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Al-Namazi, A. A., Al-Ammari, B. S., Davy, Anthony J. 
ORCID: https://orcid.org/0000-0002-7658-7106 and Al-Turki, Turki A.
(2020)
Seed dormancy and germination in Dodonaea viscosa (Sapindaceae) from south-western Saudi Arabia.
Saudi Journal of Biological Sciences, 27 (9).
pp. 2420-2424.
ISSN 1319-562X
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Abstract
Dodonaea viscosa (Sapindaceae) is widespread in the mountainous highlands of the southwestern part of the Kingdom of Saudi Arabia, where it is a medicinally important species for the people of Saudi Arabia. Seeds of this species were collected from Mount Atharb in the Al-Baha region, at an altitude of 2100 m. The aims of this study were to determine if the seeds of D. viscosa have physical dormancy (i.e. a water-impermeable seed coat) and, if so, what treatments would break dormancy, and what conditions promote germination after dormancy has been broken. The dormancy-breaking treatments included: soaking of seeds in concentrated sulfuric acid (H2SO4) for 10 minutes, immersion in boiling water for 10 minutes and exposure to 50 °C for 1 minute. After seeds had been pre-treated with H2SO4, to break dormancy, they were incubated at constant temperatures from 5 to 35°C, under 12-h photoperiods or in continuous darkness, and germination recorded. Salinity tolerance was investigated by incubating acid-scarified seeds in 0, 100, 200 and 300 mM NaCl in the light at 25°C. Untreated seeds had low final germination (30%). Seeds that had been acid-scarified, immersed in boiling water or exposed to 50 °C all achieved 91% subsequently when incubated at 25°C. Thus, seeds of this species in Saudi Arabia have physical dormancy, which can be broken by all three treatments designed to increase the permeability of the testa. After pre-treatment, there was a broad optimum constant temperature for germination that ranged between 5-25°C but germination was inhibited by higher temperatures (30 and 35°C). Light had little effect on this germination response. Scarified seeds were also sensitive to salinity, with the highest germination in distilled water and complete inhibition in 400 mM NaCl. Seeds that failed to germinate in saline treatments were mostly able to germinate on transfer to distilled water, suggesting osmotic inhibition.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | dodonaea viscosa,physical dormancy,seed scarification,salinity (nacl),seed dormancy,germination,temperature response,light response,seed scarification,light response,seed germination,dormancy,salinity (nacl),physical dormancy,temperature response,agricultural and biological sciences(all) ,/dk/atira/pure/subjectarea/asjc/1100 |
| Faculty \ School: | Faculty of Science > School of Biological Sciences |
| UEA Research Groups: | Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation Faculty of Science > Research Groups > Organisms and the Environment |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 02 Jun 2020 00:15 |
| Last Modified: | 14 May 2023 00:25 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/75426 |
| DOI: | 10.1016/j.sjbs.2020.05.036 |
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