Effect of osmo-priming on germination in seven species of Allium L. seeds in drought stress conditions

Drought stress during seed germination of most plants disrupts many physiological processes and ultimately prevents root emergence and reduced germination percentage. In this regard, the effect of osom-priming with different concentrations of polyethylene glycol on the germination characteristics of Allium L. seeds of seven species, including A. cristophii Trautv., A. giganteum Regel, A. longisepalum Bertol, A. pseudobodeanum R.M. Fritsch & Matin, A. stipitatum Boiss., M.B. A. rubellum, M.POP. & Vved. A. vavilovii, in the case of drought stress, was investigated as a factorial in a completely randomized design with three replications. Experimental treatments included priming with different concentrations of polyethylene glycol 6000 (-0.6, -0.9, -1.2 MPa and control) in 5ºC. The results showed that with increasing the concentration of polyethylene glycol, germination indicators increased. The most effective concentrations of polyethylene glycol to improve germination and viability of seedlings were A. pseudobodeanum, A. vavilovii, A. cristophii, A. stipitatum, -1.2MPa, in A. giganteum, -0.9Mpa. However, in two species, A. rubellum and A. longisepalum, control treatment showed the best germination characteristics. The results of cluster analysis of seven species of Allium were divided into five groups. A. pseudobodeanum so that the greatest improvement in germination and viability at high concentrations of polyethylene glycol was separated from other species. Due to the fact that these species are of great agricultural, medicinal and ornamental value, they can be used optimally by modifying and creating suitable varieties.