Foliar application of micronutrients on essential oils of borago, thyme and marigold

In order to compare the uptake, utilization and distribution of iron (Fe) as nano and bulk Fe complex (Fe(III)-EDTA), an experiment was conducted using hydroponically-grown Fe-deficient tobacco (Nicotiana rustica L.) plants. Plants were treated with Fe either through roots (root application, RA) or leaves (foliar application, FA).Leaf chlorophyll concentration and plants biomass responded to the Fe re-supply; this response was quicker for the nano Fe complex than the bulk Fe complex, in particular, in the RA plants. Plants re-supplied with the nano Fe complex had lower Fe content but higher Fe use efficiency than plants re-supplied with the bulk Fe complex.Analysis of different plant fractions at two subsequent weeks revealed that the nano Fe complex had higher mobility than the bulk Fe complex, both in the xylem and the phloem. Comparison of RA and FA revealed that the re-supply of Fe through roots was more efficient in retrieving the whole plant growth than the foliar Fe spray.RA, in contrast to FA plants, profited from an enhanced Fe uptake capacity induced under Fe starvation in the roots. Alternatively, FA was effective in extending the green leaf area duration. Our data suggested that nano Fe complex is advantageous as both leaf spray and a long-term feeding of plant through roots.

Section: Introductionmentioning

confidence: 99%

Nano iron (Fe) complex is an effective source of Fe for tobacco plants grown under low Fe supply

Bastani

Hajiboland

Khatamian

et al. 2018

“…The application of fertilizers and the mineral uptake/accumulation are the two most important factors that increase plant yield and productivity (Almeida et al, 2015). The essential oil production in aromatic plants may be affected positively or negatively by the form, the type and the amount of the fertilizers (Yadegari, 2015). Minerals such as nitrogen (N), phosphorous (P), and potassium (K) may affect the growth and essential oil synthesis in aromatic plants and are used by plants to build many organic compounds such as amino acids, proteins, enzymes and nucleic acids.…”

Section: Introductionmentioning

confidence: 99%

Optimization of potassium fertilization/nutrition for growth, physiological development, essential oil composition and antioxidant activity of Lavandula angustifolia Mill

Chrysargyris

Drouza

Tzortzakis

2017

Lavandula angustifolia (Mill.) is a medicinal plant of great importance with a variety of applications in perfume and pharmaceutical industries or landscaping, but only limited information is available about its response to potassium supplementation. This experiment was conducted in order to determine the effects of potassium (K: ,8-cineole, borneol, camphor, α-terpineol, myrtenal) and mineral accumulation were affected by K treatments. Lavender grown in 300 mg L -1 of K was appropriate for the essential oil uses/production while the 325 mg L -1 of K were more appropriate for lavender cultivation for fresh and dry matter uses.

“…These compounds are common in essential oils of different plants from diverse families including Asteraceae (Leonardi et al, 2013), Lamiaceae (Herraiz-Peñalver et al, 2015), Pinaceae (Sadeghi et al, 2013), Solanaceae (Murungi et al, 2013), etc. Additionally, recent studies have suggested that the addition of micronutrients and the inoculation of aromatic plants with mycorrhiza can enhance the production of different terpenes as well as other secondary metabolites, increasing the yield of biocidal compounds from natural sources (Yadegari, 2015;Jugran et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Antifeedant effects of common terpenes from Mediterranean aromatic plants on Leptinotarsa decemlineata

Elguea‐Culebras

Sánchez‐Vioque²,

Berruga

et al. 2017

Essential oil terpenes are secondary metabolites produced in different biological pathways as pollinator attraction signals, but also as defense mechanisms against insect pests, herbivores, microorganisms, competing plants, etc. In this context, we have evaluated a total of 24 terpenes commonly found in Mediterranean aromatic plants, including 8 monoterpene hydrocarbons, 9 oxygenated monoterpenes, 2 esterified monoterpenes, 3 sesquiterpene hydrocarbons and 2 oxygenated sesquiterpenes in order to determine their antifeedant effects on the Colorado potato beetle (Leptinotarsa decemlineata Say), a major pest of potato crops. Terpene hydrocarbons showed low antifeedant activity, whereas the oxygenated sesquiterpene (-)-α-bisabolol with an inhibition activity of 96.3% was the most active, followed by carvacrol (90.9%), (+)-Terpinen-4-ol (87.1%) and thymol (81.5%). Other terpenes like (1S)-(-)-verbenone (72.9%), (+/-)-camphor (63.4%) and linalyl acetate (60.7%) showed moderate activity. Subsequently, terpenes showing antifeedant activity against this insect were also tested in allelopathic assays to determine potential damage to the crops. Results showed phytotoxic effects for (1S)-(-)-verbenone on Lactuca sativa germination, and for carvacrol on both the seed germination and the leaf and root growth of Lolium perenne. In conclusion, (-)-α-bisabolol is the best option to develop natural antifeedant formulations against L. decemlineata on the basis of its high antifeedant and low phytotoxic activities.