Comparison of the effect of separate and combined application of bacterial and fungal strains on control of Pythium damping-off and growth traits of tomato
کد مقاله : 1093-11THCBIOCONTROL (R2)
نسیم رضایی *1، ناهید معرف‌زاده2، سعید عباسی2، روح‌اله شریفی2، مهیار شیخ‌الاسلامی3
1گروه گیاهپزشکی
2گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه رازی، کرمانشاه، ایران
3مرکز تحقیقا ت و آموزش کشاورزی و منابع طبیعی استان کرمانشاه، بخش تحقیقات گیاه‌پزشکی
چکیده مقاله:
One of the most common biotic stresses of tomato (Solanum lycopersicum) is damping-off disease caused by Pythium aphanidermatum. The use of microbial agents as combinations is a promising strategy that can improve the stability and efficiency of biocontrol. In this research, the compatibility or antagonistic effect of biocontrol agents including four bacterial (Bacillus thuringiensis, Bacillus pumilus, Delftia tsuruhatensis and Pseudomonas putida) and two Trichoderma (T. afarasin and T. lixii) strains on each other was investigated in the laboratory. Bacterial strains did not negatively affect each other but they showed antagonistic activity against Trichoderma strains. In greenhouse test, all separate and combined antagonistic treatments (except for 4 treatments) decreased the incidence of damping-off caused by P. aphanidermatum and many of them increased the length, wet weight, dry weight and volume of root, wet weight, dry weight and length of foliage in the presence of the pathogen. Compared to the separate applications of biocontrol agents, some combined treatments had an additive effect on growth traits and disease control (T. afarasin + B. thrungiensis) but many had no additive effect on disease control or growth factors, and some in terms of improving plant growth, had a weaker effect than their individual treatments. As a result, the use of combination of biocontrol agents compared to their separate application, was not always more efficient in promoting the growth and the health of tomato plants.
کلیدواژه ها:
Antagonist, Biological Control, Adaptation, Growth Promotion, Trichoderma, Pythium aphanidermatum
وضعیت : چکیده برای ارائه به صورت پوستر پذیرفته شده است