1Young Researchers ans Elite Club, Islamic Azad University, Jiroft Branch, Iran
2Department of Horticultural Sciences, Islamic Azad University, of Jiroft, Iran
3Department of Horticultural Sciences, Shahrood University, of Shahrood, Iran
The poinsettia's species name pulcherrima means "most beautiful" and that it is! Poinsettia's brilliant red floral display held against rich green foliage has made this unlikely species a holiday favorite. Its appealing presentation of the traditional Christmas colors has so endeared poinsettia that it is now second only to the Christmas tree as the most popular holiday plant. Studies have shown that rooting substrate is one of the effective factors at rooting of hard rhizogenetic plant such as poinsettia. The purpose ofthis studyis todetermine an appropriate concentration of salicylic acid (SA) on rooting of poinsettia. Present study showed that there was a great variation in most of the measured characters at P< 0.05 percent level. The obtained results show that salicylic acid treatments have caused the increase of percent of rooting. The use of Salicylic acid caused a positive effect on rooting. The callus percentage was obtained in control and 400 treatments. This study shows that plant growth regulators salicylic acid have a profound influence on rooting of poinsettia.