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Ahmed, Ahmed Sid; Sánchez, Consuelo Pérez; Castillo, María Emilia Candela

doi:10.1023/a:1008780022925

Cited by 97 publications

(7 citation statements)

References 32 publications

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“…The use of pepper would stimulate the defense mechanism of the plant and therefore enhance resistance to penetration and spread of the pathogen. Similar results were obtained through the work of Bigirimana et al (1997), Howell et al (2000), Sid Ahmed et al (2000) and Harman et al (2004) respectively in pre-infected bean, cotton, pepper and maize of T. virens and T. harzianum and attacked by Phytophthora sp. In addition, 40% of leaf disks treated with ethanolic extract had the wall of their cells destroyed.…”

Section: Evaluation Of the Effect Of Pepper Extracts On Leaf Discssupporting

confidence: 88%

Inhibitory effects of aqueous and ethanolic extracts of pepper (Capsicum annuum) on the development of necrosis caused by Phytophthora megakarya in Theobroma cacao

Claude¹,

Ifoue²,

Tayoukam³

et al. 2019

Int. J. Bio. Chem. Sci

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The cocoa tree (Theobroma cacao L.), also called "food of the gods", is a plant mainly cultivated for its beans. However, the cultivation of this plant is confronted with many parasitic attacks among which, attack due to Phytophthora megakarya which causes the most yield loss. The Control of this pathogen consisted in involving the use of aqueous and ethanolic extracts of pepper and two strains of Phytophthora megakarya in order to improve cocoa tolerance against the attack of this pathogen. These aqueous and ethanolic extracts were prepared in the laboratory and incorporated into Potato Dextrose Agar and Small Pea Agar culture media at concentrations (g / ml) of 10-1 , 10-2 , 10-3 and 10-4 , each containing a strain of Phytophthora megakarya. The results obtained revealed that all pepper treatments significantly inhibited the growth of Phytophthora megakarya with a 100% inhibition rate in the aqueous extract regardless of the strain used and inhibition rates of 89.33%. ; 63.35%; 54.39%; 42.86%; 100%; 70.22% and 57.54% for the ethanolic extract depending on the concentrations applied. In vivo treatment of leaf discs and pods detached prior to infection with Phytophthora megakarya resulted in significant inhibition, thereby reducing the incidence rate of disease severity. The values of this incidence vary from 0.1 to 1.2 for a percentage ranging from 0.5% to 20% of the severity of the disease depending on the nature of the extract of applied pepper. At concentrations (g / ml) 10-1 , 10-2 , 10-3 and 10-4 , the aqueous extract completely inhibited the growth of mycelium and the development of Phytophthora megakarya spores while the ethanolic extract of pepper showed its inhibitory power at the concentration 10-1 g/ml. The use of crude aqueous extracts or even diluted of pepper can therefore be considered in the fight against black pod desease in Cameroon.

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Section: Evaluation Of the Effect Of Pepper Extracts On Leaf Discssupporting

confidence: 88%

Inhibitory effects of aqueous and ethanolic extracts of pepper (Capsicum annuum) on the development of necrosis caused by Phytophthora megakarya in Theobroma cacao

Claude¹,

Ifoue²,

Tayoukam³

et al. 2019

Int. J. Bio. Chem. Sci

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“…and plant growth-promoting rhizobacteria(PGPR) [33] were also applied combined with pre-plant soil treatment to control root and soilborne disease. BCA were also used for seed treatment and root drenching to improve plant vigor[34, 35]. Soil drenching with BCA in crop growing season also increase the control effect on soilborne disease.…”

Section: Discussionmentioning

confidence: 99%

Dimethyl disulfide (DMDS) as an effective soil fumigant against nematodes in China

et al. 2019

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Root-knot nematode is an important soil pest in horticulture crops and constrains the protected cultivation development after methyl bromide (MB) was phased out in China. Dimethyl disulfide (DMDS) exhibits excellent efficacy against nematodes. Laboratory experiments and field trials were set up to clarify DMDS dose, efficacy, and yield. A dose-response experiment using three methods showed that DMDS presented high efficacy against the nematode Meloidogyne incongnita. The LC50 values of direct fumigation activity in the dessicator method were 0.086 and 0.070 mg L-1 for DMDS and 1,3-D, 29.865 and 18.851 mg L-1 for DMDS and 1,3-D of direct contact activity in the small tube method, 6.438 and 3.061 mg L-1 for DMDS and 1,3-D of soil fumigation activity in the soil fumigation method, respectively. The field trials indicated that DMDS showed an excellent efficacy of 80%−94% on root-knot nematode applied at 10−100 g m−2 on tomato in Tongzhou, Beijing. The crop yields showed no significant difference after applying 10–80 g m-2 DMDS. Results indicate that DMDS applied at 10 g m-2 for controlling root-knot nematode in Beijing is cost effective. In conclusion, DMDS is an excellent soil fumigant that can be used for controlling root-knot nematode and can be an potential novel alternative to MB in China.

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“…[16] Peptaibols, produced by the plant-growth-promoting fungi belonging to the Trichoderma genus, induce local and systemic defense responses in several plant species. [56][57][58][59][60] Interestingly, among the elicitors produced by Trichoderma spp., the secondary metabolite peptaibols probably also play a significant role in the plant hypersensitive response to these fungi. Alm has been shown to permeabilize both plasma and mitochondria membranes in tobacco cells; [37] it will be of interest to determine the permeabilization events induced by Alm in Arabidopsis and their exact role in initiating plant defense.…”

Section: Wwwchembiochemorgmentioning

confidence: 99%

Hypersensitive‐Like Response to the Pore‐Former Peptaibol Alamethicin in Arabidopsis Thaliana

Rippa¹,

Eid²,

Formaggio³

et al. 2010

ChemBioChem

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In Arabidopsis thaliana cell cultures, the peptaibol alamethicin induced a form of active cell death that was associated with cell shrinkage and DNA fragmentation. The transfer of mature A. thaliana plants from a peptide-free medium to a medium containing a moderate concentration of alamethicin caused the development of lesions in leaves after a few days. These lesions were characterized by cell death, deposition of callose, production of autofluorescent phenolic compounds, and transcription of defense genes, just like in the hypersensitive response to a pathogen attack. The induction of defense-like responses in Arabidopsis by other membrane-disrupting peptides was also evaluated. The peptides selected for comparison included the natural antimicrobial melittin and the peptaibol ampullosporin A, as well as synthetic analogues of the peptaibols cervinin and trichogin. The response amplitude in A. thaliana increased with the peptaibol's ability to permeabilize biological membranes through a pore-forming mechanism and was strongly associated with their content in the helicogenic α-aminoisobutyric acid residue.

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Cited by 97 publications

References 32 publications

Inhibitory effects of aqueous and ethanolic extracts of pepper (<i>Capsicum annuum</i>) on the development of necrosis caused by <i>Phytophthora megakarya</i> in <i>Theobroma cacao</i>

Inhibitory effects of aqueous and ethanolic extracts of pepper (<i>Capsicum annuum</i>) on the development of necrosis caused by <i>Phytophthora megakarya</i> in <i>Theobroma cacao</i>

Dimethyl disulfide (DMDS) as an effective soil fumigant against nematodes in China

Hypersensitive‐Like Response to the Pore‐Former Peptaibol Alamethicin in Arabidopsis Thaliana

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