Data/hora: 21/06/2024 15:44:39

Biblioteca(s): 	Embrapa Arroz e Feijão.	
Data corrente: 	18/05/2000	
Data da última atualização: 	07/10/2021	
Autoria: 	GUIMARÃES, E. P.; AMÉZQUITA, M. C.; LEMA, G.; CORREA-VICTORIA, F.	
Afiliação: 	ELCIO PERPETUO GUIMARAES, CNPAF.	
Título: 	Determination of minimum number of growing seasons for assessment of disease resistance stability in rice.	
Ano de publicação: 	1998	
Fonte/Imprenta: 	Crop Science, v. 38, n. 1, p. 67-71, Jan./Fev. 1998.	
ISSN: 	0011-183X	
DOI: 	10.2135/cropsci1998.0011183x003800010012x	
Idioma: 	Inglês	
Conteúdo: 	The literature reports that evaluations over a number of growing seasons are required to identify stable disease resistance in rice (Oryza sativa L.). CIAT's Rice Breeding Program alms to develop lines with stable resistance; therefore, the knowledge of how long a germplasm should be assessed before being used in crosses is important. For this research, 69 commercial cultivars grown in Latin America and the Caribbean were evaluated during 11 growing seasons in a ?hot spot? site for the four most important diseases of rice: leaf and panicle blast (caused by Pyricularia grisea Sacc.), leaf scald [caused by Microdochium oryzae (Hashioka & Yokogi) Samuels & I.C. Hallett syn. Gerlachla oryzae (Hashioka & Yokogi) W. Gams syn. Rhynchosporium oryzae (Hashioka & Yokogi)], and grain discoloration (caused by species of Sarodadium, Bipolaris, Alternaria, Gerlachia, Fusarium, Phoma, Curvularia, Trichoconiella, and Pseudomonas). Cultivar mean disease severity (M), its response to increase in disease pressure (b), and the standard deviations from the regression (Sb) were calculated. Eleven evaluation seasons were considered as the most reliable period, in which an ideal set of 13 cultivars was identified based on their disease resistance stability (M, b, and Sb values). To identify the minimum number of seasons required to assess stability of resistance, simulations were made with these 13 cultivars and the 11 seasons and the coincidence in selection and the number of misclassified entries were calculated. The M and b correlation values and the number of misclassified entries suggested that seven consecutive growing seasons (two per 12-mo. period) are necessary t	
Thesagro: 	Arroz; Doença; Oryza Sativa; Resistência.	
Thesaurus Nal: 	Disease resistance; Rice.	
Categoria do assunto: 	G Melhoramento Genético	
Registro original: 	Embrapa Arroz e Feijão (CNPAF)	
Exemplares: 	CNPAF - (16646-1) - UPC - AP - DD - 1998 -  - 1998 - DIS