Data/hora: 24/05/2024 02:35:38

Biblioteca(s): 	Embrapa Semiárido.	
Data corrente: 	14/06/2019	
Data da última atualização: 	02/12/2019	
Autoria: 	DANTAS, B. F.; MATIAS, J. R.; LOPES. A. P.; ARAGÃO, C. A.	
Afiliação: 	BARBARA FRANCA DANTAS, CPATSA; JANETE RODRIGUES MATIAS; ARMANDO PEREIRA LOPES; CARLOS ALBERTO ARAGÃO.	
Título: 	Physiological changes in seeds and seedlings of pumpkins submitted to salt stress.	
Ano de publicação: 	2019	
Fonte/Imprenta: 	Bioscience Journal, Uberlândia, v. 35, n. 3, p. 763-774, 2019.	
DOI: 	10.14393/BJ-v35n3a2019-41887	
Idioma: 	Inglês	
Conteúdo: 	Salinity is one of the most limiting environmental factors for plant growth in semi-arid regions.Excessofsalts reduces water potential, causes physiological drought and can influence germination and initial growth of plants. The objective of this work was to study physiological and metabolic changes in seeds and seedlings of pumpkin (Cucurbita pepo cultivars Caserta and Redonda and C. maxima cv. Coroa)in a saline condition of salt stress. Thus, we it was quantified germination parameters; seedlings growth; seeds and seedlings respiration; degradation of total soluble sugars, reducing sugars and total proteins in cotyledons and the activity ascorbate peroxidase (APX), glutathione-S-transferase (GST) and catalase (CAT) during germination and initial growth of the pumpkin species studied in saline conditions. The experimental design was totally randomized in a factorial scheme 6x3, with six electrical conductivities (0; 2; 4; 6; 8 e 10 dS.m-1) and three cultivars (Redonda, Caserta and Coroa). Salinity did not influence the rate of seed respiration during the germination, although seedlings respiration decreased, as well as its vigour. Total sugars were degraded, while there was accumulation of reducing sugars and proteins in cotyledons of germinating seeds in salt solutions. Increased electrical conductivity reduced APX activity in the embryo and CAT in cotyledons, but did not influence GST. Pumpkin seedlings showed low tolerance to salt stress	
Palavras-Chave: 	Estresse salino.	
Thesagro: 	Abóbora; Condutividade Eletrica; Cucúrbita Máxima; Cucúrbita Pepo; Cucurbitaceae; Hortaliça Cucurbitácea; Salinidade; Semente.	
Thesaurus Nal: 	Cucurbita; Pumpkins.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/198566/1/Dantas-et-al-2019-Bioscience-J.pdf	
Registro original: 	Embrapa Semiárido (CPATSA)	
Exemplares: 	CPATSA - (58617-1) - UPC - AP - DD -  -  -  - DIS