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Salicylic acid regulates sugar metabolism that confers tolerance to salinity stress in cucumber seedlings



Salicylic acid regulates sugar metabolism that confers tolerance to salinity stress in cucumber seedlings



Scientia Horticulturae 129(4): 0-636



Salicylic acid (SA) plays a critical role in plant development and defense responses to biotic and abiotic stresses. Sugars can act as osmotic adjustors or nutrient and metabolic signals in the activation of plant defense responses. To uncover the effects of SA on sugar metabolism, we assayed the altered components and levels of sugars in cucumber seedlings treated with SA. After SA treatment, the levels of glucose, fructose, raffinose and stachyose were increased in both leaves and roots. In contrast, sucrose and starch responded differently in leaves and root, decreasing in leaves but accumulating in roots. These changes could be. Highlights: Exogenous application of SA could regulate the sugar contents and components in cucumber seedlings. Sugar metabolism-related enzymatic activities could be up- or down-regulated by exogenous application of SA. Soluble sugars accumulated during exogenous SA treatment could function as osmotic regulators. SA pretreatment could confer the seedlings an enhanced tolerance to salinity stress.

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Accession: 036108112

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DOI: 10.1016/j.scienta.2011.05.005


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