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Investigation of potential antibacterial action for postharvest copper treatments of cut Acacia holosericea

Ratnayake, K. and Joyce, D. C. and Webb, R. I. (2012) Investigation of potential antibacterial action for postharvest copper treatments of cut Acacia holosericea. Postharvest Biology and Technology, 70 . pp. 59-69. ISSN 09255214 (ISSN)

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Article Link(s): http://dx.doi.org/10.1016/j.postharvbio.2012.04.00...

Abstract

The mechanisms of action of Cu 2+ in improving the longevity of cut flowers and foliage have not been elucidated. Possible antimicrobial action of Cu 2+ against stem end and vase solution colonising bacteria was investigated using Cu 2+ treatments optimised for cut Acacia holosericea A. Cunn. ex G. Don foliage stems. These treatments were a 5h pulse with 2.2mM Cu 2+ or a 0.5mM Cu 2+ vase solution versus a deionised water (no Cu 2+) control. Bacterial growth over time was assessed by a standard plate count agar technique and with scanning electron microscopy. Cu 2+ treatments significantly extended the cut foliage vase life. However, they did not have sustained antibacterial activity against stem end or vase solution colonising bacteria. Also, regular recutting of 1-2cm from the stem ends did not substantially improve either cut stem water relations or longevity. The positive effects of Cu 2+ treatments were unaffected by the repeated stem end recutting. It was concluded that the primary mechanism of Cu 2+ was not antibacterial. Moreover, naturally growing vase solution and stem end microbial populations had relatively insignificant effects on cut A. holosericea vase life. Research into alternative mechanisms of Cu 2+ is required. © 2012 Elsevier B.V.

Item Type:Article
Business groups:Horticulture and Forestry Science
Additional Information::doi 10.1016/j.postharvbio.2012.04.004 Language of Original Document: English Correspondence Address: Ratnayake, K.; Department of Horticulture and Landscape Gardening, Faculty of Agriculture and Plantation Management, Wayamba University, Makandura, Gonawila NWP, KG 60170, Sri Lanka; email: kamani.ratnayake@uqconnect.edu.au
Keywords:Acacia holosericea Bacteria Copper SEM Vase life Water relations Acacia Bacteria (microorganisms)
Subjects:Plant culture > Flowers and flower culture. Ornamental plants > Care and preparation of cut flowers and ornamental plants for market
Plant culture > Flowers and flower culture. Ornamental plants
Deposited On:03 Sep 2013 05:20
Last Modified:04 Nov 2015 02:59

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