Although salinity stress mostly reduces germination rate and delays the onset of germination, its effects are modified by interactions with other environmental factors as temperature and light. Salinity can affect germination by affecting the osmotic component......
Salinity impairs seed germination, reduces nodule formation in legumes, retards plant development and reduces crop yield . The plants that grow in saline soils have diverse ionic compositions and a range in concentrations of dissolved salts . These concentrations fluctuate because of changes in water source, drainage, evapo-transpiration, and solute availability. Successful seedling establishment depends on the frequency and the amount of precipitation as well as on the ability of the seed species to germinate and grow while soil moisture and osmotic potentials decrease. These salts interfere with seed germination and crop establishment . Germination and seedling characteristics are the most viable criteria used for selecting salt tolerance in plants. Salinity stress can affect seed germination through osmotic effects.
This is depend upon various parameters mainly soil ,germination, weather conditions and many more.
Increase in salinity causes increase in osmotic potential then decrease in germination rate, the decrease in germination rate under saline condition depends of type of plants for example germination rate of tolerate plants is less affect by salinity in comparing with sensitive plants to saliity.
Although salinity stress mostly reduces germination rate and delays the onset of germination, its effects are modified by interactions with other environmental factors as temperature and light. Salinity can affect germination by affecting the osmotic component......
Salinity impairs seed germination, reduces nodule formation in legumes, retards plant development and reduces crop yield . The plants that grow in saline soils have diverse ionic compositions and a range in concentrations of dissolved salts . These concentrations fluctuate because of changes in water source, drainage, evapo-transpiration, and solute availability. Successful seedling establishment depends on the frequency and the amount of precipitation as well as on the ability of the seed species to germinate and grow while soil moisture and osmotic potentials decrease. These salts interfere with seed germination and crop establishment . Germination and seedling characteristics are the most viable criteria used for selecting salt tolerance in plants. Salinity stress can affect seed germination through osmotic effects.
Different crops differ in their response to salinity. For example rice is more tolerant to salinity than many cereals. Hence the germination also is dependent on the tolerance level of crops. Within the crops the tolerance vary according to varieties. Usually the rice seed germination is affected when the soil electrical conductivity goes beyond 1.0
Interesting discussion..The ability of seeds to germinate at high salt concentration in the soil is crucial importance for the survival and perpetuation of many plant species. However , the effect depends upon , whether or not , the given plant is halophyte in nature..? So , the response will vary depending upon halophyte or non-halophyte in nature...But , straight answer will be salinity will surely reduce the germination due to both specific ion effect as well as osmotic pressure effect ..
Reported good germination (close to control) of large seeds under NaCl between 0.5 and 2%, Na2SO4 and 2NaCl þ KCl þ CaCl between 0.5 and 3%, and 2Na2SO4 þ K2SO4 þ MgSO4 between 0.5 and 5%. For the small seeds, we found stimulating effects of chloride salts (both pure and mixed) under 0.5e1% concentrations, and sulfate salts under 0.5e3%. Both types of seeds showed high germination recovery potential. Salt tolerance limits of the two seed types during germination and at the later stages of development were very similar (4e5%). During plant growth the optimal concentrations of mixed chloride and sulfate salts ranged from 0.5 to 2%. The mechanisms of salt tolerance in the two seed types of S. europaea appear to differ, but complement each other, improving overall adaptation of this species to high salinity. Source : Plant Diversity 38 (2016) 183e189
Results demonstrated that all salts, at lower concentrations, increased the germination rate but not the germination percentages, compared with control (pure water). Conversely, seedlings were differently affected by treatments in respect to salt type and concentration. Growth parameters affected were root and shoot length, root morphology, fresh and dry weight, and water content. An efficient antioxidant mechanism was present in quinoa, activated by salts during ermination and early seedling growth, as shown by the activities of antioxidant enzymes. Total antioxidant capacity was always higher under salt stress than in water. Moreover, osmotic and ionic stress factors had different degrees of influence on germination and development.Source :DOI: https://doi.org/10.1093/aobpla/plu047
We examined effects of different concentrations of NaCl (200, 400, 600 and 800 mM) on germination of four species from fam. Solanaceae and Brassicaceae (Capsicum annum, Solanum lycopersicum, Brasica oleracea and Sinapis alba). By this experiment, we wanted to determine which concentrations of salt would not interfere with germination of seeds these plants. The obtained results showed that seeds of all the species germinate only in the lowest concentration of NaCl (200 mM). However, after rinsing with distilled water, seeds of all the examined species, except S. alba, germinate in great number. When GA3 was added, seeds of C. annum germinated in great number, but seeds of other plants did not germinate.Source :Kragujevac J. Sci. 32 (2010) 83-87.
The effects of different salinities on the germination of Spartina ciliata seeds were tested during 40 days in the laboratory, using six concentrations of NaCI (0,45, 80, 130, 170 and 215 mM) besides three concentrations of seawater (25, 30 and 35%0). In addition, the survival and growth of seedlings were tested in five constant salinity regimes (O, 45, 80 and 170 mM NaCI) as well as in five regimes of simulating seawater overwash. The results showed that seeds possed a high germination capacity over a wide range of salinities (O to 215 mM NaC\). Although concentrations close to full-strength seawater completely inhibited seed germination, the transfer of the ungerminated seeds to freshwater immediately stimulated this. The effects of salinity on seedling growth showed that shoot height and root length were the variables most sensitive to salt stress. Frequent overwash with seawater significantly reduced the survival and growth of Spartina ciliata seedlings. The success in seed germination, survival, and growth of Spartina ciliata in salinities above those normally found in the natural environment could explain the species being distributed throughout salt-stressed foredune habitats in southern Brazil.Source :Acta boI. bras. 13(3): 317-322. 1999
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