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Effects of salinity and temperature stress on Ecophysiological characteristics of exotic cordgrass, Spartina alterniflora
Authors:Shi Fuchen and Bao Fang
Institution:1. CIIMAR/CIMAR, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal;2. Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Universidade do Porto, Rua dos Bragas, 289, 4050-123 Porto, Portugal;1. Instituto Patagónico para el Estudio de los Ecosistemas Continentales (IPEEC–CENPAT–CONICET), Puerto Madryn, Chubut, Argentina;2. Universidad Nacional de la Patagonia San Juan Bosco, Boulevard Brown 3051, 9120 Puerto Madryn, Chubut, Argentina;3. Instituto Argentino de Oceanografía (IADO–CONICET), Bahía Blanca, Buenos Aires, Argentina
Abstract:Salintiy and temperature are two important ecological factors which affect the distribution and abundance of Spartina alerniflora Loisel. To find out how cordgrass adapts to the environmental conditions in the introduced range, we studied the dynamics of a series of important physiological components including superoxide dismutase (SOD), guaiacol peroxidase (POD), catalase (CAT), malondialdehyde (MDA), soluble sugar and free proline under different salinity and temperature stresses. The results showed that low NaCl concentration (lower than 100 mmol·L−1) enhanced the growth of S. alterniflora. On the contrary, high NaCl concentration (higher than 100 mmol·L−1) inhibited the growth of S. alterniflora. To a certain extent, S. alterniflora was able to be acclimated to the osmotic pressure created by external solution concentration by adjusting the activities of POD, SOD and CAT, and the contents of free proline and soluble sugar. S. alterniflora varied in its responses to environment in different parts of the plant under 5°C and 38°C temperature stress. Compared with roots, leaves accumulated more soluble sugar, and CAT activities in leaves were higher, whereas SOD and POD activities in leaves were much lower than those in roots.
Keywords:Spartina alterniflora  salinity stress  temperature stress  antioxidat enzyme  malondialdehyde (MDA)  soluble sugar  free proline
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