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Compared to other legumes, it is also resistant to many insect pests (Tiwari and Campbell, 1996a; Tiwari and Campbell, 1996b; Berger et al., 1999; Sillero et al., 2005).

Nanoparticles (NPs) are wide class of materials that include particulate substances, which have one dimension less than 100 nm at least (Laurent et al., 2010). The importance of these materials realized when researchers found that size can influence the physiochemical properties of a substance e.g. the optical properties (Khan et al., 2017). NPs with different composition, size, and concentration, physical/ chemical properties have been reported to influence growth and development of various plant species with both positive and negative effects (Ma et al., 2010). Silver nanoparticles have been implicated in agriculture for improving crops. There are many reports indicating that appropriate concentrations of AgNPs play an important role in plant growth (Hojjat and Hojjat, 2015; Kaveh et al., 2013). The application of Nano silver during germination process may enhance germination traits, plant growth and resistance to salinity conditions in basil seedlings (Darvishzadeh et al., 2015). The use of Silver Nanoparticle on Fenugreek Seed Germination under Salinity Levels is a recent practice studied (Hojjat and Kamyab, 2017). Nanomaterials have also been used for various fundamental and practical applications (Kolekar et al., 2011). Although the potential of AgNPs in improving salinity resistance has been reported in several plant species (Ekhtiyari et al., 2011; Younes et al., 2011), its role in the alleviation of salinity effect and related mechanisms is still unknown. Therefore, the main objective of this work was to study the effect of Silver Nanoparticles on salt tolerance in Lathyrus sativus L.