Adaptive drought tolerance during germination of Salsola drummondii seeds from saline and nonsaline habitats of the arid Arabian deserts

Author:

Elnaggar Attiat123,El-Keblawy Ali1,Mosa Kareem A.14,Navarro Teresa2

Affiliation:

1. Department of Applied Biology, Faculty of Science, University of Sharjah, PO Box 27272, Sharjah, UAE.

2. Departmento de Biología Vegetal, Universidad de Málaga, P.O. Box 59, 29080, Málaga, Spain.

3. Department of Botany and Microbiology, Faculty of Science, Alexandria University, Egypt.

4. Department of Biotechnology, Faculty of Agriculture, Al-Azhar University, Cairo, Egypt.

Abstract

The effects of temperature, light, salinity, and drought on germination of halophytes have been extensively studied. However, few studies have focused on the germination of plants that grow well in both saline and nonsaline habitats (i.e., habitat-indifferent halophytes). Here, we assess the impacts of population origin, temperature, and light on drought tolerance, as simulated with polyethylene glycol (PEG), during germination of Salsola drummondii Ulbr., a habitat-indifferent halophyte from the arid Arabian deserts. Seeds were collected from both saline and nonsaline habitats and germinated at six concentrations of PEG at three temperatures and two light regimes. An increase in the concentration of PEG resulted in a significant reduction in seed germination, especially at higher temperatures. Seeds from the nonsaline habitat attained significantly greater germination efficiency at concentrations of PEG up to –1.2 MPa, but there was no difference in germination of seeds between the two habitats at concentrations of –1.5 MPa. Seeds from the saline habitat germinated significantly faster at higher concentrations of PEG. Germination was significantly higher in darkness than in light at –1.5 MPa at the lower temperatures, but the opposite was true for the higher temperatures. Seeds from saline habitats had higher levels of dormancy and faster rates of germination at higher concentrations of PEG because of their adaptation to low osmotic potentials.

Publisher

Canadian Science Publishing

Subject

Plant Science,Ecology,Ecology, Evolution, Behavior and Systematics

Reference64 articles.

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2. Baskin, C.C., and Baskin, J.M. 2014. Seeds, ecology, biogeography, and evolution of dormancy and germination. 2nd ed. Elsevier/Academic Press, San Diego, Calif.

3. An introduction to the climate of the United Arab Emirates

4. Bradbeer, J.W. 1998. Seed dormancy and germination. Chapman and Hall, New York, N.Y.

5. Applications of hydrothermal time to quantifying and modeling seed germination and dormancy

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