Photosynthetic responses of a salt secretor mangrove, Avicennia germinans, exposed to salinity stress

Authors

  • Daniel Gonzalez-Mendoza Instituto de Ciencias Agrícolas, Universidad Autónoma de Baja California (ICA-UABC), Carretera a Delta s/n Ejido Nuevo León 21705, Baja California, México
  • Francisco Espadas y Gil Unidad de Biotecnología, CICY, Merida, Yucatan, Mexico
  • Jose Francisco Rodriguez Departamento de Recursos del Mar, Cinvestav Unidad Merida, Merida, Yucatan, Mexico
  • Silvia Monica Aviles Marin Instituto de Ciencias Agrícolas, Universidad Autónoma de Baja California (ICA-UABC), Carretera a Delta s/n Ejido Nuevo León 21705, Baja California, México
  • Jorge M. Santamaría Unidad de Biotecnología, CICY, Merida, Yucatan, Mexico
  • Omar Zapata-Perez Departamento de Recursos del Mar, Cinvestav Unidad Merida, Merida, Yucatan, Mexico

Keywords:

Photosystem II, chlorophyll a fluorescence

Abstract

In the present study, the effect of variable salinity (0, 15 and 60‰ NaCl) on photosynthetic apparatus was studied in plants (Avicennia germinans seedlings) of a salt secretor mangrove, by measuring chlorophyll fluorescence parameters and gas exchange. Plants treated with NaCl showed a decrease in the maximum net photosynthetic rate (P n) and stomatal conductance (g s) as salinity increased from 0 to 60‰. The yield for primary photochemistry (TRo/ABS) and the efficiency with which a trapped exciton can move an electron into the electron transport chain (ETo/TRo), the performance index of Photosystem II (PIABS), and the total number of active reaction centers per absorption (RC/ABS) also decreased when exposed to the highest salinity stress (60‰). These results indicated that the main targets in PSII affected by elevated salinity were inactivation of reaction centers and inhibition of the electron transport at the acceptor side of Photosystem II.

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Published

2011-07-01

Issue

Vol. 14 No. 3 (2011)

Section

Research article

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