marziah rahmani

Haplophyllum tuberculatum is a valuable medicinal plant containing various chemical compounds that have various medicinal and industrial uses. It grows in the habitats of Iran, including the south and west of Iran. In this research, the impact of some soil and climate factors was evaluated on the performance and chemical compounds in essential oils in different phenological stages. Some of these compounds were reported for the first time. In order to determine the constituents of the essential oil, the aerial parts of the plant were specifically collected at different stages of the phenology and dried under environmental conditions. The variables used include soil, climate, physiography and essential oil compounds in different regions. A total of 38 types of chemical compounds of plant essential oil were identified in Khuzestan, Bushehr and Kohgiluyeh provinces and were identified in different phenological stages. The results of PCA showed that the composition of β-phellandrene and bornyl acetate were influenced by the organic matter and number of frost days. The most important components of the essential oil were identified as p-simene, beta-phlandrene, linanol, bornyl acetate, n-hexadecanoic acid, (E) 9-octadecanoic acid and n-pentacosane. A total of 38 types of chemical compounds of plant essential oil were identified in the habitats and were identified in different phenological stages. The results showed that the highest percentage of essential oil yield was related to the vegetative stage and in Gachsaran region. Amount of organic compounds were higher in the vegetative stage compared to the flowering stage, and the percentage of major compounds showed significant differences in different habitats and was higher in the flowering stage. According to the results, the most suitable habitats with the highest yield and quality of essential oil are in the Gachsaran and Ramhormoz regions, respectively, and environmental factors such as soil organic matter and temperature stress play an important role in the composition of essential oils in the habitats, which can be used to select suitable habitats and ecotypes for managing exploitation, plant breeding and production.