Relation to phonology, phenolics content and alleopathic effect of Artemisia khorassanica Krash. on growth and physiology of Bromus kopetdaghensis Drobov

Artemisia is a widely distributed genus from Asteraceae. Some species of the genus despite having allelopathic effects, provide favorable microclimatic conditions for the establishment of range plants under its canopy. Therefor, study of nurse plant, s allelopathic effect such as Artemisia korassanica Krasch. on understory like Bromus kopetdaghensis Drobov. is necessary. In this research, sampling was carried out in a range site in Baharkish, Ghochan by systemic randomized method at four different stages of the growth and development of shoot and root of A. khorassanica. we studied effect of water extraction on level (3% W/ V) of shoot and root of A. khorassanica on dry weight, chlorophyll content and soluble carbohydrate content of the shoot and root in B. kopetdaghensis seedling, and also we studied the amount of phenolic compounds and their changes during the different stages of growth and development in A. khorassanica. Results indicated that shoot extract of Artemisia had stronger inhibitory effect than the root extract and caused significant decrease on thedry weight and growth of leaf and root in B. kopetdaghensis. Total phenolics content in shoot extract as well as its inhibitor effect decreased gradually from the beginning towards the end of growth season. According to the results of the present research, it seems that the most suitable time for planting of Bromus seeds under the Artemisia canopies is in October, when Artemisia plants are in the seed rippening stage.