Evaluation of morphological traits and anti-microbial activity of local ecotypes of Mentha longifolia in Lorestan, Iran

Document Type : Research Paper

Author

Assist. Prof., Department of Agriculture, Payame Noor University, Tehran, Iran.

Abstract

In order to evaluation the diversity of morphological traits and determine antibacterial activity against three bacterial strains including Klebsiella pneumonia, Listeria monocytogenes, and Streptococcus agalactia, three ecotypes of Mentha longifolia were collected from three habitats in Khorramabad, Aleshtar, and Delfan in Lorestan province, Iran. The measured traits were plant height, leaf length and width, number of leaves, branches, and inflorescences, length of inflorescences, and percentage of essential oil. Data were analyzed using one-way ANOVA with five replications. The result showed that there was a significant difference among the ecotypes in terms of leaf length and width, plant height, and essential oil percentage. Khorramabad ecotype had the highest plant height, inflorescence length, and essential oil percentage. A positive and significant correlation was observed between both plant height and leaf width with essential oil percentage. According to stepwise regression and path analysis results, it was concluded that plant height could be considered as the most important index for the selection of parental lines in the breeding programs. Based on the Minimum Inhibitory (MIC) and Minimum Bactericidal Concentration (MBC) indices, it was concluded that the minimum inhibitory and bactericidal concentrations of M. longifolia essential oil ranged from 0.03 to 0.2 mg/mL.The antimicrobial activity showed that L. monocytogenes and S.agalactiae were inhibited by Delfan ecotype essential oil and K. pneumonia was inhibited by the essential oil from the Aleshtar ecotype. In contrast, the three studied bacteria had the lowst susceptibility to the essential oil from Khorramabad ecotype.

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