Seasonal variation in the volatile leaf oils of twoEucalyptus species

Simmons, Dianne; Parsons, R. F.

doi:10.1016/0305-1978(87)90021-4

Cited by 27 publications

(15 citation statements)

References 19 publications

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“…In fact, the entire oil constituent profile was very similar from one rotation to the next. Season has been suggested as exerting small moderating effects on oil composition in the Myrtaceae (Boland et al, 1982;Simmons and Parsons, 1987;Doran and Bell, 1994), but the similar constituent profiles observed here suggest that the growing seasons during each rotation were not particularly different, despite the higher total rainfall in 2005. As with the sapling versus subsequent coppice comparison, a highly significant relationship for cineole percentage was also observed between the two coppice harvests, explaining 90% of the variation in cineole proportion of total oil (Fig.…”

Section: Coppice Consistencysupporting

confidence: 47%

“…Leaf maturation has also been shown to exert demonstrable effects on the relative abundance of Eucalyptus leaf oil constituents, even when members of a species are sampled under identical environmental conditions (Boland et al, 1982;Simmons and Parsons, 1987;Doran and Bell, 1994). The results presented here support this conclusion, with the juvenileintermediate form of fully expanded coppice leaves exhibiting a significantly lower percentage of cineole in their oil than the adult leaf form of saplings (Table 2).…”

Section: Sapling and Coppice Traitsmentioning

confidence: 96%

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Examination of the consistency of plant traits driving oil yield and quality in short-rotation coppice cultivation of Eucalyptus polybractea

Goodger

Connelly

Woodrow

2007

Forest Ecology and Management

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Section: Coppice Consistencysupporting

confidence: 47%

Section: Sapling and Coppice Traitsmentioning

confidence: 96%

Examination of the consistency of plant traits driving oil yield and quality in short-rotation coppice cultivation of Eucalyptus polybractea

Goodger

Connelly

Woodrow

2007

Forest Ecology and Management

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“…Rapid induced resistance that occurs in birches is absent in mature leaves (Neuvonen et al 1988;Neuvonen and Haukioja 1991). In this study we restricted our sampling for terpenes and FPCs to new fully expanded leaves to minimise unwanted variation associated with leaf age as terpene concentration and composition changes rapidly during leaf expansion (Maarse and Kepner 1970;Simmons and Parsons 1987). It is possible that an induced response occurred in expanding tissues and was not detected in our study by direct measurement.…”

Section: Discussionmentioning

confidence: 56%

Methyl jasmonate does not induce changes in Eucalyptus grandis leaves that alter the effect of constitutive defences on larvae of a specialist herbivore

Henery

Wallis

Stone³

et al. 2008

Oecologia

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The up-regulation of secondary metabolic pathways following herbivore attack and the subsequent reduction in herbivore performance have been identified in numerous woody plant species. Eucalypts constitutively express many secondary metabolites in the leaves, including terpenes and formylated phloroglucinol compounds (FPCs). We used clonal ramets from six clones of Eucalyptus grandis and two clones of E. grandis x camaldulensis to determine if methyl jasmonate (MeJA) treatment could induce changes in the foliar concentrations of either of these groups of compounds. We also used bioassays to determine if any changes in the performance of larvae of Paropsis atomaria, a chrysomelid leaf beetle, could be detected in treated ramets versus the untreated controls, thus indicating whether MeJA induced the up-regulation of defences other than terpenes or FPCs. We found no significant effects of MeJA treatment on either the foliar concentrations of terpenes and FPCs or on herbivore performance. We did, however, detect dramatic differences in larval performance between Eucalyptus clones, thereby demonstrating large variations in the levels of constitutive defence. Larval feeding on clones resistant to P. atomaria resulted in high first instar mortality and disruption of normal gregarious feeding behaviour in surviving larvae. Histological examination of larvae feeding on a resistant clone revealed damage to the midgut consistent with the action of a toxin. These findings concur with mounting evidence that most evergreen perennial plants lack foliar-induced defences and suggest that constitutively expressed secondary metabolites other than those commonly examined in studies of interactions between insect herbivores and Eucalyptus may be important in plant defence.

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“…Individual trees were readily distinguished in spite of the observed variation and with appropriate sampling, chemosystematic studies should hot be affected 15 . The trees sampled included several chemical forms, and individuals varied characteristically and differently over the sampling period.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variation in the Essential oil and 1,8-cineole Content of FourEucalyptusSpecies (E. intertexta, E. platypus, E. leucoxylonandE. camaldulensis)

Sefidkon

Asareh

Abravesh

et al. 2010

Journal of Essential Oil Bearing Plants

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The seeds of four Eucalyptus species (Origin: Australia) named, Eucalyptus intertexta var. intertexta R.T. Baker, Eucalyptus platypus var. heterophylla Blakely, Eucalyptus leucoxylon var. rosea Miq. and Eucalyptus camaldulensis var. obtuse Blakely were cultivated in the years 1993-1994 in Kashan in Isfahan province (Central regions of Iran). These species have good adaptability with the climatic condition of this area (dry and warm weather). The leaves of these species were collected in the middle of four seasons (spring, summer, autumn and winter), for finding the best harvesting time for obtaining the highest oil yield and 1,8-cineole content. After drying the plant materials in shade, their essential oils were obtained by hydro-distillation. The oils were analyzed by capillary gas chromatography, using flame ionization and mass spectrometric detection. Analysis of variance showed harvesting time had significant effect on the oil yields and 1,8-cineole content of these Eucalyptus species. Nineteen components were identified in the oils of Eucalyptus intertexta with 1,8-cineole (67.2-83.1%) and globulol (1.9-8.9 %) as main constituents. The highest percentage of essential oil and 1,8-cineole were found in summer and winter, respectively. Twenty-three compounds were characterized in the oil of Eucalyptus platypus with 1,8-cineole (27.1-56.4 %) and αpinene (7.3-31.7 %) as main constituents. The highest percentage of essential oil and 1,8-cineole was found in autumn. Fourteen compounds were identified in the oil of Eucalyptus leucoxylon with 1,8cineole (41.7-85.5 %) as main constituent. The highest percentage of essential oil and 1,8-cineole was found in spring. Twenty-nine components were identified in the oils of Eucalyptus camaldulensis with 1,8-cineole (26.1-51.6 %) and α-pinene (7.6-13.2 %) as main constituents. The highest percentage of essential oil and 1,8-cineole was found in summer and autumn, respevtively. The results showed, with considering the highest oil yield and 1,8-cineole content together, the best harvesting time for E. intertexta and E. platypus was autumn, E. leucoxylon was spring and E. camaldulensis was summer.

show abstract

Seasonal variation in the volatile leaf oils of twoEucalyptus species

Cited by 27 publications

References 19 publications

Examination of the consistency of plant traits driving oil yield and quality in short-rotation coppice cultivation of Eucalyptus polybractea

Examination of the consistency of plant traits driving oil yield and quality in short-rotation coppice cultivation of Eucalyptus polybractea

Methyl jasmonate does not induce changes in Eucalyptus grandis leaves that alter the effect of constitutive defences on larvae of a specialist herbivore

Seasonal Variation in the Essential oil and 1,8-cineole Content of FourEucalyptusSpecies (E. intertexta, E. platypus, E. leucoxylonandE. camaldulensis)

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