How and how much Bacillus spp. induce resistance in tomato plants against pathogens and insect pests?
کد مقاله : 1018-11THCBIOCONTROL (R1)
سمیه رحیمی کلده *1، مسعود احمدزاده2، اکرم شانقی2، سلیمان قاسمی3
1گروه گیاهپزشکی دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران کارشناس فنی و مدیر منطقه ای مارکتینگ شرکت فن آوری زیستی طبیعت گرا
2گروه گیاهپزشکی، دانشکدگان کشاورزی و منابع طبیعی دانشگاه تهران، کرج، ایران
3مدیر تحقیق و توسعه تولیدات گیاهی شرکت فناوری زیستی طبیعت گرا، کرج
چکیده مقاله:
Pests can cause significant economic losses to agricultural crops. Generally, chemical pesticides are extensively used to control them and prevent crop yield losses. The widespread long-term use of chemicals can cause resistance risk, and damage to the environment and non-target organisms. In this research, we have investigated the antifungal and insecticidal potential of Bacillus velezensis UTB96, B. velezensis UTB97, and B. licheniformis against Fusarium oxysporum f. sp. lycopersici and Trialeurodes vaporariorum in laboratory and greenhouse conditions. All Bacillus strains have indicated suppression ability against pathogens in both laboratory and greenhouses. A higher percentage of growth inhibition was caused by B. licheniformis and B. velezensis UTB96 which was 55.83%. As a result, infected tomatoes have revealed more aerial and root wet and dry weight when treated by all Bacillus strains. The lowest oviposition rate of T. vaporariorum was observed on tomatoes treated with B. licheniformis. The number of whitefly offspring on tomato leaves that were treated with distilled water, B. velezensis UTB96, B. velezensis UTB97, and B. licheniformis were 6, 5.33, 4, and 1 offspring. B. licheniformis showed the highest mortality rate of T. vaporariorum which was equal to 51.33% when it includes both bacteria and metabolites. Surfactants as secondary metabolites could increase systemic plant resistance and based on our data, B. velezensis UTB96 produces more surfactin and iturin than two other strains while B. licheniformis produces more fengycin so we concluded that fengycin has a very important role in inducing resistance in tomato plants against pathogens and insect pests.
کلیدواژه ها:
Bacillus spp., Fusarium oxysporum, surfactin, iturin, fengycin, biological control
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