Data/hora: 23/09/2024 16:04:06

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	06/04/2004	
Data da última atualização: 	19/09/2007	
Autoria: 	CARNEIRO, G. E. de S.; SILVA, J. F. V.; BERTAGNOLLI, P. F.; BONATO, E. R.; DIAS, W. P.; OLIVEIRA, C. A. F.; MASCARELI, F. A.	
Título: 	Evaluation of soybean breeding lines in an area infested with the soybean cyst nematode (Heterodera glycines).	
Ano de publicação: 	2004	
Fonte/Imprenta: 	In: WORLD SOYBEAN RESEARCH CONFERENCE, 7.; INTERNATIONAL SOYBEAN PROCESSING AND UTILIZATION CONFERENCE, 4.; CONGRESSO BRASILEIRO DE SOJA, 3., 2004, Foz do Iguassu. Abstracts of contributed papers and posters. Londrina: Embrapa Soybean, 2004.	
Páginas: 	p. 170-171.	
Série: 	(Embrapa Soja. Documentos, 228).	
Idioma: 	Inglês	
Notas: 	Editado por Flávio Moscardi, Clara Beatriz Hoffmann-Campo, Odilon Ferreira Saraiva, Paulo Roberto Galerani, Francisco Carlos Krzyzanowski, Mercedes Concordia Carrão-Panizzi.	
Conteúdo: 	The soybean cyst nematode (SCN), Heterodera glycines, is one of the main limiting factors to obtain higher yields in soybeans in Brazil. To control SCN, as well as other diseases, genetic resistance from soybean germplasm has been used. The objective of this research work was to evaluate the reaction to SCN of promising soybean breeding lines developed by Embrapa Wheat, at Passo Fundo/RS. In the season 2002/2003, an experiment was carried out in Assis - SP, in naturally infested area with race 3 of SCN. Were tested 168 breeding lines from resistant parentals to SCN, using the complete randomized blocks design, with three replications. Two cultivars, with fifteen replications, were used as checks: BRSMT Pintado (resistant) and Lee 68 (susceptible). The plots were 1 m long, with 0.50 m between rows. In the R8 stadium (physiologic maturation), an evaluation of the root system was made to check the presence of females of SCN, using a descriptive scale ranging from 0 (absence of females) to 5 (high incidence of females) and the root coloration, ranging from 0 (very clear coloration, without evidence of nematode attack) to 5 (dark coloration, with evidence of nematode attack). Five plants for row were pulled up, with a shovel aid, to evaluate the presence of females of SNC in the roots, based on the scale already mentioned. Plant height and agronomic value were also measured through notes varying from 1 (very adapted) to 9 (without adaptation). The values for presence of SCN females varied from 0.0 to 5.0, with average of 2.4, showing the variability among the tested genotypes. The values for presence of SCN females in Lee 68 and BRSMT Pintado cultivars were 2.3 and 0.1, respectively. Over the total of 168 breeding lines evaluated, 47 (27%) received infestation grades up to 1.7, not differing from BRSMT Pintado (Scott and Knott at probability 5%), showing low multiplication of SCN in these lines, which can also be observed by the low root darkening. In general, the height of plants and the agronomic value presented lower values, due to mainly climatic and soil conditions. Among the breeding lines with lower nematode multiplication and better agronomic behavior, PF 98 1429-36565 was recommended for commercial cultivation, by Embrapa Wheat, in the a States of Rio Grande do Sul, Paraná and São Paulo, with the name of "BRS Invernada".	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (23722-1) - UMT - PL - -- - RF 633.34072 - W927a -  - DIS