Data/hora: 11/06/2024 18:29:56

Provedor de dados: 	64	
País: 	Brazil	
Título: 	Hydrogen sulfide, potassium phosphite and zinc sulfate as alleviators of drought stress in sunflower plants	
Autores: 	Almeida,Gabriel Martins; Silva,Adinan Alves da; Batista,Priscila Ferreira; Moura,Luciana Minervina de Freitas; Vital,Roberto Gomes; Costa,Alan Carlos.	
Data: 	2020-01-01	
Ano: 	2020	
Palavras-chave: 	Photosynthesis; Water deficit; Malonaldehyde; Leaf water potential; Mitigating substance.	
Resumo: 	ABSTRACT Drought is the most harmful environmental factor crop productivity. Some chemicals are used in agriculture to mitigate the damage from this stress on plants. Therefore, we examined whether the spraying of zinc sulfate (ZS), potassium phosphite (KPhi) and the hydrogen sulfide (H2S) donor sodium hydrosulfide (NaHS) would mitigate the deleterious effects of water deficit on sunflower plants by analyzing physiological and biometric characteristics. The experiment was carried out in a greenhouse using a randomized block design with five replications. The treatments were arranged in a 4 x 2 factorial scheme: [Factor A (Alleviators)] - spraying of KPhi (0.5 L ha-1), ZS (3.2 kg ha-1), NaHS (1.2 g ha-1), and water; [Factor B (substrate humidity, SH)] - 100% (well irrigated) and 30% (water deficit, WD) of field capacity. Under WD conditions, alleviators led to the maintenance of higher values of water potential (ΨW), a lower content of leaf malonaldehyde (MDA), and increased activity of the antioxidant enzyme peroxidase (POX), except for ZS. However, leaf osmotic potential, proline concentration, variables related to gas exchange and chlorophyll a fluorescence, and biometric characteristics differed only according to the SH factor. The results of ΨW and MDA for sunflower plants under WD are indicative of the mitigating capacity of ZS, KPhi, and H2S. Thus, the spraying of these compounds on sunflower plants mitigates the effects of WD, acting specifically in physiological processes related to antioxidant responses and in the maintenance of water in leaf tissues.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100225	
Editor: 	Editora da Universidade Federal de Lavras	
Relação: 	10.1590/1413-7054202044006320	
Formato: 	text/html	
Fonte: 	Ciência e Agrotecnologia  v.44 2020	
Fonte: 	info:eu-repo/semantics/openAccess