The Role of Alkaloids in Plants

Waller, George R.; Nowacki, E.

doi:10.1007/978-1-4684-0772-3_5

Cited by 28 publications

(18 citation statements)

References 63 publications

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“…The methoxy ( -OCH3) and methyl (-CH3) groups of the molecule may be responsible for the biological activity against S. littoralis larvae as they were found in the two first compounds (harmine, harmaline) while only one was in the third harmalol. These findings are in agreement with many authors who attributed the activity of different naturally occurring compounds to the presence of special chemical groups in the molecule, oxygen, methyl group, methoxy and sugar moitey ( WALLER and NOWACKI, 1978;HOSTETTMANN et al, 1982;DIMETRY et a1.,1992). …”

Section: Biological Investigationsupporting

confidence: 93%

Chemical and biological investigation of harmal plant. 2. Alkaloidal investigation

El‐Gengaihi

Dimetry

Mohamed

1997

J Applied Entomology

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Section: Biological Investigationsupporting

confidence: 93%

Chemical and biological investigation of harmal plant. 2. Alkaloidal investigation

El‐Gengaihi

Dimetry

Mohamed

1997

J Applied Entomology

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“…For example, while the natural esters, eg cevadine (3) and veratridine (5), are among the most potent insecticides, they are not good antimicrobial agents. The aliphatic oleoyl ester (13) and the aromatic 3,4-dichlorobenzoyl ester 24 had low insecticidal activity but aþected P halstedii through all its developmental stages. However, the 3,5-dimethoxybenzoyl ester 18 had substantially improved insecticidal and antiperonospora activity with regard to the natural ester 5.…”

Section: Discussionmentioning

confidence: 97%

“…The MIC value of 3,4-dichlorobenzoyl ester 24, the most potent compound in this respect, was 104-fold lower than that of veratridine (0.01 and 100 lM, respectively). The oleoyl ester (13) was also highly active (MIC \ 1 lM). Simple ester derivatives of veracevine inhibited the motility apparatus of zoospores more eþectively than the parent alkamine 1, except vanillate 4 and veratrate 5.…”

Section: Species Bmentioning

confidence: 99%

Botanical fungicides: natural and semi-synthetic ceveratrum alkaloids

Oros

Ujváry

1999

Pestic. Sci.

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: The practical potential of the main bioactive principles of sabadilla, a botanical insecticide prepared from the seeds of Schoenocaulon officinale, and related semi-synthetic ceveratrum alkaloids in controlling phytopathogenic bacteria and fungi was explored. Evaluating 35 compounds belonging to this group of steroid alkaloids revealed antimicrobial eþ ects against Erwinia, Corynebacterium, Fusarium, Glomerella and Plasmopara species. Signiücant activities were displayed against the sunýower downy mildew fungus, Plasmopara halstedii. The ceveratrum alkaloids are thought to interact with the cell membrane, disrupting its integrity and/or altering its function. In contrast to commercial fungicides aþ ecting either the parasitising thallus or the asexual spores of P. halstedii, ie, only a single developmental stage, the alkaloids tested disrupt its life cycle at several points in hostdependent and host-independent stages. Among the natural alkaloids, cevacine and cevadine were the most eþ ective against sunýower downy mildew and the activity of the semi-synthetic oleoyl veracevine and cevagenine was comparable to that of metalaxyl. Sunýowers showed good tolerance to these highly active natural and semi-synthetic ceveratrum alkaloids. Our results indicate that the modest anti-oomycete activity of the natural sabadilla components can be greatly improved by appropriate structural modiücations and thus establish the ceveratrum alkaloids as potential antifungal agents with a novel mode of action.

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“…The presence of alkaloids discourage insects from ingesting plants. They protect plants against attack of predators (insects and herbivores) by acting as defense compounds (Waller andNowacki, 1978 &Matsuura andFett-Neto, 2015). Also Dambolena et al (2016) in their research, confirmed that terpene have potentials for insect management.…”

Section: Plate 1: Showing Formulated Biopesticide In Spray Bottlementioning

confidence: 91%

Bio-pesticide actions of aqueous extract of Ocimum gratissimum, Piper nigrum, Xylopia aethiopica, Azadirachta indica and Zingiber officinale formulation on cowpea leaves

Ikechi–Nwogu¹,

Omeke²

2020

Journal of Applied Sciences and Environmental Management

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The emergence of widespread insecticide resistance and the potential environmental problems associated with synthetic pesticides have indicated more interest for bio-pesticide usage in pest control. This study investigates the efficacy of a bio-pesticide formulation based on the aqueous extract of five plants namely Ocimum gratissimum, Piper nigrum, Xylopia aethiopica, Azadirachta indica, and Zingiber officinale in reducing cowpea leaf damage in event of bean beetle attach. Cowpea seeds were sown in four (4) different pots containing loamy soil and kept separately in the field at a distance of 10meters. Seven 7 days after foliage production, pots 1 and 2 were treated with 250ml of the formulations daily for 7 days, while pot 3 and 4 were not treated. From observations, the treated Cowpea plants were not attacked by bean beetle, while the untreated Cowpea plants were attacked by bean beetle, causing great damage on the foliage and this can lead to wilting, chlorosis and other fungal and bacterial diseases. Synthetic pesticides used for pests control, have adverse effects on crops and environment, but bio-pesticides formulated in this research is environmentally friendly, target specific and biodegradable. The extracts showed significant effect at p<0.05.

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The Role of Alkaloids in Plants

Cited by 28 publications

References 63 publications

Chemical and biological investigation of harmal plant. 2. Alkaloidal investigation

Chemical and biological investigation of harmal plant. 2. Alkaloidal investigation

Botanical fungicides: natural and semi-synthetic ceveratrum alkaloids

Bio-pesticide actions of aqueous extract of <i>Ocimum gratissimum</i>, <i>Piper nigrum</i>, <i>Xylopia aethiopica</i>, <i>Azadirachta indica</i> and <i>Zingiber officinale</i> formulation on cowpea leaves

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