Data/hora: 09/06/2024 17:43:19

Provedor de dados: 	124	
País: 	Brazil	
Título: 	Early indirect selection for nitrogen use efficiency in maize1	
Autores: 	Caixeta,Débora Santos; Fritsche-Neto,Roberto; Granato,Ítalo Stefanine Correia; Oliveira,Lucimar Rodrigues de; Galvão,João Carlos Cardoso.	
Data: 	2015-06-01	
Ano: 	2015	
Palavras-chave: 	Zea mays; Path analysis; Abiotic stress; Plant breeding.	
Resumo: 	Several studies to evaluate nitrogen use efficiency (NUE) have been carried out using early growth stages. However, there are no scientific reports on the ideal stage for evaluation and on which characteristics have the highest correlation with the NUE at that stage. The aim therefore was to identify the phenological stages and secondary characteristics which maximize accuracy in early indirect selection for NUE in maize. To do this, three endogamic maize strains were evaluated in a completely randomised design with five replications, in a triple factorial scheme (strains x N levels x phenological stage), at two contrasting nitrogen levels: low and high nitrogen. The plants were evaluated at five growth stages: stage nine (V9), with 14 fully-developed leaves (V14), tasseling (VT), flowering (R1) and physiological maturity (R6). The following characteristics were evaluated: efficiency in the usage, absorption, use and translocation of nitrogen; activity of nitrate reductase and glutamine synthetase; length of the lateral and axial roots; specific root area; chlorophyll content; number of leaves; plant height; stem diameter; and the levels of phosphorus and potassium. Considering the estimated direct and indirect gains, it can be concluded that the activities of glutamine synthetase at the V9 and V14 stages permit early indirect selection for nitrogen use efficiency in maize under conditions of low and high N availability respectively.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000200369	
Editor: 	Universidade Federal do Ceará	
Relação: 	10.5935/1806-6690.20150016	
Formato: 	text/html	
Fonte: 	Revista Ciência Agronômica  v.46 n.2 2015	
Fonte: 	info:eu-repo/semantics/openAccess