivated genotypes were grown in Experiment 1, and 4 wild and 27 cultivated genotypes were grown in Experiment 2. Plants were harvested at flowering, but in Experiment 1 wild accessions that did not flower were harvested at the beginning of leaf senescence. In Experiment 1, part of the genotypic variability of wild accessions was attributed to a less homogeneous ontogenetic stage at harvest, whereas in Experiment 2 some variation in biomass production was due to distinct phenologies of cultivated genotypes. Wild lines did not seem more tolerant to low P conditions, but the genotypic variation observed suggests these materials as a source of genetic diversity. Part of the variation in the root area and root efficiency ratio (total P content: root area) was compensatory, resulting in narrow genotypic differences in the total P content. The total P content and root efficiency ratio presented a wider amplitude of variation at P2 than at P1, and P uptake was more influenced by P supply than root production. Since the genotype x P level interaction was not significant for shoot biomass and shoot P concentration in Experiment 2, P utilization efficiency may be a useful selection criterion for cultivars between limited and adequate P supply. Within the sample of genetic variability for traits related to P efficiency among wild and cultivated genotypes of common bean. 	
Palavras-Chave: 	Genotypes; N; Root nodulation.	
Thesagro: 	Genética; Genótipo; Nitrogênio; Nodulação.	
Thesaurus Nal: 	genetics; nitrogen.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (24426-1) - ADC - AP - -- -  -  - 22265 - DIS