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Articles by Sulastri Sulastri
Total Records ( 2 ) for Sulastri Sulastri
  Siti Nur Aisyah , Sulastri Sulastri , Retmi Retmi , Rahmi Henda Yani , Elly Syafriani , Lily Syukriani , Fatchiyah Fatchiyah , Amri Bakhtiar and Jamsari Jamsari
  Background and Objective: Plant-associated bacteria, such as Phyllobacterium play a significant role in protecting plant from pathogenic fungal infection. These Phyllobacterium are known to be existed in such a microbial community with various microbes thus leading to elevated disease suppression. The aim of this study was to assess the fungal suppression activity of indigenous Phyllobacterium isolates and its strain/species compatibility with rhizobacteria. Materials and Methods: Two indigenous Phyllobacterium isolates were identified using 16S rRNA gene sequence and its antifungal activities were tested against several phytopathogenic fungus. Further antagonistic assay was performed to compare the efficacy of cell culture and cell-free supernatants. Its compatibility was assayed by performing the antifungal assay using the combination of these Phyllobacterium isolates with rhizobacteria ones. Data were statistically analyzed using one-way analysis of variance and the significance was further processed using Duncan’s new multiple range test with a p<0.05. Results: Both isolates (UBCF_01 and UBCF_13), identified as Serratia plymuthica, exhibited higher suppression activity against Colletotrichum gloeosporioides compared to Fusarium oxysporum and Sclerotium rolfsii. Both isolates revealed opposite trend in their activities resulted from cultured cells and cell-free supernatants. Furthermore, the better suppression efficacy of the culture supernatants was resulted from single cultured cells, instead of co-culture. However, both isolates displayed quite poor compatibility with rhizobacteria isolates. Conclusion: These indigenous Phyllobacterium showed promising ability to be used as biocontrol agents for anthracnose. The application of its culture supernatants offered the less hazardous option of biological control implementation. However, their poor compatibility, even with the same species (rhizospheric UBCR_12) might be occurred due to habitat differences.
  Siti Nur Aisyah , Hafid Harnas , Sulastri Sulastri , Retmi Retmi , Helmi Fuaddi , Fatchiyah Fatchiyah , Amri Bakhtiar and Jamsari Jamsari
  Background and Objective: A new rhizobacteria isolate of Serratia plymuthica (strain UBCR_12) exhibited a promising potential as a biocontrol agent for anthracnose causing agent Colletotrichum gloeosporioides. The aim of this study was to characterize its antagonistic activity and explore the factors contributing to a higher inhibition activity. Materials and Methods: The antifungal effect of UBCR_12 against C. gloeosporioides was assayed under various pH values and nutritional sources. Culture supernatant obtained from UBCR_12 and C. gloeosporioides co-culture was also tested for its inhibitory activity. In addition, the antagonistic range of this isolate was examined against Sclerotium rolfsii and Fusarium oxysporum. Statistical analysis was done using one way analysis of variance and further processed using Fisher’s Least Significant Difference (LSD) test with a p<0.05. Results: The UBCR_12 induced inhibition was shown to be stable over time at pH 7, while peptone addition led to a faster induction (2 days after treatment) and glucose treatment to a higher activity. Of all these modifications, preliminary co-culture experiments with fungal cells resulted in the best antagonistic activity of UBCR_12 culture supernatant of about 30.66%. This isolate also showed a wide range of antagonistic activity due to its high suppression against S. rolfsii and F. oxysporum from soybean. Conclusion: Both environmental and biotic manipulations contributed an elevated inhibition rate of UBCR_12 against C. gloeosporioides. A proportional combination of the factors stimulating antagonistic activity of this strain is recommended to be utilized for the development of this strain as an antianthracnose. The enhanced antifungal effects of UBCR_12 resulted under each type of modification were varied indicating the difference of cell responses. It suggests that certain antifungal mechanism could be generated by modifying the environmental factor required for its induction. In addition, the application of cell-free culture supernatant provides an alternative solution in the utilization of biocontrol agents. For large scale application, it could minimize the risk of population outbreaks and harmful effects due to the living cells application.
 
 
 
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