Data/hora: 05/06/2024 02:01:05

Provedor de dados: 	95	
País: 	Brazil	
Título: 	Action of gibberellic acid (GA3) on dormancy and activity of alpha-amylase in rice seeds	
Autores: 	Vieira,Antônio Rodrigues; Vieira,Maria das Graças Guimarães Carvalho; Fraga,Antônio C.; Oliveira,João Almir; Santos,Custódio D. dos.	
Data: 	2002-01-01	
Ano: 	2002	
Palavras-chave: 	Rice seeds; Dormancy; Germination; Gibberellic acid (GA3); Alpha-amylase.	
Resumo: 	To evaluate the effectiveness of gibberellic acid (GA3) in breaking rice seed dormancy and the use of alpha-amylase enzyme activity as an indicator of the dormancy level, seed from the intensively dormant irrigated cultivar Urucuia were used. The seeds were submitted to a pre-drying process in a forced air circulation chamber under 40ºC during 7 days and submersed in 30 mL of GA3 solution under 0, 10, 30 and 60 mg/L H2O concentrations, during 2, 24 and 36 hours. After the treatments, the alpha-amylase activity was determined by using the polyacrilamide electrophoresis and spectrophotometry. At the same time, the germination test was made. The results indicated a gain in germination and in alpha-amylase activity in higher concentrations and soaking time of seeds in GA3. These observations support the conclusion that soaking seed in 60 mg GA3/L during 36 hours can be used as a quick and efficient treatment in breaking rice seed dormancy and is equivalent to the forced air circulation chamber at 40ºC during 7 days. The alpha-amylase enzyme activity proved to be as an efficient marker of the seeds dormancy level.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222002000200008	
Editor: 	Associação Brasileira de Tecnologia de Sementes	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Sementes  v.24 n.2 2002	
Fonte: 	info:eu-repo/semantics/openAccess