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Evaluation of Streptomyces spp. against Fusarium oxysporum f. sp. ciceris for the management of chickpea wilt

100%

Amini J. , Agapoor Z. , Ashengroph M.

Journal of Plant Protection Research

2016

tom 56

nr 3

In this study, about 112 isolates of Streptomyces were isolated from chickpea rhizospheric soils. Among the isolated strains, five showed strong inhibitory effects against chickpea Fusarium wilt caused by Fusarium oxysporum f. sp. ciceris in vitro using plate assay and selected for further studies. The selected strains were identified as Streptomyces spp. based on morphological and biochemical characterization as well as 16S rDNA sequences analysis. Our results assigned them to strains related to genus of Streptomyces. In vitro, antagonistic effects of Streptomyces strains against the disease were evaluated through the dual-culture method, volatile and non-volatile metabolites, siderophore, protease and chitinase production. All bacterial strains inhibited mycelial growth of the pathogen ranging from 26 to 44.2% in dual culture assay. The non-volatile extract of five of the Streptomyces strains inhibited more than 50% growth of the pathogen, whereas volatile compounds were less effective on mycelial growth inhibition (20.2 to 33.4%). The ability of the biocontrol agents to produce siderophore and protease were varied, whereas, production of chitinase was detected for all strains. Results of the greenhouse assay indicated that all biocontrol agents reduced disease severity (ranging from 38.7 to 54.8%). Accordingly, strain KS62 showed higher control efficacy (54.8%). In addition, the biomass of chickpea plants (plant height and dry weight) significantly increased in plants treated with Streptomyces strains compared to non-bacterized control. The results of this study showed that it may be possible to manage chickpea Fusarium wilt disease effectively by using Streptomyces species, as biocontrol agents. Therefore, evaluating their efficiency under field conditions is needed.

In-vitro assay of some plant extracts against Fusarium oxysporum f. sp. lycopersici causal agent of tomato wilt

84%

Agbenin O. N. , Marley P. S.

Journal of Plant Protection Research

2006

tom 46

nr 3

215-220

The effect of crude extracts of neem (Azadirachta indica) leaf, neem seed and garlic (Allium sativum) at concentrations ranging from 5% to 30% of the material in 100 ml of Potato Dextrose Agar on mycelial growth of Fusarium oxysporum f. sp. lycopersici was assessed. All the extracts inhibited mycellial growth at various levels. Dry neem seed extract gavel 100% inhibition of mycelial growth. Fresh neem leaf extract reduced mycelial growth with increasing concentration while in garlic there were no differences in growth inhibition among the various concentrations used. However garlic extracts decreased sporulation with increasing concentration and cultures grown on extract amended agar plates remained viable.

Badano działanie surowych ekstraktów z liści i nasion Azadirachta indica oraz z ząbków czosnku (Allium sativum), dodawanych do pożywki ziemniaczanej z glukozą (PDA) w stężeniach od 5% do 30%, a na wzrost grzybni Fusarium oxysporum f. sp. lycopersici. Wszystkie badane ekstrakty inhibowały w zróżnicowanym stopniu wzrost grzybni tego patogena. Ekstrakt z suchych nasion A indica inhibował wzrost grzybni w 100 procentach. Ekstrakt ze świeżych liści tej rośliny ograniczał wzrost grzybni proporcjonalnie do stężenia w pożywce, natomiast w przypadku ekstraktu z czosnku nie stwierdzono różnic w stopniu inhibicji grzybni w uzależnieniu od stężenia. Wyciąg z czosnku ograniczał natomiast zarodnikowanie patogena proporcjonalnie do stężenia w pożywce, a kultury rosnące na płytkach agarowych z dodatkiem tego wyciągu zachowywały żywotność.

Control of wilt and root rot incidence in Phaseolus vulgaris L. by some plant volatile compounds

84%

El-Mougy N. S. , El-Gamal N. G. , Abdel-Kader M. M.

tom 47

nr 3

Relationship between pathogenicity, race and vegetative compatibility grouping among Algerian populations of Fusarium oxysporum f. sp. pisi causing pea wilt

84%

Merzoug A. , Belabid L.

Journal of Plant Protection Research

2017

tom 57

nr 4

Fusarium oxysporum f. sp. pisi (FOP) is a significant and destructive pathogen of field pea in Algeria. In the present study, 50 isolates of F. oxysporum f. sp. pisi, the causal agent of pea (Pisum sativum) wilt, collected from different parts of western Algeria and representing four races of the pathogen, were analyzed for virulence. The wilt incidence ranged from 6.66 to 88.33% on a highly susceptible cultivar (Little Marvel). Twenty-one isolates belonging to four races of FOP and one nonpathogenic F. oxysporum (FO) isolate were analyzed for vegetative compatibility in order to reveal the genetic structure of the population and to check the reliability of the method for the identification of physiological races of FOP. Obtained results showed that the FOP isolates could be classified into four main vegetative compatibility groups (VCGs) that corresponded to races l, 2A, 2B and 5. The race 6 isolate fell into the race 1 VCG. To our knowledge, this is the first such study in Algeria of its kind.

In-vitro assay of some plant extracts against Fusarium oxysporum f. sp. Lycopersici causal agent of tomato wilt

83%

Agbenin O. N. , Marley P. S.