Biosynthesis of precocenes-I and -II, anti-juvenile hormones

Vyas, A. V.; Mulchandani, N. B.

doi:10.1016/s0031-9422(00)83925-4

Cited by 11 publications

(5 citation statements)

References 3 publications

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“…The knowledge of the biosynthesis of HP1, HP2 and HP3 is not available. Nevertheless, an experiment carried out with Ageratum conyzoides (Asteraceae), demonstrated that in the benzopyrans precocene I and II, structurally similar to the above mentioned benzopyrans, the aromatic ring arises from the polyketide route and condenses with dimethyallyl pyrophosphate arising from the mevalonic acid; the subsequent hydroxylation followed by methylation of the aromatic ring yielded the precocenes (Vyas and Mulchandani 1980). Considering that this is an usual route for benzopyrans we could infer that the benzopyrans in H. polyanthemum are formed by a similar pathway, with HP1 being biosynthesized by the methylation of HP2 and/or HP3 by the action of methyl-transferases.…”

Section: Resultsmentioning

confidence: 99%

Benzopyrans in Hypericum polyanthemum Klotzsch ex Reichardt cultured in vitro

et al. 2007

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Hypericum polyanthemum Klotzsch ex Reichardt, an endemic species of Southern Brazil, was micropropagated on MS medium supplemented with 1.78 lM BAP. Shoot proliferation and rooting was achieved on hormone-free medium and plantlets survived acclimatization. The bioactive compounds: 6-isobutyryl-5,7-dimethoxy-2,2-dimethylbenzopyran (HP1), 7-hydroxy-6-isobutyryl-5-methoxy-2,2-dimethyl-benzopyran (HP2) and 5-hydroxy-6-isobutyryl-7-methoxy-2,2-dimethyl-benzopyran (HP3) were quantified in the leaves, stems and roots of propagated and acclimatized plantlets and compared with the field-grown plants. The HPLC analysis revealed that the three benzopyrans are accumulated in the aerial parts and the concentration varied with the age of the plant whereas the roots were capable of accumulating only HP3. Greatest yield of HP1 (7.12 mg/g DW) was quantified in the leaves of the acclimatized plantlets, whereas the flowers of the plants from natural habitat displayed higher amounts of HP2 (11.04 mg/g DW) and HP3 (13.99 mg/g DW).

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Section: Resultsmentioning

confidence: 99%

Benzopyrans in Hypericum polyanthemum Klotzsch ex Reichardt cultured in vitro

et al. 2007

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“…This is probably due to the insecticidal properties or bioactivity of the organic ingredients that were integrated into the liquid fertilizer mixture compositions. Many researchers have reported the insecticidal potentials of Allium sativum, Capsicum annuum, Ageratum conyzoides, Aloe vera and wood ash [39,40,41,42]. The molecular mechanism of toxicity and interaction of lectins found in Allium sativum with mid gut receptor proteins of insects has been described in many reports.…”

Section: Discussionmentioning

confidence: 99%

“…Ageratum conyzoides has long been reported to possess bioactivity that may have an agricultural use [42]. The major components of the oil from Ageratum conyzoides, known as precocenes, is reported to have an antĳuvenile hormonal activity while a methanolic extract from the plant's fresh leaves (250 and 500 ppm) also produced a deficiency of juvenile hormone of a sorghum pest C. partellus [42]. In addition, it has been discovered that Alion A (hydroxy anthrone glycoside) is a principal constituent of A. vera [24], which has been attested to have numerous biological activities including an insecticidal activity [43].…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of Fortified Liquid Organic Manure and Inorganic Fertilizer on the Growth, Physiological and Pesticidal Response of African Nightshade (Solanum scabrum)

Tellen

Mbiseh

2020

JAERI

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Aims: To assess the effectiveness of fortified liquid organic manure, zero fertilizer applications and urea on the growth, physiological and pesticidal response of Solanum scabrum. Study Design: Complete randomized block experimental design. Place and Duration of Study: The green house facility and agricultural research farm at the Pan African Institute for Development – West Africa (PAID-WA), Buea, Cameroon, from August to November 2017. Methodology: Four experimental units with 4 treatments including: two fortified liquid organic manure (T1 and T2,) control (T3) and urea (T4), were established using 96 planting pots. The quantity and application rates for the liquid manure and urea were 4000 L/ha, once and twice a week, and 200 kg/ha, respectively. Leaf colour, leaf size, number of leaves per plant, plant height, stem collar diameter and growth rate were measured. Two plots with three soil beds each, was also established to record pesticide treatment response by counting the number of leaves eaten by insects Results: T2 had darker green leaves, tallest plants (27.57±11.87 cm), highest number of leaves (27.65±25.46 units), largest leaf size (38.56±21.96 cm2), biggest stem collar diameter (1.54±0.41 cm) and highest growth rates (2.54±1.02, 5.18±3.40, and 0.11±0.03 cm/week for height, number of leaves and stem collar diameter, respectively). T2 effects differed significantly (P = 0.00) from T3 and T4. T2 and T1 also reduced pest attacks on leaves significantly (P = 0.00) compare to T3. Conclusion: Liquid extracts concoctions of biomass and pesticidal botanicals prove useful towards the development of effective bio-repellent organic fertilizers. These can contribute to reducing the use of synthetic agro-chemicals, hence decreasing residual environmental and human health hazards.

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“…53 Studies on the biosynthesis of the aromatic ring of chromenes were carried out by feeding 14 C-labelled compounds and stable isotopes. 53 Although earlier studies suggesting a biogenetic origin from acetate were reported, 54 the results obtained indicated that the aromatic ring of these products originates from the shikimic acid pathway. 53 The studies were carried out by feeding of [ 14 C]phenylalanine and L-[2-13 C]-phenylalanine; the incorporation was analysed by GC-MS and 13 C NMR.…”

Section: Biosynthesis Of Metabolites Isolated From Eutypa and Related...mentioning

confidence: 92%

Metabolites from Eutypa species that are pathogens on grapes

2006

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Structural and synthetic studies of the metabolites isolated from Eutypa lata are reviewed. This fungus is the causative agent of Eutypa dieback disease, also known as eutyposis or dying-arm disease, a perennial canker that affects grapevines and many other woody fruit plants. The review, which encompasses all the literature in this field up to the present and in which 76 references are cited, also includes a detailed study of the biological activity of the metabolites, especially the role of toxins in the development of the plant disease. Some aspects of the synthesis and biosynthesis of these metabolites and related compounds are discussed.

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Biosynthesis of precocenes-I and -II, anti-juvenile hormones

Cited by 11 publications

References 3 publications

Benzopyrans in Hypericum polyanthemum Klotzsch ex Reichardt cultured in vitro

Benzopyrans in Hypericum polyanthemum Klotzsch ex Reichardt cultured in vitro

Effectiveness of Fortified Liquid Organic Manure and Inorganic Fertilizer on the Growth, Physiological and Pesticidal Response of African Nightshade (Solanum scabrum)

Metabolites from Eutypa species that are pathogens on grapes

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