جستجوی مقالات مرتبط با کلیدواژه « باکتری های همزیست » در نشریات گروه « گیاهپزشکی »

The greenhouse whitefly, Trialeurodes vaporariorum (Westwood), is one of the harmful pests of vegetables and ornamental plants. The high damage caused by this pest has made it necessary to design an integrated pest management (IPM) programs based on biology and its symbiotic relationships. Since the symbionts of greenhouse whiteflies are less known so far in Iran, their diversity in different pest populations has been investigated in the upcoming research. For this purpose, sampling was done from contaminated greenhouses and fields of Isfahan province. Then, DNA extraction and polymerase chain reaction (PCR) were performed to assess the presence/absence of symbionts, sequencing of target genes, and molecular identification of the whitefly species. Also, the cotton whitefly, Bemisia tabaci (Gennadius), was used as a control in different stages. The target species was identified as T. vaporariorum based on the morphology and cytochrome oxidase one (COI) gene sequence. Examining the diversity of symbionts showed the presence of Portiera sp. and Arsenophonus sp. in all collected populations. Hamiltonella sp. and Rickettsia sp. were detected in all populations except Kholenjan and Bagh Abrisham. Cardinium sp. has been observed in the population of Yafran and Fritschea sp. was detected in the populations of Khomeini Shahr, Nasim Abad, Kholenjan, Bagh Abrisham, and Yafran, while Wolbachia was not detected in any of the populations. Considering the lack of information about the symbiotic diversity of the greenhouse whitefly and also the lack of studies in Iran, this research can be a basis for further studies in the field of symbiosis and to recognize the role of symbionts.

In this study,symbiotic bacteria of Sitotorga cerealella were identified. Containers containing barley were stored in a growth chamber at a temperature of 24 ° C and a relative humidity of 65% after contamination. To separate the bacteria of Sitotorga cerealella gastrointestinal tract,10 healthy larvae were selected from the reared population. After disinfection, the larvae gastrointestinal tract was removed with ethanol 70%, sodium hypochlorite and distilled water5%. Then, one milliliter of 0.1 M phosphate buffer with pH 7 was used to homogenize the gastrointestinal tract. The homogeneous and diluted contents were cultured in nutrient agar medium. To perform polymerase chain reactions from 5 μl of Master Mix ,2 μl of extracted DNA, 1.5 μl of RP2 primer and 1.5 μl of FD1 primer and 15 μl Distilled Water that the total volume of these materials should reach 25 microliters. The PCR process was performed using general primers FD1 and RP2 and 16srRNA gene sequence in a thermocycle.The PCR product sequencing was performed in collaboration with South Korea&amps Bioneer and the results were reviewed at the NCBI site. The phenotypic characteristics of the isolated bacteria were determined by standard bacteriological methods. After reviewing all the prepared colonies and comparing the obtained results, the highest frequency in terms of number of colonies was specific to Enterococcus mundtii and Enterobacter hormaechei was less abundant in the gastrointestinal tract of Sitotorga cerealella. Also, according to electrophoresis, the highest bands observed belong to Enterobacter hormaechei and the shortest band belongs to Enterococcus mundtii.