فاطمه بازدید وحدتی

 The study area, with 5000 hectares is located in northwestern of the city of Hashtpar, Talesh, Gilan and between 1000-1700 m a.s.l. Based on floristic studies from 1393 through 1394, 177 vascular plant species were identified belonging to 119 genera and 56 families. The Dicots with 131 taxa were the richest group of flora followed by monocots with 33 taxa, and Monilophytes with 13 taxa. Our research showed dominant life forms include Geophytes (36%), followed by Hemicryptophytes (30%). From the chorological point of view, we determined that the largest proportion of the flora belongs to the Euro-Siberian elements (27.5%) followed by Euro-Sibirian / Irano-Turanian elements (20%), Pluriregional (19.3%), Euro-Sibirian/ Mediterranean/ Irano-Turanian (15.7%), Euro-Sibirian/ Mediterranean (9.6%), Cosmopolitan (7.5%) and Irano-Turanian/ Mediterranean (1.3%). Also Lilium ledebourii a rare flower is reported in these forest areas which was from a new locality in North Iran, indicating the old Tertiary history of this forest.

Heat shock proteins belong to a big family of proteins which are heat-tension dependent and are inductable by heat-stress. They can save the living organisms against suddenly fluctuation of environmental conditions and cause the stability of other protein. Pontogammarus maeoticus is one of the most abundant amphipods at the south of Caspian Sea coast. In this study the presence of heat shock proteins in Pontogammarus (male and female species) by treating at laboratory conditions and levels of temperature (20, 25 and 30 oC) was investigated. Samplings were carried out at coast of Hassan Rood (guilan province). The levels of proteins were determined by Bradford and ELISA methods. Statical analyses of data were carried out by one-way ANOVA and Duncan test. The results showed that by temperature increasing, the levels of Heat- shock proteins and absorbtion of ELISA were increased and the highest absorbance was observed in treating at 30 oC after four hours. Increasing the treating temperature between 5 until 10 oC more than the optimal value causes the more synthesis of heat shock protein 70 with molecular weights of 66.5 and 90 KD both in male and female species of Pontogammarus. In other words the results of this study express that by increasing the temperature the level of heat shock protein 70 will be increasing.

Psilotum nudum is an ancestral epiphytic of the monilophytes which has been recently reported from Hyrcanian forests. It was already introduced as an epiphytic species from some patchy habitats in the lowland parts of Hyrcanian forests. Moreover، Psilotum nudum was reviewed using morphological and anatomical characteristics in two different populations in central parts of Hyrcanian zone. The results showed that there were no significant differences between morphological and anatomical characteristics. The aerial stems of the plant were linear، chlorophyllous، and dichotomously branched. Leaves were much reduced، simple، scale-like، and without ligules. Synangium was composed of 3-locular capsule-like sporangia. Also، stele type in apex aerial stem and aerial stem was actinostele; and it was haplostele type in rhizome. In this paper، a new locality of this species growing on the rocky sites was reported in Ata-kuh of Guilan.

The study area with 170 hectares is located in the north of Rudbar and between 1010-1560 m a.s.l. There is not any harvesting in the study area due to a lack of a road network. This research has been carried out to identify the floristic composition, life forms and chorology of all plants in this area. The final results of the studies on floras showed that 47 plant species belonged to 46 genera and 37 families. The dicots with 34 taxa were the richest group of flora followed by monocots with 7 taxa, and Pteridophytes with 6 taxa. Dominant life forms include geophytes (49%), followed by phanerophytes (23.4%). From the chorological point of view, the largest proportion of the flora belongs to the Euro-Siberian elements (42.6%) followed by Pluriregional elements (14.9%), Euro-Sibirian/ Mediterranean/ Irano-Turanian and Euro-Sibirian/ Mediterranean (10.6%).