Ontogenèse des canaux sécréteurs d'origine primaire dans le bourgeon de Pin maritime

Charon, Jacqueline; Launay, J.C.; Vindt-Balguerie, Emmeline

doi:10.1139/b86-390

Cited by 7 publications

(2 citation statements)

References 7 publications

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“…The secretory cells bordering the resin ducts of pine needles synthesize large quantities of monoterpenes ( Wooding and Northcote, 1965) ( Figure 5d). The non‐green plastids of these secretory cells have been postulated as the primary source of these isoprenoids ( Charon et al ., 1986 ; Wooding and Northcote, 1965). Antibodies to isoprenoid enzymes were used to evaluate the immunoreactivity of these plastids in pine needles.…”

Section: Resultsmentioning

confidence: 99%

Molecular cloning of geranyl diphosphate synthase and compartmentation of monoterpene synthesis in plant cells

Bouvier¹,

Suire²,

et al. 2000

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SummaryThe nature of isoprenoids synthesized in plants is primarily determined by the speci®city of prenyltransferases. Several of these enzymes have been characterized at the molecular level. The compartmentation and molecular regulation of geranyl diphosphate (GPP), the carbon skeleton that is the backbone of myriad monoterpene constituents involved in plant defence, allelopathic interactions and pollination, is poorly understood. We describe here the cloning and functional expression of a GPP synthase (GPPS) from Arabidopsis thaliana. Immunohistological analyses of diverse non-secretory and secretory plant tissues reveal that GPPS and its congeners, monoterpene synthase, deoxy-xylulose phosphate synthase and geranylgeranyl diphosphate synthase, are equally compartmentalized and distributed in non-green plastids as well in chloroplasts of photosynthetic cells. This argues that monoterpene synthesis is not solely restricted to specialized secretory structures but can also occur in photosynthetic parenchyma. These data provide new information as to how monoterpene biosynthesis is compartmentalized and induced de novo in response to biotic and abiotic stress in diverse plants.

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Section: Resultsmentioning

confidence: 99%

Molecular cloning of geranyl diphosphate synthase and compartmentation of monoterpene synthesis in plant cells

Bouvier¹,

Suire²,

et al. 2000

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“…The occurrence of monoterpene biosynthesis in other species is also associated with the metabolic activity of glandular trichomes or other specialized secretory structures, such as secretory cavities and resin ducts, in which monoterpenes are synthesized and sequestered. Such structures commonly differentiate in young, expanding tissue (Werker and Fahn, 1981;Charon et al, 1986;Russin et al, 1988), which may account for the fact that monoterpene biosynthesis is often highest in immature tissue.…”

Section: Monoterpene Biosynthesis Is Restricted To a Brief Period Earmentioning

confidence: 99%

Regulation of Monoterpene Accumulation in Leaves of Peppermint

2000

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Plants synthesize numerous classes of natural products that accumulate during development and are thought to function as constitutive defenses against herbivores and pathogens. However, little information is available about how the levels of such defenses are regulated. We measured the accumulation of monoterpenes, a model group of constitutive defenses, in peppermint (Mentha ؋ piperita L.) leaves and investigated several physiological processes that could regulate their accumulation: the rate of biosynthesis, the rate of metabolic loss, and the rate of volatilization. Monoterpene accumulation was found to be restricted to leaves of 12 to 20 d of age, the period of maximal leaf expansion. The rate of monoterpene biosynthesis determined by 14 CO 2 incorporation was closely correlated with monoterpene accumulation, as determined by gas chromatographic analysis, and appeared to be the principal factor controlling the monoterpene level of peppermint leaves. No significant catabolic losses of monoterpenes were detected throughout leaf development, and monoterpene volatilization was found to occur at a very low rate, which, on a monthly basis, represented less than 1% of the total pool of stored monoterpenes. The composition of volatilized monoterpenes differed significantly from that of the total plant monoterpene pool, suggesting that these volatilized products may arise from a separate secretory system. With the demonstration that the rate of biosynthesis is the chief process that determines monoterpene accumulation in peppermint, efforts to improve production in this species can now focus on the genes, enzymes, and cell differentiation processes that regulate monoterpene biosynthesis.

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Seasonal Variations in Energy Sources and Biosynthesis of Terpenes in Maritime Pine

Bernard-Dagan¹

1988

Mechanisms of Woody Plant Defenses Against Insects

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Ontogenèse des canaux sécréteurs d'origine primaire dans le bourgeon de Pin maritime

Cited by 7 publications

References 7 publications

Molecular cloning of geranyl diphosphate synthase and compartmentation of monoterpene synthesis in plant cells

Molecular cloning of geranyl diphosphate synthase and compartmentation of monoterpene synthesis in plant cells

Regulation of Monoterpene Accumulation in Leaves of Peppermint

Seasonal Variations in Energy Sources and Biosynthesis of Terpenes in Maritime Pine

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