Effects of variation in Eucalyptus essential oil yield on insect growth and grazing damage

Morrow, P. A.; Fox, Laurel R.

doi:10.1007/bf00346462

Cited by 128 publications

(63 citation statements)

References 29 publications

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“…However, eucalypt secondary compounds are thought to have little effect on paropsine feeding (Fox & Macauley, 1977;Morrow & Fox, 1980). That the fecundity and longevity of adult beetles, and larval survival, development time and subsequent pupal weight, was similar for adult and juvenile foliage further demonstrates that neither foliage type is nutritionally superior.…”

Section: Discussionmentioning

confidence: 99%

Intra‐plant host selection, oviposition preference and larval survival of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae: Paropsini) between foliage types of a heterophyllous host

Nahrung¹,

Allen²

2003

Agri and Forest Entomology

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1 Paropsine chrysomelid beetles defoliate commercial eucalypt plantations in Australia. Adults and larvae feed on the same host, with the larval food source determined by the oviposition choice of females. Most eucalypt species are heterophyllous, with their foliage undergoing distinct morphological and chemical changes between adult and juvenile growth. 2 The intra-plant foliage feeding and oviposition preference adults and the larval development of Chrysophtharta agricola were examined using adult and juvenile foliage of a heterophyllous plantation species, Eucalyptus nitens. The foliage types differ in chemistry, toughness, waxiness and timing of production. 3 In the field, feeding damage caused by adult beetles was 15% more frequent on adult foliage than on juvenile foliage; however, egg batches were three times more common on juvenile than on adult foliage. 4 Oviposition preference for juvenile foliage over adult foliage was confirmed in choice trials in the laboratory, with adult fecundity and longevity not significantly different between foliage types. 5 Larval survival, development time and subsequent pupal weight were also unaffected by foliage type, suggesting that neither foliage type is nutritionally superior for adults or for larvae. However, adult foliage was significantly thicker than juvenile foliage and this may prove a physical constraint to larval establishment. Biotic and abiotic factors (including interactions with natural enemies, competition, microclimate and mate location) that may affect patterns of host plant utilization are discussed.

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Section: Discussionmentioning

confidence: 99%

Intra‐plant host selection, oviposition preference and larval survival of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae: Paropsini) between foliage types of a heterophyllous host

Nahrung¹,

Allen²

2003

Agri and Forest Entomology

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“…The role of cineole 1 is somewhat unclear, although it is believed to be involved in a number of functions including defense against herbivores (11,12) and pathogens (13), attracting pollinators and fruit-dispersing animals (14), and/or as an allelopathic agent (15,16). The Australian eucalypt population collectively produces and releases an estimated 500,000 tons of cineole 1 into the environment annually (17).…”

