Evaluation of nano silver particles and conventional biocides on microbial flora and proliferation within 'Cherry Brandy' rose vase solution
Mohammad Mahdi Jowkar, Nader Hassanzadeh
Abstracts of 7th International Postharvest Symposium 2012 (IPS2012). 25-29 June, 2012. Putra World Trade Centre (PWTC), Kuala Lumpur, Malaysia. 238 pages.
2012
บทคัดย่อ
Water relation interruption and stress are major causes of vase life reduction and senescence in cut flowers. The mentioned is mostly due to microorganism proliferation in the vase solution which leads to vascular occlusion and solution uptake reduction. In order to study the biocidal effect of nano silver particles and some conventional biocides, 'Cherry Brandy' roses were treated in a completely randomized design with: colloid ofnano silver particles, citric acid, aluminum sulfate, hydroxyquinoline citrate (HQC), calcium hypochlorite (Ca(ClO)2), sodium hypochlorite (NaOCl), tap water, or sterilized distilled water (control). Nano silver, HQC and Ca(ClO)2 were the most effective treatments in controlling microbial proliferation followed by aluminum sulfate. Two yeasts, 6 fungi, and 26 bacterial colonies were isolated from different vase solutions. Among the isolated fungi, one isolate was Trichoderma harzianum and the five other were different strains of Fusarium solani. Identified bacterial isolates were Bacillus sp., Coccus spp., Streptomyces sp., Pectobacterium sp., Burkholderia sp., and Pseudomonas sp. Identified Bacillus sp. isolates were B. polymexa, B. subtilis, B. megaterium and B. circulans. Results suggest nano silver application as a biocidal preservative solution for rose cut flowers as this compound is as effective as other conventional biocides and beside that it has ethylene antagonistic effects and therefore retards senescence in ethylene sensitive cut flowers.