Acinetobacter calcoaceticus SJ19 and Bacillus safensis SJ4, two Algerian rhizobacteria protecting tomato plants against Botrytis cinerea and promoting their growth
Foughalia, Abdelhamid | Bouaoud, Yousra | Chandeysson, Charlotte | Djedidi, Mawahib | Tahirine, Mohamed | Aissat, Kamel | Nicot, Philippe C. | Université Mohamed Khider de Biskra (BISKRA) | Centre de Recherche Scientifique et Technique sur les Régions Arides (CRSTRA) | Université Abderrahmane Mira [Université de Béjaïa] = University of Béjaïa = جامعة بجاية (UB) | Unité de Pathologie Végétale (PV) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Université de Batna 2 - Mostefa Ben Boulaid (Batna 2) | Ministry of Higher Education and Scientific Research of Algeria through scholarship awarded to Abdelhamid Foughalia
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Показать больше [+] Меньше [-]Английский. Background: Botrytis cinerea , the causal agent of grey mould, is a polyphagous fungus that infects a wide range of plants, including tomato. In many countries, including Algeria, the management of grey mould is a challenging problem, even with chemical control. This necessitates the search for other strategies. The objective of this study was to evaluate the biocontrol potential of two rhizospheric bacterial isolates for the protection of tomato against B. cinerea. Results: On tomato plants, the two bacterial isolates consistently provided high levels of protection (on average 72.1% for SJ19 and 52.3% for SJ4). Their applications as a 1:1 mixture reinforced their effect (87.8% protection), indicating their compatibility and a potential use as a consortium. In vitro, the isolates significantly inhibited the mycelial growth of B. cinerea strains, both through direct confrontation in dual-culture assays (12–69% inhibition) and through the production of volatile compounds (36–46% inhibition). The two isolates, applied as seed treatment and as drench on seedlings, also showed strong growth-promoting effects on tomatoes. They substantially increased the length and fresh weight of shoots and roots, as well as stem diameter, leaf number and chlorophyll content, compared to untreated plants. Conclusion: The two bacteria tested in this study showed a high potential for use as biostimulants and as biofungicides against tomato grey mould.
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