The effect of mycorrhizal fungi and phosphate solubilizing bacteria on some traits of marjoram medicinal plant(Origanum majorana L.) under salinity stress

Subject Areas : Journal of Plant Ecophysiology

M. Yosefirad ¹ ( گروه زراعت و اصلاح نباتات، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران )
A. Masoumi ² ( گروه زراعت و اصلاح نباتات، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران )
M. Asghari ³ ( باشگاه پژوهشگران جوان و نخبگان، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران )

Received: 2014-12-28 Accepted : 2015-02-26 Published : 2016-06-01

Keywords: Pseudomonas fluorescens, Essential oil, Glomus mosseae, Biological fertilizers,

Abstract :

In order to investigate the effect of mycorrhizal fungi and phosphate solubilizing bacteria )PSB( on marjoram plant under salt stress condition, a greenhouse examination was done as factorial based on randomized complete blocks design with three replication in 2013 in Qom salafchegan region. The first factor, salinity levels including control, 100 and 150 mM NaCl salt , the second factor in two level of non use and use of mycorrhizal fungi (Glomus mosseae strains) and the third factor in two level of non use and the use of phosphate solubilizing bacteria (Pseudomonas fluorescens strain) was. Results of variance analysis showed that the main effects of salinity, mycorrhiza and PSB was significant on studied traits (P<0.01). As well as interaction of mycorrhiza and salinity on the flowers number per plant, number of branches, plant dry weight and oil percentage, interaction mycorrhiza with PSB on plant height, number of flowers per plant, number of leaves per plant, number of branches and dry plant and triple interaction of treatments on the number of leaves per plant was significant (P<0.05). According to the examination results, the studied traits decreased with increasing salinity so that 150 mM salt had the most negative effects on the plant. It was also observed mycorrhiza and PSB in favorable conditions and salinity stress improved studied traits. The results showed that the combined application of mycorrhiza and PSB had better outcome in different levels of salinity stress.