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

PDF file of entire paper: Print-quality (514K) | screen-quality (289K)

---

This year's abstracts | Journal home page | All abstracts | Publishing home page