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Semerdjieva I, Cantrell CL, Zheljazkov VD, Radoukova T, Koleva-Valkova LH, Astatkie T, Kačániová M, Borisova D. Chemical profile, antioxidant and antimicrobial activity of Pinus heldreichii Christ. Distributed in Bulgaria. Heliyon 2024; 10:e22967. [PMID: 38187304 PMCID: PMC10770424 DOI: 10.1016/j.heliyon.2023.e22967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 11/09/2023] [Accepted: 11/22/2023] [Indexed: 01/09/2024] Open
Abstract
Pinus heldreichii Christ. (Bosnian pine), a Tertiary relict and Balkan sub-endemic, has not been comprehensively studied for its essential oil (EO) profile and bioactivity of its different plant parts. This study aimed to determine the EO yield, composition and antimicrobial activity from different parts of P. heldreichii at three different populations (mountains) in Bulgaria. Furthermore, the study assessed the antioxidant activities of plant tissue, including leaves (needles), twigs wood, male and female cones. The EOs yield from different plant parts ranged from 0.09 % (leaves) to 0.74 % (wood of twigs), with monoterpenes being the predominant class. Limonene, α-pinene, β-caryophyllene, germacrene D, β-pinene, and β-myrcene were detected in the EO extracted from all analyzed trees. However, these compounds were not found in the EO extracted from all plant parts of the same trees. Four chemical groups (chemotypes) were identified for EO from twigs, and three chemotypes were identified for EO from leaves. The chemotypes were based on the percent ratio of the main EO constituents (>5 %). Leaves tissue showed the highest values in terms of polyphenols and flavonoids, as well as higher ABTS radical scavenging activity, while the highest antimicrobial activity against Staphylococcus aureus subsp. aureus was seen in the EOs obtained from twigs. This is the first study to identify several chemotypes based on leaf and twigs EO of P. heldreichii distributed in Bulgarian flora. Furthermore, the EO of twigs tips (TT), male cones (MC), and wood of one-two-year-old twigs (WT) of the same trees were reported for the first time. The total polyphenol, flavonoid content, and radical scavenging activity of tissues of annual twigs wood and biennial twigs wood, leaf tissue, MC tissue, and the twigs tips tissue is also reported for the first time in the accessible literature. These findings highlight the potential of P. heldreichii to provide EOs with varying compositions and bioactivities, making them suitable for nutraceutical, pharmacological, and potentially food additive applications. Furthermore, the identification of chemotype accessions in this study suggests their selection for the development of new forest crop as a source for natural products with desirable composition and bioactivity.
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Affiliation(s)
- Ivanka Semerdjieva
- Department of Botany and Agrometeorology, Agricultural University, Mendeleev 12, 4000 Plovdiv, Bulgaria
- Department of Plant and Fungal Diversity and Resources, Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Charles L. Cantrell
- Natural Products Utilization Research Unit, United States Department of Agriculture–Agricultural Research Service (USDA-ARS), University, MS 38677, USA
| | - Valtcho D. Zheljazkov
- Department of Crop and Soil Science, Oregon State University, 3050 SW Campus Way, 109 Crop Science Building, Corvallis, OR 97331, USA
| | - Tzenka Radoukova
- Department of Botany and Biological Education, University of Plovdiv Paisii Hilendarski, 24 Tzar Asen, 4000 Plovdiv, Bulgaria
| | - Lyubka H. Koleva-Valkova
- Department of Plant Physiology, Biochemistry and Genetics, Agricultural University, Mendeleev 12, 4000 Plovdiv, Bulgaria
| | - Tess Astatkie
- Faculty of Agriculture, Dalhousie University, Truro, NS B2N 5E3, Canada
| | - Miroslava Kačániová
- Institute of Horticulture, Faculty of Horticulture and Landscape Engineering, Slovak University of Agriculture, 949 76 Nitra, Slovakia
- School of Medical & Health Sciences, University of Economics and Human Sciences in Warsaw, Okopowa 59, 01 043 Warszawa, Poland
| | - Daniela Borisova
- Administration of Vrachanski Balkan Nature Park, Executive Forest Agency, Ministry of Agriculture and Food, 3000 Vratsa, Bulgaria
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Zheljazkov VD, Semerdjieva IB, Borisova D, Yankova-Tsvetkova E, Koleva-Valkova LH, Petrova G, Dincheva I, Stevens F, Wu W, Astatkie T, Ivanova T, Stoyanova A, Dzhurmanski A. Phytochemical and biological investigations on Centranthus kellereri (Stoj., Stef. & T. Georgiev) Stoj. & Stef. and C. ruber (L.) DC. and their potential as new medicinal and ornamental plants. PLoS One 2023; 18:e0293877. [PMID: 37934763 PMCID: PMC10629660 DOI: 10.1371/journal.pone.0293877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 10/17/2023] [Indexed: 11/09/2023] Open
Abstract
