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Potential of chitosan coating in delaying the postharvest anthracnose (Colletotrichum gloeosporioides Penz.) of Eksotika II papaya

Authors

  • Asgar Ali,

    Corresponding author
    1.  School of Biosciences, Faculty of Science, The University of Nottingham Malaysia Campus, Semenyih, 43500 Selangor, D.E., Malaysia
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  • Mahmud Tengku Muda Muhammad,

    1.  Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, 43400 Selangor, D.E., Malaysia
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  • Kamaruzaman Sijam,

    1.  Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, 43400 Selangor, D.E., Malaysia
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  • Yasmeen Siddiqui

    1.  Laboratory of Food Crops and Floriculture, Institute of Tropical Agriculture, Universiti Putra Malaysia, Serdang, 43400 Selangor, D.E., Malaysia
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Correspondent: Fax: +6 (03) 8924 8018;
e-mail: Asgar.Ali@nottingham.edu.my

Summary

The in vitro and in vivo fungicidal activity of chitosan was studied against Colletotrichum gloeosporioides, the causal agent of anthracnose in papaya fruits. Chitosan at 1.5% and 2.0% concentrations showed a fungistatic effect with 90–100% inhibition (significant at P ≤ 0.05) of the fungal mycelial growth. Changes in the conidial morphology were also observed with the higher chitosan concentrations after 7- h incubation. In vivo studies showed that 1.5% and 2.0% chitosan coatings on papaya not only controlled the fruit decay but also delayed the onset of disease symptoms by 3–4 weeks during 5 weeks storage at 12 ± 1 °C and slowed down the subsequent disease development. However, when leaving the fruits to ripen at ambient temperature (28 ± 2 °C), 2.0% chitosan was less effective than 1.5% in controlling the disease development. Chitosan coatings also delayed the ripening process by maintaining the firmness levels, soluble solids concentration and titratable acidity values during and after storage.

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