Meysam Keshtkar Garousi - Plant Bio-product Group, National Institute of Genetic Engineering and Biothechnology (NIGEB), Tehran. Iran.Department of Agronomy and Plant Breeding, College of Agricultural Sciences, Shahed University,Tehran, Iran
Forough Sanjarian - Plant Bio-product Group, National Institute of Genetic Engineering and Biothechnology (NIGEB), Tehran. Iran;
Alaeddin Kordenaeej - Department of Agronomy and Plant Breeding, College of Agricultural Sciences, Shahed University,Tehran, Iran.

Today, medicinal plants are one of the most economically important plants. Marjoram, Origanum vulgare is considered as an important medicinal plant. Salinity reduces soil fertility, and it is one of the important factors limiting the production and ultimately the supply of food. The degree of salinity resistance varies for different plants at the germination stage. In this study, the seeds of the plant were grown in the presence of different levels of salinity and the effect of stress on morphological traits at the early stages of plant growth was investigated. This experiment was performed in a completely randomized design with three replications. Fifteen plant seeds were sterilized with ۳۰% sodium hypochlorite then were cultured in MS ۰/۵ X medium on autoclaved ۲ * ۲ cm mesh. Salinity treatments included ۰ (as control), ۵۰, ۱۰۰, ۱۵۰ and ۲۰۰ mM / L sodium chloride (NaCl). Two weeks after culture, the morphological traits of the treated seedlings were compared with the control sample. According to the results, salinity treatment caused significant changes in plant shoot and roots length. In addition, increasing the dry weight of seedlings was observed with increasing salinity stress. According to the data, it can be concluded that different levels of salinity stress have different effects on the seeds of Origanum vulgare.

Origanum vulgare, morphological traits, Salinity