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  • Combination of Kluyveromyces marxianus and sodium bicarbonate for controlling green mold of citrus fruit.

Combination of Kluyveromyces marxianus and sodium bicarbonate for controlling green mold of citrus fruit.

International journal of food microbiology (2011-09-17)
Peng Geng, Shaohua Chen, Meiying Hu, Muhammad Rizwan-Ul-Haq, Kaiping Lai, Fei Qu, Yanbo Zhang
ABSTRACT

Biocontrol efficacy of an antagonistic yeast Kluyveromyces marxianus was evaluated individually or in combination with sodium bicarbonate (SBC) against green mold of citrus fruit caused by Penicillium digitatum. Their effects on postharvest quality of citrus fruit were also investigated. The results indicated that the antagonistic activity of K. marxianus at 1×10⁸ CFU/mL on green mold of citrus fruit was enhanced by 2% SBC treatment. In artificial inoculation trials, disease control after 3 and 6 days, respectively, with the mixture of K. marxianus and 2% SBC (18.33%, 58.33%) was significantly improved over that obtained with K. marxianus (41.67%, 70.00%) or SBC (43.33%, 81.67%) alone. The combination of K. marxianus with SBC was as effective as the imazalil treatment in natural infection trials, which gave about 90% control of green mold. Addition of 2% SBC significantly stimulated the growth of K. marxianus in citrus fruit wounds after 72 h. Moreover, K. marxianus, SBC and their combination did not impair quality parameters including weight loss, fruit firmness, total soluble solids, titratable acidity and ascorbic acid at 4 °C for 30 days followed by 20 °C for 15 days. These results suggested that the use of SBC is a useful approach to improve the efficacy of K. marxianus for the postharvest green mold of citrus fruit.

MATERIALS
Product Number
Brand
Product Description

Supelco
Imazalil, PESTANAL®, analytical standard
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