Variation in Essential Oil Gland Density, Yield and Composition of Aerial Parts of Eucalyptus tereticornis Sm. and Eucalyptus camaldulensis Dehnh. Issue 5 (3rd September 2021)

• Record Type: Journal Article
• Authors: Bisht, S.S.; Kumar, Deepak; Chandra, Girish
• Is Part Of: Journal of essential oil-bearing plants. Volume 24:Issue 5(2021)
• Page Start: 998
• Page End: 1009
• Publication Date: 2021-09-03
• Subjects: Eucalyptus tereticornis -- Eucalyptus camaldulensis -- 1, 8-Cineole -- γ-Terpinene -- Chemotypes; Essences and essential oils -- Periodicals; Aromatic plants -- Biotechnology -- Periodicals; Oilseed plants -- Biotechnology -- Periodicals; Aromatic plants -- Periodicals; Oilseed plants -- Periodicals; 661.80605
• DOI: 10.1080/0972060X.2021.2005693
• Languages: English
• ISSNs: 0972-060X

Abstract

Abstract: Essential oils (EOs) isolated from aerial parts (leaves, buds and twigs) of Eucalyptus tereticornis Sm. and Eucalyptus camaldulensis Dehnh were analysed for yield, specific gravity (SG), refractive index (RI) and chemical composition. Chemical composition analysis of the EOs was carried out by GC/MS technique. The transverse section (TS) of the leaf was subjected to oil glands measurement by Stereoscopic Zoom Microscope. EOs yield from aerial parts of E. tereticornis varies from 1.0-2.0 % (10-20 g kg −1 leaves biomass), 0.7-1.5 % (7-15 g kg −1 buds biomass) and 0.3-0.5 % (3-5 g kg −1 twigs biomass), while in E. camaldulensis 0.8-1.4 % (8-14 g kg −1 leaves biomass), 1.0-1.4 % (10-14 g kg −1 buds biomass) and 0.4-0.7 % (4-7g kg −1 twigs biomass). RI and SG values for EOs from E. tereticornis were observed in the ranges of 1.442-1.479 and 0.883-0.913 respectively. Similarly, RI and SG values for EOs from E. camaldulensis were observed in the ranges of 1.44-1.462 and 0.889-0.993 respectively. Chemical composition analysis confirms that E. tereticornis oil was a cineole type (1, 8-cineole: 21.31-29.15 %) whereas E. camaldulensis terpinene type (γ-terpinene: 22.33-26.91 %). Average oil gland density in leaf of E. tereticornis and E. camaldulensis was observed as 2.7×10 7 n/m 2 and 2.5×10 7 n/m 2 respectively. Cluster analysis differentiates both the eucalyptus species in terms of EO composition. In addition, four and five principal components can be extracted for E. tereticornis and E. camaldulensis respectively and which explains 96.26 % and 97.87 % of the accumulated variation of the data analysed.