Data/hora: 07/06/2024 02:31:18

Provedor de dados: 	91	
País: 	Brazil	
Título: 	Chlorophyll a fluorescence in saccharine sorghum irrigated with saline water	
Autores: 	Monteiro,Danilo R.; Melo,Hidelblandi F. de; Lins,Cintia M. T.; Dourado,Pablo R. M.; Santos,Hugo R. B.; Souza,Edivan R. de.	
Data: 	2018-10-01	
Ano: 	2018	
Palavras-chave: 	Salinity; Photosynthetic pigments; Photochemical efficiency.	
Resumo: 	ABSTRACT Soil salinity directly affects plants, interfering in the emission of fluorescence, and promoting the degradation of photosynthetic pigments. Thus, estimating the damage to the photosynthetic apparatus caused by saline water is an important tool to detect abiotic stresses. For this purpose, sorghum plants were cultivated in a greenhouse and irrigated with two water sources (NaCl and salt mixture) with six levels of electrical conductivity (EC) (0, 2.5, 5, 7.5, 10, and 12.5 dS m-1), forming a 6 × 2 factorial in randomized blocks with four repetitions. At 60 days after sowing, the photosynthetic pigments were quantified, the chlorophyll a fluorescence parameters (initial fluorescence [F0]; variable fluorescence [Fv]; maximum fluorescence [Fm]; quantum efficiency of photosystem II - PSII [Fv/Fm]; electron flux per reaction center [ET0/CR]; quantum energy dissipation [DI0/CR] and quantum yield for heat dissipation [φD0]) were evaluated. The photosynthetic pigments were decreased with an increase in the salinity of the irrigation water, and were more expressive at higher electrical conductivities. With the wear on the photosynthetic apparatus by the increase in salinity, a reduction in the emission of the chlorophyll a fluorescence was observed, pointing to a possible photoinhibition of photosystem II.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001000673	
Editor: 	Departamento de Engenharia Agrícola  - UFCG	
Relação: 	10.1590/1807-1929/agriambi.v22n10p673-678	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Engenharia Agrícola e Ambiental  v.22 n.10 2018	
Fonte: 	info:eu-repo/semantics/openAccess