Setayesh Mehr, Zahra and Esmaeilzadeh Bahabadi, Sedigheh and Sabbagh, Kazem Study of seed germination and morphophysiologic characteristics of Anethum graveolens L. by NaCl-induced salt stress. Technical Report. University of Zabol.
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Abstract
Introduction Salt stress is one of the limiting factors of crop production, particulary in arid areas. Salinity causes the damage of seed germination, the decrease of plant growth and finally the decrease of crop yield. Successful growth of seedling depends on the volume of precipitation, the germination and growth ability of seed species during the decrease of soil moisture. The osmotic effects of salt stress disrupt seedling establishment and seed germination. In vegetative plants, the decrease of cell turgescence and elongation rate of different plant parts are the consequences of salt stress. These effects suggest that soil salinity initially affects water uptake. In addition to, the cell division and extension are inhibited through intracellular concentrations of Na+ and Cl- ions. Salt stress inhibits the cell growth through biochemical and physiological mechanism such as photosynthesis and antioxidant processes, accumulation of stable osmolytes and proline synthesis. The osmoprotectants are containing polyols, sugars, proline, sugar alcohols, , inositols that accumulate in cells under salinity. These compounds maintain the integrity of cell membrane by the scavenge of free radicals and inhibit of lipid peroxidation. Phenolic compounds are intracellular antioxidants that accumulate in cells under biotic/abiotic stresses. Reactive oxygen species (ROS) injure to cells in stress conditions. Hydroxyl, superoxide anion radicals and hydrogen peroxide are the main ROS that produce in the plants during respiration process. Because of high reactivity of the free radicals, they easily react with lipids, DNA and hence bearing about malfunction of the cells. The enzymatic protective mechanisms for removing destructive effects of ROS in plant cells are catalase (CAT), ascorbate peroxidase (APX), polyphenol oxidase (PPO) and superoxide dismutase (SOD). The current study, we investigated the salinity effect on seed germination and morphophysiological properties of medicinal plant (Anethum graveolens L.).
| Item Type: | Monograph (Technical Report) |
|---|---|
| Subjects: | S Agriculture > SB Plant culture |
| Depositing User: | Mrs najmeh khajeh |
| Date Deposited: | 01 Dec 2021 05:58 |
| Last Modified: | 01 Dec 2021 05:58 |
| URI: | http://eprints.uoz.ac.ir/id/eprint/2914 |
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