Data/hora: 16/06/2024 19:59:48

Provedor de dados: 	63	
País: 	Brazil	
Título: 	Carrot seed germination and vigor in response to temperature and umbel orders	
Autores: 	Pereira,Roseane Sousa; Nascimento,Warley Marcos; Vieira,Jairo Vidal.	
Data: 	2008-04-01	
Ano: 	2008	
Palavras-chave: 	Daucus carota L.; Thermo-inhibition; Physiological quality.	
Resumo: 	Several factors may influence carrot (Daucus carota L.) crop establishment. High temperatures (35 - 40°C), for instance, may delay or inhibit carrot seed germination in the field and so compromise the stand establishment. Carrot seeds from superior umbel orders usually have better physiological quality than those of lower umbel orders. These seeds from superior umbel orders may also show a better performance in adverse conditions. In addition, seeds from different ages show differences in vigor, which affect the stand establishment, mainly under adverse conditions. The aim of this study was to verify the germination at high temperatures and the carrot seed vigor of different umbel orders of 'Brasília', as well as the different 'Alvorada' seed lots. Preliminarily, 'Brasilia' seeds were incubated at temperatures ranging from 20 to 36°C. Also, seeds from the primary, secondary and tertiary umbel orders harvested separately from a basic seed production field and seeds from lots harvested in 1998, 1999 and 2000 were analyzed to the following tests: germination at 20°C (optimum) and 35°C (adverse), accelerated aging, cold test, seedling emergence in greenhouse and mass of 100 seeds. High temperatures reduced carrot seed germination. Seeds germinated better at 20°C than 35 or 36ºC. Seeds from primary and secondary orders, as well as less aged seed lots, had higher vigor and germination at high temperature.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200006	
Editor: 	São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"	
Relação: 	10.1590/S0103-90162008000200006	
Formato: 	text/html	
Fonte: 	Scientia Agricola  v.65 n.2 2008	
Fonte: 	info:eu-repo/semantics/openAccess