Abstract
BackgroundMedicinal plant species have been used by the ancestors around the world since ancient times. Rosmarinus officinalis is one of the most used medicinal plants, which belongs to the family Lamiaceae. To investigate the effects of different levels of salinity stress along with the induction of bacterial growth stimulation on the amount of essential oil composition in R. officinalis, an experiment was conducted in a randomized complete block design with 12 treatments and five replications. Salinity treatments included 0 (control), 2.5 (T1), 5 (T2), 7.5 (T3), 10 (T4) and 12.5 (T5) NaCl g/L, and the bacterium was pseudomonas fluorescence.ResultsThe percentage of essential oils showed a significant relationship with increasing salinity either alone or in composition with plant growth-promoting rhizobacteria (PGPR) inoculation treatments and it increased with increasing salinity levels to treatment 4 (T4, 10 g/L NaCl) but decreased with further increases in salinity levels in treatments without using PGPR and it was constant in treatment with using PGPR. Phellandrene, one of the main compounds of essential oils, showed a trend like the whole amount of essential oils in both group of treatments.ConclusionAbiotic and biotic factors may influence the different mechanisms and limit the interactions between plant and beneficial bacteria, resulting in less-than-acceptable performance in plant growth promotion and management of diseases. In this context, the results revealed that the application of PGPRs can help improve the essential oil yield in R. officinalis even in salinity conditions.
Highlights
Medicinal plants species and aromatic plants have been used by the ancestors around the world since ancient times [32]
The results showed that the amount of essential oils increases with increasing salinity levels to treatment 4 (T4, 10 gram per liter (g/L) NaCl) but decreased with further increases in salinity levels (Table 3, Figs. 1 and 2)
The results of treatments along with plant growth-promoting rhizobacteria (PGPR) inoculation showed that the amount of essential oils increases with increasing salinity levels to treatment 4 (T4, 10 g/L NaCl) and it is constant with further increases in salinity levels (Table 3, Figs. 1 and 2)
Summary
Medicinal plants species and aromatic plants have been used by the ancestors around the world since ancient times [32]. (rosemary) belongs to the family Labiatae or Lamiaceae and occurs as a shrub, under the shrub or herbaceous [3]. It is a dense aromatic plant with dark green lavender-like leaves and is a native of the Mediterranean region. Rosmarinus officinalis is one of the most used medicinal plants, which belongs to the family Lamiaceae. To investigate the effects of different levels of salinity stress along with the induction of bacterial growth stimulation on the amount of essential oil composition in R. officinalis, an experiment was conducted in a randomized complete block design with 12 treatments and five replications. Salinity treatments included 0 (control), 2.5 (T1), 5 (T2), 7.5 (T3), 10 (T4) and 12.5 (T5) NaCl g/L, and the bacterium was pseudomonas fluorescence
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