SciELO - Scientific Electronic Library Online

 
vol.46 número3Seletividade de pesticidas utilizados em arroz sobre Telenomus podisi e Trichogramma pretiosumAzospirillum brasilense afeta a atividade antioxidante e o teor de pigmentos foliares de Urochloa ruziziensis sob déficit hídrico índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Pesquisa Agropecuária Tropical

versão On-line ISSN 1983-4063

Resumo

PINHEIRO, Daniel Teixeira et al. Germination and antioxidant action in melon seeds exposed to salt stress. Pesqui. Agropecu. Trop. [online]. 2016, vol.46, n.3, pp.336-342. ISSN 1983-4063.  http://dx.doi.org/10.1590/1983-40632016v4640431.

Salinity influences all germination stages and may adversely affect the seedlings establishment in the field. This study aimed at assessing the effects of salt stress on the physiological potential of melon (Cucumis melo L.) seeds. Germination and activity of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) enzymes were assessed at the osmotic potentials of 0.0 MPa, -0.1 MPa, -0.2 MPa, -0.3 MPa, -0.4 MPa and -0.5 MPa. The enzymatic activity was assessed after 24 h, 48 h and 72 h of imbibition. Seed germination was zero at -0.5 MPa and 91 % and 85 % at -0.1 MPa and -0.2 MPa, respectively. In general, the activity of SOD, CAT and POX enzymes increased with the salt-induced stress, in the different times of imbibition, and these increases were more evident at -0.4 MPa and -0.5 MPa. The salt stress induced by NaCl diminishes the germination rate of melon seeds, particularly from the osmotic potential of -0.2 MPa. There is a significant increase in the activity of SOD, CAT and POX enzymes, mainly after 48 h of exposure.

Palavras-chave : Cucumis melo L.; enzymes; salinity; sodium.

        · resumo em Português     · texto em Inglês     · Inglês ( pdf )