DEPOT INSTITUTIONNEL UNIV DJELFA

Characterization of mechanisms involved in the effects of PGPR and Biocontrol of some Streptomyces spp. strains isolated from Steppic soils on tomato seedlings.

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dc.contributor.author Saila, Zineb
dc.date.accessioned 2023-02-20T08:49:00Z
dc.date.available 2023-02-20T08:49:00Z
dc.date.issued 2019
dc.identifier.uri http://dspace.univ-djelfa.dz:8080/xmlui/handle/123456789/4839
dc.description This work aimed to evaluate the PGPR and the Biocontrol effects of 4 streptomyces strains (TM52, IA1, D15, D54) on tomato seedlings (Solanum lycopersicum. L. cvMarmande). Two controls were used; the first was an ordinary control (non-treated seeds) and the second control represents tomato seeds treated with a chemical fungicide “Thirame” used to explore the effect of a chemical fungicide on seeds and in order to derive a comparison against with what is hopefully to be biopesticide “the bacterial strains”. The studied parameters in this work were: percentage of germination, biomass, chlorophyll content, cell membrane permeability, accumulation of total soluble sugars and proline and enzymatic activity. According to the obtained statistical results, seeds treated with the bacterial strains showed an improvement under normal conditions as well as under biotic stress conditions. For the PGPR effect, the strains “D15, D54, TM52” showed a high productivity than controls because they were characterized by an increase in the percentage of germinationand a decrease in the cell membrane permeability, accumulation of total soluble sugars and proline For the Biocontrol effect, D15, D54, and TM52 strains revealed an important resistance towards the biotic stress because they showed an increase in the percentage of germination and a decrease in cell membrane permeability, accumulation of proline and total soluble sugars. In addition to that D54 and TM52 strains showed lower peroxidase activity. In the light of the results of this modest work, we conclude that the D15, D54 and TM52 strains are the most efficient in terms of promoting tomato plants growth in normal conditions and in terms of promoting tomato plants resistance towards Fusarium. These results opens up prospects for exploitation of these four strains as excellent inocula for a field study to confirm their utility in improving tomato plants production and resistance to Fusarium. en_EN
dc.description.abstract L'utilisation des agents de biocontrôle et les agents PGPR est considérée comme une solution intéressante pour la production et la protection des cultures. Le présent travail consiste à étudier l’effet PGPR et Biocontrol de quatre souches de streptomyces (TM52, IA1, D54, D15) sur des plants de tomate en comparaison avec deux témoins. Des semences de tomates (Solanum lycopersicum. L. cv Marmande) traitées avec les souches bactériennes et les témoins ont été plantées pendant 40 jours, les paramètres suivants ont été mesurés: pourcentage de germination, la biomasse, les pigments photosynthétiques, la perméabilité membranaire, l’accumulation des sucres totaux solubles et de la proline, les activités catalase et peroxydase. Les résultats statistiques obtenus ont montré l’efficacité de ces souches "D15, D54, IA1 et TM52 " en termes de promotion de la croissance des plants de tomates dans des conditions normales et en termes de promotion de la résistance des plants de tomates dans des conditions de stress biotique. Ces résultats ouvrent les perspectives d’une étude de terrain visant à valider l’utilité de ces souches dans l’amélioration de la croissance de la tomate et sa résistance aux conditions de stress biotique. en_EN
dc.language.iso en en_EN
dc.publisher Université Ziane Achour/Faculté des Sciences de la Nature et de la Vie en_EN
dc.subject Tomate, PGPR, ABC, stress biotique, témoins en_EN
dc.title Characterization of mechanisms involved in the effects of PGPR and Biocontrol of some Streptomyces spp. strains isolated from Steppic soils on tomato seedlings. en_EN
dc.title.alternative Plant Biotechnology en_EN
dc.type Thesis en_EN


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