نهمین کنفرانس ملی و اولین کنفرانس بین المللی فیزیولوژی گیاهی

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کد مقاله 1031

عنوان Differential effects of vegetative and endospore forms of Bacillus thuringiensis in AMF-mediated strawberry growth under contrasting phosphorus conditions

نویسندگان Seyedeh Fatemeh Fallah - Mansour Afshar-Mohammadian

چکیده Phosphorus (P) availability strongly affects strawberry (Fragaria × ananassa) growth and physiology, with symbiotic associations between arbuscular mycorrhizal fungi (AMF) and Bacillus thuringiensis playing a central role. This study evaluated three AMF species in combination with B. thuringiensis (vegetative and endospore forms) on strawberry growth and antioxidant defenses under no P, insoluble P, and available P conditions. According to the results, AMF colonization and plant growth were highest under insoluble P, particularly with A. langula (AM3) co-inoculated with vegetative B. thuringiensis, which enhanced shoot biomass and leaf number. Benefits declined under P-sufficient conditions, indicating reduced plant dependence on the symbionts. Additionally, the vegetative and endospore forms of Bacillus exerted distinct effects on biomass accumulation. Antioxidant enzyme activities (POD, CAT, APX) and PAL were differentially regulated by P availability: under P-limited conditions, PAL activity increased, supporting systemic defense via phenylpropanoid pathways, while enzymatic antioxidants were selectively modulated; sufficient P favored stronger antioxidant enzyme responses. These results demonstrate that AMF–B. thuringiensis co-inoculation enhances strawberry growth and defense in a P-dependent and bacterial form-specific manner, highlighting the potential of tailored microbial consortia for sustainable strawberry production.

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