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confidence: 99%

Cytochrome P450cin (CYP176A), Isolation, Expression, and Characterization

Hawkes¹,

Adams²,

Burlingame³

et al. 2002

Journal of Biological Chemistry

112

131

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Cytochromes P450 are members of a superfamily of hemoproteins involved in the oxidative metabolism of various physiologic and xenobiotic compounds in eukaryotes and prokaryotes. Studies on bacterial P450s, particularly those involved in monoterpene oxidation, have provided an integral contribution to our understanding of these proteins, away from the problems encountered with eukaryotic forms. We report here a novel cytochrome P450 (P450 cin , CYP176A1) purified from a strain of Citrobacter braakii that is capable of using cineole 1 as its sole source of carbon and energy. This enzyme has been purified to homogeneity and the amino acid sequences of three tryptic peptides determined. By using this information, a PCR-based cloning strategy was developed that allowed the isolation of a 4-kb DNA fragment containing the cytochrome P450 cin gene (cinA). Sequencing revealed three open reading frames that were identified on the basis of sequence homology as a cytochrome P450, an NADPH-dependent flavodoxin/ferrodoxin reductase, and a flavodoxin. This arrangement suggests that P450 cin may be the first isolated P450 to use a flavodoxin as its natural redox partner. Sequencing also identified the unprecedented substitution of a highly conserved, catalytically important active site threonine with an asparagine residue. The P450 gene was subcloned and heterologously expressed in Escherichia coli at ϳ2000 nmol/liter of original culture, and purification was achieved by standard protocols. Postulating the native E. coli flavodoxin/flavodoxin reductase system might mimic the natural redox partners of P450 cin , it was expressed in E. coli in the presence of cineole 1. A product was formed in vivo that was tentatively identified by gas chromatography-mass spectrometry as 2-hydroxycineole 2. Examination of P450 cin by UV-visible spectroscopy revealed typical spectra characteristic of P450s, a high affinity for cineole 1 (K D ‫؍‬ 0.7 M), and a large spin state change of the heme iron associated with binding of cineole 1. These facts support the hypothesis that cineole 1 is the natural substrate for this enzyme and that P450 cin catalyzes the initial monooxygenation of cineole 1 biodegradation. This constitutes the first characterization of an enzyme involved in this pathway.The cytochrome P450s (P450s) 1 are a superfamily of oxidative hemoproteins (1, 2) that carry out an enormous variety of oxidative transformations. These range from simple alkene epoxidation and heteroatom oxidation all the way through oxygen insertion into unactivated C-H bonds and C-C bond cleavage (3). P450s are broadly categorized as either soluble, e.g. most bacterial P450s, or as membrane bound/microsomal monooxygenases, e.g. most eukaryotic P450s. All P450s, however, contain a prosthetic heme group that is ligated to the protein backbone by a cysteinyl sulfur coordinated to the heme iron. It is this heme-thiolate moiety that is responsible for much of the chemistry carried out by these enzymes. The typical reaction catalyzed by a P450 is given by Reaction...

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“…2), leaves ofjarrah do not conform to the isobilateral pattern of other eucalypts described by McLuckie and McKee (1954). Their content of secondary compounds, essential oils and tannins, (Carr and Carr 1970;Hillis 1967), are presumed to be toxic to herbivores (Morrow and Fox 1980;Feeny 1968). While the ingestion of oils is relatively easy for the larva to avoid (Mazanec 1983), that of tannins is not, since they occur in the epidermal and palisade cells which are both eaten.…”

Section: Discussionmentioning

confidence: 99%

RESISTANCE OF EUCALYPTUS MARGINATA TO PERTHIDA GLYPHOPA (LEPIDOPTERA: INCURVARIIDAE)

Mazanec

1985

Australian Journal of Entomology

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Diirvon of E n r o m o k~g~. CSIRO. Florea/ PurA. P 0 . Wemhler. R' A 6014 AbstractAnatomy of leavesofjarrah. Eucu/yp/usmargina/a Donn ex Smith, and their response to the presence of the jarrah leafminer Pcr//iidu g/yppliopu Common. are described. Depending on the reaction to its eggs and larvae. 4 types o f trees were recognised: (a) susceptible to oviposition. egg development and larval feeding; (b) resistant to egg development; (c) resistant to larval feeding; (d) resistant to oviposition and egg development. Leaves oftypes a. band c had identical anatomy, whereas those ofthe only known tree of type d had a ditlerent structure of the mesophyll and lacked tannin in the palisade tissue.

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Effects of variation in Eucalyptus essential oil yield on insect growth and grazing damage

Cited by 128 publications

References 29 publications

Intra‐plant host selection, oviposition preference and larval survival of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae: Paropsini) between foliage types of a heterophyllous host

Intra‐plant host selection, oviposition preference and larval survival of Chrysophtharta agricola (Chapuis) (Coleoptera: Chrysomelidae: Paropsini) between foliage types of a heterophyllous host

Cytochrome P450cin (CYP176A), Isolation, Expression, and Characterization

RESISTANCE OF EUCALYPTUS MARGINATA TO PERTHIDA GLYPHOPA (LEPIDOPTERA: INCURVARIIDAE)

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