Effect of Gibberellic Acid and Stratification on Seed Germination of wild pistachio (Pistacia vera L.) in Khajeh Kalat Forest, Razavi Khorasan Province, Iran

Seed Germination of Pistachio is difficult naturally because of hard shell. Therefore, study and research on germination increasing of this species is very important. This study was conducted to investigate different treatments of gibberellic acid and stratification on seed germination of Pistachio (Pistacia vera) in Khajeh Kalat forest, which is located in the Serakhs and Kalat county in north west of Iran. To do so, Firstly seeds of Pistachio were collected from 23 land units of study area and after that, seven treatment of gibberellic acid and stratification in three replications were done on seeds. Then germination percent and speed, germination value and average time of germination were measured. Regarding to results of this study, there were significant relations between treatments and different factors of germination (p<0.01). Stratification treatments have more effects on germination compare to gibberellic acid. Also, Sixth and eighth weeks stratification have more effects on germination between other treatments. The lowest amount of germination was in 500 ppm acid gibberellic in 12 hours as well.