The hydrodistilled oil of Cryptocarya massoy bark was analysed by means of GC and GC-MS, highlighting the presence of unusual C10 massoia lactone (56.2%), C12 massoia lactone (16.5%), benzyl benzoate (12.7%), C8 massoia lactone (3.4%), δ-decalactone, (1.5%) and benzyl salicylate (1.8%) as key constituents. The phytotoxic activities of the oil, of three enriched fractions (lactone-rich, ester-rich, sesquiterpene-rich) and four constituents (δ-decalactone, δ-dodecalactone, benzyl salicylate, benzyl benzoate) were screened on Lycopersicon esculentum and Cucumis sativus seeds and seedlings. At 1000 μl/L the essential oil and the massoia lactone-rich fraction caused a complete inhibition of germination in both assays and when applied on tomato plantlets induced an 85% and 100% dieback respectively. Performances exceeded well-known phytotoxic essential oils Syzygium aromaticum and Cymbopogon citratus, already used in commercial products for weed and pest management. The same substances were also evaluated against 4 phytopathogenic bacteria and 10 phytopathogenic fungi, providing EC50 in the 100-500 μl/L range for essential oil and in the 10-50 μl/L range for δ-dodecalactone and massoia lactone-rich fraction. The phytotoxic behavior is related mainly to massoia lactones and benzyl esters, while a greater amount of δ-dodecalactone may infer a good activity against some phytopathogenic fungi. Further investigations of these secondary metabolites are warranted to evaluate their use as natural herbicides.
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|Titolo:||Phytotoxic Effects and Phytochemical Fingerprinting of Hydrodistilled Oil, Enriched Fractions, and Isolated Compounds Obtained from Cryptocarya massoy (Oken) Kosterm. Bark|
|Autori interni:||GUERRINI, Alessandra|
|Data di pubblicazione:||2016|
|Rivista:||CHEMISTRY & BIODIVERSITY|
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