Effect of Salinity and Drought Stresses on Seed Germination of Thymus satureioides

Document Type : Research and Short Length Article

Authors

1 Ph.D. Student, Faculty of Sciences & Techniques, Moulay Ismail University, Errachidia, Morocco

2 Professor, Faculty of Sciences & Techniques, Moulay Ismail University, Errachidia, Morocco

3 Searcher, Regional Center of Agricultural Research of Errachidia, National Institute of Agricultural Research, Avenue Ennasr, BP 415 Rabat Principale, 10090 Rabat, Morocco

Abstract

Abstract 2020. Salinity stress and drought stress are the major environmental constraint for promoting medicinal plants in the arid lands of Morocco. To extend the cultivation of Thymus satureioides in Tafilalet zone, Morocco, we investigate the effects of salinity and drought stresses on seed germination traits of T. satureioides. Salinity treatments included six concentrations of NaCl (0, 1, 2.5, 5, 7 and 10 g/l) and drought stress; five osmotic potentials of PolyEtylenGlycol 4000 (0, -0.1, -0.3, -0.6 and -0.9 MPa). Results showed that T. satureioides seeds exibited a high germination capacity over a moderate range of salinities (0 to 2.5 g/l). Then, a highly significant decrease in germination capacity and a delayed germination were recorded with the increasing salt concentration, only 38% of seeds germinated at 5 g/l and a complete inhibition was started from 7 g/l and 10 g/l of NaCl. Decreasing osmotic potentials inhibited progressively and significantly seed germination, the germination percentage for -0.1 MPa, -0.3 MPa, and -0.6 MPa were 85.3%, 65.3%, 6.6% respectively. The two stresses (drought and salinity) had negative impacts on seed germination, but the drought effect was more accentuated than salinity in reducing seed germination capacity.

Key words: Thymus satureioides, Germination, Salinity, Drought

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Main Subjects



Articles in Press, Accepted Manuscript
Available Online from 20 November 2021
  • Receive Date: 29 July 2021
  • Revise Date: 12 October 2021
  • Accept Date: 22 November 2021
  • First Publish Date: 22 November 2021