Effect of Priming on Improvement of Deteriorated Seed of Tanacetum parthenium

In order to study the effect of of hormo/osmo priming on seed emergence and seedling growth of Tanacetum parthenium (L.) Sch.Bip., a factorial experiment was conducted based on completely randomized design with three replications in greenhouse of Research Institute of Forests and Rangeland, Tehran, Iran in 2015. The factors were A) four conservation methods with foure levls including: 10 to 15 years old seeds perserved in active collection (4 °C) and base collection (-18 °C) deteriorated seeds using artificial accelerated ageing (40 °C, 98% of RH for 48 h) and control (two years old seeds in store as normal collection), and the factor B) priming treatments with six levels including: control (no priming), two osmopriming using PEG (-0.3 and -0.6 Mpa), two hormonal priming using Giberlic acid (GA500 and GA1000ppm) and hydropriming (imbibition with distilled water). The results showed that the highest values of emergence percentage, vigor index, root length, seedling length, seedling dry weight were obtained using GA1000 ppm and PEG -0.6 Mpa for seeds preserved in active collection. For seeds preserved in base collection, the effect of osmopriming (PEG -0.6 Mpa) on seedling characteristics were higher than other treatments. Similarly, in artificial accelerated aged seeds, both osmopriming (PEG -0.6, -0.3 Mpa) had significant effect on aged seeds reinvigorate compare than other treatments.