Effects of volatile oils from aromatic shrubs on soil microorganisms

Vokou, Despoina; Margaris, N. S.; Lynch, J. M.

doi:10.1016/0038-0717(84)90060-9

Cited by 55 publications

(41 citation statements)

References 6 publications

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“…From the other hand Vokou et al (2006), found that soil respiration is stimulated by essential oils of aromatic plants rich in carvacrol and/or thymol as the one used in this experiment. Our results evidenced an increase of the specific respiration (qCO2) in TCP treatment, results of previous research (Vokou et al 1984(Vokou et al , 2002showed that soil respiration was activated in the presence of Thymbra capitata and Satureja thymbra essential oils. The increase of soil respiration was found to be a primary rather than secondary effect.…”

Section: Experiments Onesupporting

confidence: 86%

“…The increase of soil respiration was found to be a primary rather than secondary effect. The essential oils from these plants did not kill some soil microorganisms, thereby providing substrate easily decomposable to others (Vokou et al 1984) but directly activated soil bacteria (Vokou et al 2002). It has been already found that, although their volatile oils are generally used in the therapeutics as antimicrobial agents, when applied to soil samples from the site where the aromatic plants grow they did promote soil respiration; it was further shown that this promotion is mainly due to soil bacteria which are able to catabolize them (Vokou & Margaris 1986).…”

Section: Final Remarksmentioning

confidence: 99%

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Effects of different weed control practices on soil quality in Mediterranean crops

Oddo¹

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-Effects of different weed control practices on soil quality in mediterranean crops I Abstract: Effects of different weed control practices on soil quality in mediterranean cropsThis research approaches the question of weed control sustainability, from the point of view of soil quality maintenance and enhancing.A big choice of practices and products for weed control are available nowadays, but the actual definition of "sustainable practice" not always considers soil fertility. Soil processes timescale is wider than the productive, commercial and legislative ones. Also the definition of survey protocols is a process slower than the evolution of weed control methods.The faster reaction in the soil ecosystem after an external pressure is given by the organisms living in it, and the microbial community is finally the most effective agent in nutrient recycling processes.In this investigation, the same soil analysis protocol was applied on soil samples exposed to different weed management and control methods. Using soil quality indexes and bioindicators, soil properties variations after the different weed control treatments were compared. In particular soil carbon pool and how microbial community recycles was surveyed. A standard protocol to both find variations in long-term soil quality and survey the short-term impact of weed control practices on soil biological processes was defined.Weed management practices can interact with the nutrients recycling processes performed by the microorganisms living in the soil. These processes have a central role in maintaining soil fertility, one of the most important resources for agriculture.Three weed management practices were compared: the use of synthetic (oxyfluorfen) or natural (essential oils and aqueous extracts) herbicides and two mechanical methods (tillage and mulching).Soil fertility was monitored measuring soil physical-chemical values and elaborating soil quality indexes and bioindicators.Effects of different weed control practices on soil quality in mediterranean crops II Riassunto: Effetti di diverse tecniche di gestione delle erbe infestanti dei coltivi mediterranei sulla qualità del suolo Questa ricerca si occupa di un ramo della sostenibilità ambientale del controllo delle arvensi infestanti, dal punto di vista del mantenimento e del miglioramento della qualità del suolo. Oggi è disponibile sul mercato una vasta gamma di prodotti e di tecniche, ma la stessa definizione di "pratica sostenibile" non sempre tiene in considerazione la fertilità del suolo.I processi che avvengono nel suolo hanno infatti scale temporali più ampie rispetto a quelli produttivi, commerciali e legislativi. Anche la definizione dei protocolli di indagine è un processo più lento rispetto all'evoluzione commerciale dei metodi di controllo delle infestanti. In seguito ad una pressione esterna, la parte dell'ecosistema suolo che reagisce più velocemente sono gli organismi che in esso vivono, e la comunità microbica è in definitiva l'operatore più efficace nel riciclare i nutrienti del suolo.In...

