New Zealand Journal of Crop and Horticultural Science
abstracts
Effect of chitosan on ripening, enzymatic activity, and disease development
in mango (Mangifera indica) fruit
Pongphen Jitareerat
Sudkanueng Paumchai
Sirichai Kanlayanarat
Division of Postharvest Technology
School of Bioresources and Technology
King Mongkut’s University of Technology Thonburi
Bangkok 10150, Thailand
email: pongphen.jit@kmutt.ac.th
Somsiri Sangchote
Department of Plant Pathology
Faculty of Agriculture
Kasetsart University
Bangkok 10900, Thailand
Abstract The effects of chitosan on mycelial growth and
spore germination of Colletotrichum gloeosporioides were investigated
on potato dextrose agar (PDA) containing 0%, 0.5%, 1.0%, 1.5%, and 2.0% (w/v)
chitosan dissolved in 0.5% acetic acid. Complete inhibition of mycelial growth
and spore germination was observed in the medium containing only 0.5% acetic
acid. Media containing chitosan were less inhibitory, but the highest concentrations
of chitosan, at 1.5% and 2.0%, were more inhibitory than the lower concentrations
(0.5% and 1.0%). Chitosan treatment (0.5%, 1.0%, 1.5%, and 2.0%) of mangoes
(Mangifera
indica) previously inoculated with C. gloeosporioides resulted
in a lower rate of disease progression compared with the controls. Chitosan
concentrations of 0.5% and 1.0% had stimulatory effects on chitinase and
b-1,3-glucanase activities. Additionally, chitosan coatings in mangoes delayed
ripening and reduced respiration rate, ethylene production, and the loss
of weight, ascorbic acid, and total titratable acidity. However, the firmness
of mangoes treated at concentrations above 1% caused a perceptible decline
in sensory quality.
Keywords anthracnose; b-1,3-glucanase; chitinase; Colletotrichum
gloeosporioides
New Zealand Journal of Crop and Horticultural Science, 2007, Vol. 35:
211–218
0014–0671/07/3502–0211 © The Royal
Society of New Zealand 2007
H05135; Online publication date 15 May 2007. Received 3 October 2005;
accepted 29 September 2006
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