نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه جیرفت، جیرفت، ایران
2 گروه گیاهپزشکی، دانشکده کشاورزی، دانشگاه یاسوج، یاسوج، ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Plant growth-promoting rhizobacteria (PGPR) may influence plant defense against soil-borne and aerial pathogens as well as herbivores. The present study was conducted to assess the effect of using some PGPR strains of Bacillus subtilis, Pseudomonas fluorescens, and Azospirillum brasilense on biological and reproductive parameters of Tetranychus urticae Koch in cucumber plants. Cucumber plants were treated with the above-mentioned bacterial suspension (concentration of 107 CFU/g-1) during the two to four-leaf growth stage. Two generations of two-spotted spider mites were reared on the treated cucumber plants prior to the experimental assessments. The obtained results indicated that the application of rhizobacteria negatively influenced the biological parameters of T. urticae. The duration of the immature development period was significantly affected by the rhizobacteria, so the longest duration was related to B. subtilis (10.06 days). While the pre-oviposition period and adult male longevity remained unaffected by the rhizobacteria, the oviposition period (2.64 to 4.58 days), adult female longevity (1.81 to 3.35 days), and fecundity (9.22 to 12.07 eggs/female) were significantly reduced in treated groups compared to the control (without bacteria). The lowest values and the greatest reduction of these parameters were found in individuals fed on cucumber plants treated with B. subtilis. Results showed that the rhizobacteria used in this experiment, especially B. subtilis, strengthen and induce the anti-herbivore defense mechanisms in the cucumber plant against T. urticae.
کلیدواژهها [English]
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