The effect of fluorescent pseudomonads on the phytochemical characteristics of Satureja rechingeri under field conditions
Subject Areas : Medicinal Plants
Samaneh Samavat
1
(Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran)
Mahdiyeh Salehi Vozhdehnazari
2
(Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran)
فاطمه سفیدکن
3
(موسسه تحقیقات جنگلها و مراتع کشور)
Keywords: Essential oil, Medicinal plant, Reshingari savory, Field, PGPR, Pseudomona fluorescens,
Abstract :
In recent years, the use of indigenous isolates of fluorescent pseudomonads to improve essential oils (EOs)’ quantity and quality of various medicinal plants has been considered. In this study, samples were taken from the rhizosphere of Satureja rechingeri plants located in the habitats of Ilam province, Iran. Fluorescent pseudomonads were screened by producing fluorescent green pigment in King's B medium. From the 22 isolates, PF4, PF11, and PF19 were recognized as the superior isolates due to producing the highest amount of pigment and were identified with the help of biochemical tests. The 16-leaf seedlings of savory were transferred to the field two months after planting the seeds in the greenhouse. Each of the two-year-old plants was treated with a suspension (107 cfu/ml) of the superior isolate, by adding it to the soil in a randomized complete block design (n=3). Seven months after applying the treatments, which coincided with full flowering stage in the third year of planting, EO was extracted from the flowering branches by water distillation method. The main components of the EOs were identified with the GC-FID set. The percentage yield of the EO was calculated based on the plant dry weight. According to the results, PF4, PF11, and PF19 belonged to biovars II, III, and V of Pseudomonas fluorescens, respectively. Based on GC-FID analysis, several compounds such as carvacrol, alpha-thogen, alpha-pinene, myrcene, para-cymene, gamma-terpinene, terpinolene, linalool, trans-caryophyllene, beta-bisabolene, and spatholenol were detected in Reshingari's EO. The carvacrol amount as the main component of EO increased from 82.8% in control to 91.7% in PF11 treatment. The percentage of plants’ EO yield increased from 3.02% in the control to 4.4% in the PF11 treatment, significantly (P<0.05). Therefore, the application of efficient and indigenous rhizobacteria from fluorescent pseudomonads can improve the quantity and quality of Reshingari EO under field conditions.
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