Effects of silver nano particles seed coating on germination and early growth of wheat seedling

In order to investigate the effects of silver nano particles on germination and early growth of wheat (Triticum aestivum L.) seedling، an experiment was conducted in the form of completely randomized design with four replications. The factor A included two cultivars of wheat، and seven levels of seed coating including five different concentrations of silver nano particles solution (S)، ethanol (E) and a control (sh)، were taken as factor B. The results showed that the effects of silver nano particles on germination percent، rate of germination، germination mean time، length of radicle and plumule، dry weight of plumule and seedling، and allometry was significant. Radicle dry weight was not affected by seed coating treatment. Rate of germination، length of radicle and plumule of Verinak cultivar was higher than Chamran cultivar and the dry matter accumulation ability of Chamran was higher than Verinak. Although high concentrations of silver nano particles solution decreased Chamran germination rate، silver nano particles had no effects on this attribute of Verinak cultivar. Radicle and plumule dry matter accumulation was improved under silver nano particles in Verinak cultivar، while this attribute was relatively reduced in Chamran cultivar. The cause of this function could be explained by desirable and undesirable effects of silver nano particles on the length of radicle and plumule in Verinak and Chamran respectively.