02333naa a2200301 a 450000100080000000500110000800800410001902400380006010000180009824501100011626000090022652014700023565000140170565000130171965000130173265000270174565000230177265000200179565000180181565000290183365000150186265000120187765300200188970000180190970000170192770000190194477300680196321098692019-12-02       2019    bl uuuu     u00u1 u    #d7 a10.14393/BJ-v35n3a2019-418872DOI1 aDANTAS, B. F.  aPhysiological changes in seeds and seedlings of pumpkins submitted to salt stress.h[electronic resource]  c2019  aSalinity 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  aCucurbita  aPumpkins  aAbóbora  aCondutividade Eletrica  aCucúrbita Máxima  aCucúrbita Pepo  aCucurbitaceae  aHortaliça Cucurbitácea  aSalinidade  aSemente  aEstresse salino1 aMATIAS, J. R.1 aLOPES. A. P.1 aARAGÃO, C. A.  tBioscience Journal, Uberlândiagv. 35, n. 3, p. 763-774, 2019.