The Study of Salicylic acid on seed germination, growth,development and changes in anatomical structure,of Eucalyptus polyanthemos L

Eucalyptus genus is amember of the myrtaceae family. Eucalyptus polyanthemos is an ornamental plant which maintains essential oils. This is the study on anatomical structure،using routine cytohistological methods and also evaluation of SA effects on stability and quality of platns. solutions of SA with different concentrations (0. 1 and 0. 25 g. l-1) ware affected on plant specimens and compared with natural specimens (in summer and fall). The organs root، stem and leaf of eucalyptus were investigated. The result showed that the treated specimens were stronger than control specimens. Treatment with SA 0. 1 gl-1 concentration (spray and watering) caused acceleration of formation and number of latral shoots that probably related to phenolic properties of SA. In this plant support tissue is more than control plants. Also in the treated plants are increased collenchymatous and ligneous tissue. But SA0. 25g. l- 1concentration (spray and watering) caused decrease of collenchymatous cells and increase of sclerenchyma tissue. SA caused increase stability of plants and stronger than control plants. Have a positive effect on vegetative growth of the treated plants. Also SA caused acceleration of lenghth of shoot، (branches) and number of leaves. Watering of samples with 0. 1 g. l-1 concentration caused increase of vessels and length of rayon and also vascular bundels are increased. Anatomical investigation showed that leaf structure in control plants and the treated plants are similar. In Anatomical structure of root in the treated plants with concentration 0. 25g. l-1SA peripheral of root were suberized and degenerated very speed and the pith parenchyma. Comparsion Structure of vegetative meristem in the control plants treated samples with SA indicated that in treated samples with concentration SA 0. 25g-1 (watering and spray) vegetative meristems are spread and flat. With increased tunica layers. Augmentation of SA concentration decrease number of stomata and with increase of SA concentration the number of stomata will increase. Treatment of 0. 5، 1، 1. 5 g. l-1 SA were in hibited germination and treatment of 0. 1، 0. 25 g. l-1 decrease growth of seedlings in comparsion with control.