INTRODUCTION Centranthus kellereri is a Bulgarian endemic plant species, found only in two locations in the world: The Balkans Mountains (Stara Planina), above the town of Vratsa, and The Pirin Mountains, above the town of Bansko, Bulgaria. Being endemic and endangered species precluded any significant research on it. The hypothesis of this study was that the populations of C. kellereri may represent genetically, phytochemically, and morphologically distinct forms and these will differentiate from C. ruber. Furthermore, C. kellereri possibly imperfect embryology may preclude its more widespread distribution under natural conditions. RESULTS This study revealed the phytochemical profile, antioxidant activity, embryology, surface microstructural morphological traits, and genetic differences between the C. kellereri plants from the only two natural populations and compares them to the ones of the related and better-known plant C. ruber. The essential oil (EO) content in aboveground plant parts and in roots was generally low and the EO composition varied significantly as a function of plant part, year of sampling, location, and species. Methylvaleric acid was a major EO constituent in the C. kellereri EO, ranging between 60.2% and 71.7% of the total EO. The EO included monoterpenes, sequiterpenes, long-chain alkanes and fatty acids. Phytochemical analyses of plant tissue revealed the occurrence of 32 compounds that were tentatively identified as 6 simple phenolics, 18 flavonoids, 1 quinone, 1 lipid, 1 alkaloid, 2 diterpenes, and 3 triterpenes. There were differences in detected compounds between the C. kellereri plants at the two locations and between the roots and shoots in both species. The total phenols and flavonoids varied between the two species but were also dissimilar between the plants from the two populations of C. kelleri. Free radical scavenging activity, measured with ABTS and DPPH in aqueous and methanol extracts, had similar values; however, overall, C. kellereri from Vratsa showed the highest antioxidant activity while C. ruber had the lowest activity. Genetic analyses showed a clear differentiation between C. kellereri and C. ruber, and between the two populations of C. kellereri. Embryological studies revealed the peculiarities of the male and female generative spheres of the two species that were defined as being sexually reproducing. The pollen had high viability; however, the low viability of seeds demonstrated possible high sensitivity of C. kellereri to the environmental conditions, perhaps the main factor modifying and restricting the population sizes. The SEM analyses exposed differences in surface microstructural traits between the species (C. kellereri and C. ruber) but also between the two populations of C. kellereri. The observed dissimilarities in genetic makeup, micromorphological characteristics, and phytochemical composition strongly indicate that the two populations can be classified as distinct subspecies or varieties of C. kellereri; var. pirinensis and var. balkanensis. Further research is needed to introduce C. kellereri into culture and develop it as a high-value specialty crop or ornamental in order to conserve C. kellereri natural populations. C. kellereri may be utilized as a source for phytochemicals of interest and as an ornamental plant like C. ruber; however, it may have a greater environmental plasticity and adaptation as evidenced by its current locations.
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Affiliation(s)
- Valtcho D. Zheljazkov
- Department of Crop and Soil Science, Oregon State University, Corvallis, OR, United States of America
| | - Ivanka B. Semerdjieva
- Faculty of Agronomy, Department of Botany and Agrometeorology, Agricultural University, Plovdiv, Bulgaria
- Department of Plant and Fungal Diversity, Division of Flora and Vegetation, Institute of Biodiversity and Ecosystem Research, Sofia, Bulgaria
| | - Daniela Borisova
- Administration of Vrachanski Balkan Nature Park, Executive Forest Agency, Ministry of Agriculture, Food and Forestry, Vratsa, Bulgaria
| | - Elina Yankova-Tsvetkova
- Department of Plant and Fungal Diversity, Division of Flora and Vegetation, Institute of Biodiversity and Ecosystem Research, Sofia, Bulgaria
| | - Lyubka H. Koleva-Valkova
- Department of Plant Physiology, Biochemistry and Genetics, Agricultural University, Plovdiv, Bulgaria
| | - Galya Petrova
- Department of Plant and Fungal Diversity, Division of Flora and Vegetation, Institute of Biodiversity and Ecosystem Research, Sofia, Bulgaria
| | - Ivayla Dincheva
- Department of Agrobiotechnologies, Agrobioinstitute, Agricultural Academy, Sofia, Bulgaria
| | - Fred Stevens
- Department of Pharmaceutical Sciences and the Linus Pauling Institute, Linus Pauling Science Center, Oregon State University, SW Campus Way, Corvallis, OR, United States of America
| | - Wenbin Wu
- Department of Pharmaceutical Sciences and the Linus Pauling Institute, Linus Pauling Science Center, Oregon State University, SW Campus Way, Corvallis, OR, United States of America
| | - Tess Astatkie
- Faculty of Agriculture, Dalhousie University, Truro, NS, Canada
| | - Tanya Ivanova
- Department of Technology of Fats, Essential Oils, Perfumery and Cosmetics, University of Food Technologies, Plovdiv, Bulgaria
| | - Albena Stoyanova
- Department of Tobacco, Sugar, Vegetable and Essential Oils, Perfumery and Cosmetics, University of Food Technologies, Plovdiv, Bulgaria
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