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Section: Experiments Onesupporting

confidence: 86%

Section: Final Remarksmentioning

confidence: 99%

Effects of different weed control practices on soil quality in Mediterranean crops

Oddo¹

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“…They can inhibit germination, growth and survival of other plants (Aspelund 1968;Langenheim 1994;Tarayre et al 1995;Abrahim et al 2000;Ehlers 2011), growth of micro-organisms (e.g. Vokou et al 1984) and can act as a deterrent against herbivores . The essential oil is sequestered in glandular trichomes on leaves and stems and enters the soil during litter decomposition of thyme leaves.…”

Section: Introductionmentioning

confidence: 99%

An allelopathic plant facilitates species richness in the Mediterranean garrigue

2013

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Summary1. Positive plant-plant interactions are known to increase species richness in stressful and poor habitats that are often species poor, but the role of facilitative interactions in species-rich communities is less well understood. It has been proposed that allelopathic plants may create non-transitive species interactions, which increase species coexistence, and that such indirect facilitation may be important in species-rich communities. 2. We examined species richness in 12 different plant communities all dominated by the aromatic Thymus vulgaris that produces monoterpenes known to inhibit germination and growth of other plants. 3. We found consistently, and across communities, higher species richness in microsites with thyme than without. Species richness in microsites with, respectively without, two other perennial plants did not differ, suggesting that increased species richness in thyme microsites is due to the presence of thyme. We found a more similar species composition among thyme microsites and positive estimates of thyme on landscape richness enhancement, indicating that thyme also affect richness at the community level. However, across communities, we did not find species consistently confined to thyme microsites, albeit within communities some plants were exclusive to thyme. 4. Abundance of a dominant grass was reduced in microsites where thyme produces the monoterpene carvacrol, suggesting that one mechanism by which thyme facilitates species richness was by the repression of a superior competitor that could allow other species to persist. However, this does not explain higher species richness in microsites of thyme producing other monoterpenes. We discuss how chemical variation in thyme and adaptation of associated species to local monoterpenes may affect richness and community diversity. 5. Synthesis. Allelopathic plants are generally believed to negatively impact upon the performance of associated species. However, allelopathic plants may be important determinants of species richness at the community level by creating microenvironments where species-specific interactions differ. Our finding shows that thyme increases species richness both locally and at the community level by creating a mosaic of thyme-modified and unmodified microsites differing in richness and composition. We suggest that this may also apply to other aromatic plants common in Mediterranean vegetation.

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“…The effect of volatile oils on microorganisms has been tested with a disk diffusion technique and was measured by the clear zone of microorganisms (Vokou and Margaris 1984;Thangadurai and Anitha, 2002).…”

Section: The Effect Of Monoterpenoids On P Pallidiummentioning

confidence: 99%

The effect of monoterpenoids on growth of a cellular slime mold,Polysphondylium pallidum

Hwang

Kim

2004

J. Plant Biol.

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A cellular slime mold, Polysphondylium pallidum was isolated from the forest floor of Mountain Muhak. The effect of 11 selected monoterpenoids on the growth of P. pallidum was studied. We tested four different concentrations (1, 0.1, 0.01, and 0.001 ~g/l~l) for each compound by using a disk volatilization technique. Each compound was treated after germination of spores of P. pallidum. The growth of P. pallidum was inhibited by the treatment of the monoterpenoids at all concentrations tested. The microscopic analysis further supported these results. Most of the inhibitory effects of the compounds were represented by changes in the shapes of the fruiting bodies, such as very short sorophores, smaller sized sori and sori without spores. Especially, the monotepenoids changed the shape of whorls of side branches. These results suggested that selected monoterpenoids inhibit the growth of P. pallidum.

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Effects of volatile oils from aromatic shrubs on soil microorganisms

Cited by 55 publications

References 6 publications

Effects of different weed control practices on soil quality in Mediterranean crops

Effects of different weed control practices on soil quality in Mediterranean crops

An allelopathic plant facilitates species richness in the Mediterranean garrigue

The effect of monoterpenoids on growth of a cellular slime mold,Polysphondylium pallidum

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