Postharvest UV-C irradiation on cut Freesia hybrida L. inflorescences suppresses petal specking caused by Botrytis cinerea

Darras, Anastasios I., Joyce, Daryl C. and Terry, Leon A. (2010) Postharvest UV-C irradiation on cut Freesia hybrida L. inflorescences suppresses petal specking caused by Botrytis cinerea. Postharvest Biology And Technology, 55 3: 186-188. doi:10.1016/j.postharvbio.2009.09.005


Author Darras, Anastasios I.
Joyce, Daryl C.
Terry, Leon A.
Title Postharvest UV-C irradiation on cut Freesia hybrida L. inflorescences suppresses petal specking caused by Botrytis cinerea
Formatted title
Postharvest UV-C irradiation on cut Freesia hybrida L. inflorescences suppresses petal specking caused by Botrytis cinerea
Journal name Postharvest Biology And Technology   Check publisher's open access policy
ISSN 0925-5214
1873-2356
Publication date 2010-03-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.postharvbio.2009.09.005
Volume 55
Issue 3
Start page 186
End page 188
Total pages 3
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Postharvest petal specking caused by Botrytis cinerea is a major concern for freesia growers and sellers
in Holland and the UK. Germicidal and inducible host defence effects of UV-C irradiation were evaluated.
UV-C irradiation of freesia inflorescences after artificial inoculation with B. cinerea (i.e. the germicidal
effect) was more effective in reducing petal specking, compared to UV-C treatment before artificial
inoculation (i.e. the defence induction effect). Cut freesia inflorescences exposed to 1 kJm−2 UV-C after
artificial inoculation with 104 B. cinerea conidia mL−1 displayed reduced disease severity scores, lesion
numbers and lesion diameters by 74, 68 and 14%, respectively, compared to non-irradiated control inflorescences.
In contrast, UV-C irradiation with 1 kJm−2 before artificial inoculation reduced lesion numbers
and lesion diameters by 13 and 24%, compared to the non-irradiated controls. Higher UV-C doses of 2.5
or 5kJm−2 reduced disease severity scores, lesion numbers and lesion diameters when applied after
artificial inoculation, but enhanced disease when applied before artificial inoculation. Vase life of cut
freesia inflorescences irradiated with 0.5, 1 or 2.5 kJm−2 UV-C was maintained equal to non-irradiated
controls. However, 5 kJm−2 resulted in phytotoxicity evident as petal discoloration and reduced vase life
compared to non-irradiated inflorescences. © 2009 Elsevier
Keyword Defence response
Germicidal
Hormesis
Vase life
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online 18 November 2009. Published under heading: Research Note

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
 
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Created: Sun, 28 Feb 2010, 10:01:22 EST