Environmental Stresses in Crop Sciences

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The effect of drought stress and plant growth promoting rhizobacteria on agro-morphological characters of lemon balm (Melissa officinalis L.)

Document Type : Original Article

Authors

1 MSc. Student of Seed Science and Technology, Biotechnology Research Institute, Shahrekord University, Iran

2 Department of Agronomy, Shahrekord University, Shahrekord, Iran

3 Faculty of Agricultural Science, Payame Noor University, Iran

Abstract

Introduction
Lemon Balm (Melissa officinalis L.) as an aromatic medicinal plant belongs to the genus mentha and has a variety of uses. Nowadays, due to the increasing popularity of medicinal plants, the area under these plants’ cultivation continue to increase. However, problems such as environmental stresses limit the development of these plants’ cultivation. Drought stress is one of the most important factors limiting the growth and yield of agricultural products around the world. The use of growth-promoting rhizosphere bacteria (PGPR) as a biofertilizer with the aim of reducing the damage caused by environmental stresses is considered as one of the new solutions in sustainable agriculture in arid and semi-arid regions of the world. In this regard, this study was designed and conducted to investigate the effect of plant growth promoting rhizobacteria on agro-morphological characters of Lemon Balm under water deficit stress
 
Materials and methods
This experiment was done during 2018-2019 growing season at the research field of the faculty of agricultural, Shahrekord University as split-plot factorial in a Randomized Complete Block Design with three replications. water deficit in three levels (full irrigation, 75 and 50 present of full irrigation) and inoculation with PGPRs at five levels (Control (No bacterial inoculation), Inoculation with Azospirillum lipoferum, Bacillus sp. strain A, Bacillus amyloliquefaciens and Streptomyces rimosus) considered as main and sub factors, respectively. The amount of irrigation water was calculated using plant water requirement. Leaf area was measured with Digimizer software. After harvesting, first the plant height was measured and then the number of main and sub-branches was counted and the leaf dry weight, stem dry weight and biological yield were determined. SAS and Excel softwares implemented for statistical analysis and the means were compared using LSD test.
 
Results and discussion
The results showed that the effect of bacteria and drought stress on plant height, number of main branches, number of sub-branches, leaf dry weight, stem dry weight, leaf area, essential oil percent, biological yield and essential oil yield were significant. With increasing stress intensity, all studied traits were decreased. So that by applying 50% of full irrigation, plant height, leaf area and biological yield were reduced by 39.4%, 67.4% and 60.5%, respectively, compared to full irrigation treatment. While inoculation of plants with PGPRs caused a significant increase in these traits compared to the control treatment (No bacterial inoculation). The interaction effect of the studied treatments on the number of main branches, number of sub-branches, stem dry weight, leaf area, essential oil percent, biological yield and essential oil yield was significant. At full irrigation treatment, the highest biological yield was observed in inoculated treatments of Azospirillum lipoferum and Bacillus amyloliquefaciens, which increased biological yield by 58.2% and 53.09%, respectively, compared to the control. At 75 and 50% of full irrigation treatments, the highest biological yield and essential oil yield were observed in inoculated treatments of Azospirillum lipoferum and Bacillus amyloliquefaciens. In all the studied treatments, increasing the intensity of drought stress reduced the biological and essential oil yield, but inoculated bacteria were able to increase the biological and essential oil yield compared to the bacterial control treatments.
 
Conclusion
The results of this study showed that increasing water deficit stress causing significant reduction of all studied traits. However, the use of bacteria reduced the effects of stress and increased these traits compared to non-inoculated at all water deficit stress levels. Also among bacterial treatments, Bacillus amyloliquefaciens, A. lipoferum and S. rimosus had the most effect on stress improvement.

Keywords

Main Subjects

References
 
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Environmental Stresses in Crop Sciences
Volume 15, Issue 2
Open Access Policy
June 2022
Pages 393-405
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History
  • Receive Date: 05 October 2020
  • Revise Date: 12 November 2020
  • Accept Date: 17 November 2020
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