Título:	Physiological changes in seeds and seedlings of pumpkins submitted to salt stress.
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.
Ano de publicação:	2019
Referência:	Bioscience Journal, Uberlândia, v. 35, n. 3, p. 763-774, 2019.
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
Thesagro:	Abóbora Semente Hortaliça Cucurbitácea Cucurbitaceae Condutividade Eletrica Cucúrbita Pepo Cucúrbita Máxima Salinidade
NAL Thesaurus:	Cucurbita Pumpkins
Palavras-chave:	Estresse salino
Digital Object Identifier:	10.14393/BJ-v35n3a2019-41887
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPATSA)