ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Population dynamics of postharvest decay antagonists growing epiphytically and within wounds on grapefruit.

McGuire, R. G.;

Phytopathology Year: 2000 Vol: 90 Issue: 11 Pages: 1217-1223 Ref: 25 ref.

2000

บทคัดย่อ

Coating formulations of shellac, sucrose ester, and cellulose were tested that support populations of bacterial and yeast antagonists of post-harvest Penicillium decay of grapefruit. Surface populations of Pseudomonas syringae, P. fluorescens, and P. putida were stable between 103 and 104 CFU/cm2 on shellacked fruit over 4 months at 13 deg C, but numbers of the yeast Candida oleophila rose steadily from 2.35x103 to nearly 105. Through the first 15 days of cold storage, surface populations of P. syringae and C. oleophila were greater when applied to fruit within the pH 7.2 shellac than when applied by dipping fruit into an antagonist suspension and drying the fruit prior to shellacking; numbers were generally equivalent thereafter. Within wounds of shellacked fruit, populations of P. syringae were equal regardless of the method of application and increased from 104 to more than 1.2x107 CFU within 2 weeks. In contrast, numbers of C. oleophila in wounds over the first 2 weeks of storage were greate

r in fruit dipped and coated with shellac than when the antagonist was incorporated in this material; populations stabilized at approx equal to 6x106 CFU after 2 weeks. Incorporation of P. syringae and C. oleophila into ester and cellulose coatings, however, initially fostered greater numbers of both antagonists in wounds (approx equal to 106 CFU) than did the preliminary dip application, and significant population differences persisted for several weeks. In cold storage, although application method did not affect the efficacy of P. syringae, C. oleophila was more efficacious after 3 and 4 months when applied in the shellac than when applied by a preliminary immersion and subsequent drying of fruit prior to shellacking.