Abstract
ABSTRACT Homalomena aromatica is an economically important essential oil‐producing plant. The rhizome is a commercial source of essential oil useful for high‐grade perfumery and therapeutic applications. It is mainly collected from wild sources. The present study aims to investigate the histochemical localization of oil‐secreting idioblasts and the variability in oil composition in commercial samples. The histochemical study revealed that essential oil is synthesised in oil cells and oil cavities distributed in the rhizome tissues. The larger oil cavities (521 ± 59.4 μm in size) synthesise essential oil and resin, whereas the smaller oil cells (67.2 ± 7.4 μm in size) synthesise only essential oil. The spatial distribution demonstrates that the oil cavities were densely present in the inner ground tissue region, whereas the oil cells were abundant in the cortex ( p < 0.05 ). The different grades of commercial rhizome samples, that is, thickness up to 10 mm (narrow rhizomes, NR), 10 to 20 mm (medium‐sized rhizomes, MR), and 20 to 30 mm (thick rhizomes, TR) showed variation in essential oil yield and composition, fibre content, and distribution of fibre cells. The study demonstrated that the oil yield is negatively correlated with rhizome thickness, fibre content, and density of fibre cells in tissue. The oil of H. aromatica is dominated by linalool (44.18%–61.4%) followed by terpinene‐4‐ol (6.45%–13.16%) in the rhizomes of different thicknesses. These major constituents also negatively correlate with rhizome thickness and significantly decrease in the TR samples. The study concludes that the NR grade rhizomes are better for higher oil yield and linalool and terpinene‐4‐ol content than the TR grade of H. aromatica rhizomes.
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Claims 11
Claim · model-written summary
Essential oil is synthesised in oil cells and oil cavities distributed in the rhizome tissues of Homalomena aromatica.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Organ / stage
- rhizome tissuese1
- Outcome
- essential oil is synthesisede1
Verbatim
e0“Homalomena aromatica is an economically important”
e1“The histochemical study revealed that essential oil is synthesised in oil cells and oil cavities distributed in the rhizome tissues”
Claim · model-written summary
Larger oil cavities (521 ± 59.4 μm) of the rhizome synthesise essential oil and resin.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Organ / stage
- larger oil cavitiese2
- Outcome
- synthesise essential oil and resine2
- Value
- 521 ± 59.4 μme2
Verbatim
e0“Homalomena aromatica is an economically important”
e2“The larger oil cavities (521 ± 59.4 μm in size) synthesise essential oil and resin”
Claim · model-written summary
Smaller oil cells (67.2 ± 7.4 μm) of the rhizome synthesise only essential oil.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Organ / stage
- smaller oil cellse3
- Outcome
- synthesise only essential oile3
- Value
- 67.2 ± 7.4 μme3
Verbatim
e0“Homalomena aromatica is an economically important”
e3“the smaller oil cells (67.2 ± 7.4 μm in size) synthesise only essential oil”
Claim · model-written summary
Oil cavities are densely present in the inner ground tissue region of the rhizome.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Organ / stage
- oil cavitiese4
- Outcome
- densely presente4
- Qualifier
- inner ground tissue regione4
Verbatim
e0“Homalomena aromatica is an economically important”
e4“the oil cavities were densely present in the inner ground tissue region, whereas the oil cells were abundant in the cortex ( p < 0.05 )”
Claim · model-written summary
Oil cells are abundant in the cortex of the rhizome.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Organ / stage
- oil cellse4
- Outcome
- abundante4
- Qualifier
- in the cortexe4
Verbatim
e0“Homalomena aromatica is an economically important”
e4“the oil cavities were densely present in the inner ground tissue region, whereas the oil cells were abundant in the cortex ( p < 0.05 )”
Claim · model-written summary
Oil yield is negatively correlated with rhizome thickness in Homalomena aromatica.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Treatment
- rhizome thicknesse5
- Outcome
- oil yielde5
- Direction
- negatively correlatede5
Verbatim
e0“Homalomena aromatica is an economically important”
e5“the oil yield is negatively correlated with rhizome thickness, fibre content, and density of fibre cells in tissue”
Claim · model-written summary
The oil of Homalomena aromatica is dominated by linalool at 44.18%–61.4%.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Compound
- linaloole1
- Outcome
- dominated by linaloole1
- Value
- 44.18%–61.4%e1
Verbatim
e0“Homalomena aromatica is an economically important”
e1“The oil of H. aromatica is dominated by linalool (44.18%–61.4%)”
Claim · model-written summary
Terpinene‐4‐ol follows linalool as a major oil constituent of Homalomena aromatica at 6.45%–13.16%.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Compound
- terpinene‐4‐ole1
- Outcome
- followed by terpinene‐4‐ole1
- Value
- 6.45%–13.16%e1
Verbatim
e0“Homalomena aromatica is an economically important”
e1“followed by terpinene‐4‐ol (6.45%–13.16%)”
Claim · model-written summary
Major oil constituents of Homalomena aromatica negatively correlate with rhizome thickness.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Treatment
- rhizome thicknesse7
- Outcome
- major constituentse7
- Direction
- negatively correlatee7
Verbatim
e0“Homalomena aromatica is an economically important”
e7“These major constituents also negatively correlate with rhizome thickness and significantly decrease in the TR samples”
Claim · model-written summary
Major oil constituents of Homalomena aromatica significantly decrease in thick rhizome (TR) samples.
- Taxon
- Homalomena aromaticaHomalomena aromaticae0
- Treatment
- TR samplese7
- Outcome
- major constituentse7
- Direction
- significantly decreasee7
Verbatim
e0“Homalomena aromatica is an economically important”
e7“These major constituents also negatively correlate with rhizome thickness and significantly decrease in the TR samples”
Claim · model-written summary
NR grade rhizomes of Homalomena aromatica are better than TR grade rhizomes for higher oil yield.
- Taxon
- H. aromaticaHomalomena aromaticae1
- Outcome
- NR grade rhizomese0
- Comparator
- TR gradee1
Verbatim
e0“the NR grade rhizomes are better for higher oil yield”
e1“than the TR grade of H. aromatica rhizomes”