ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Biological control of postharvest pear diseases using a bacterium, Pantoea agglomerans CPA-2.

Nunes, C., Usall, J., Teixido, N. and Vinas, I.

International Journal of Food Microbiology. Volume 70, Number 1-2, 2001. Pages 53-61.

2001

บทคัดย่อ

Epiphytic microorganisms isolated from the fruits and leaf surfaces of apples and pears were screened for antagonistic activity against Penicillium expansum on pears. From 247 microorganisms tested for antagonistic properties against P. expansum, a bacterium strain identified as Pantoea agglomerans (CPA-2) was selected. This bacterium was very effective against Botrytis cinerea, Penicillium expansum and Rhizopus stolonifer. Complete control at the three tested concentrations (2 x 107, 8 x 107 and 1 x 108 CFU/ml) was obtained on wounded pears inoculated with 103, 104 and 105 conidia/ml of P. expansum and R. stolonifer. At 8 x 107 CFU/ml, Pantoea agglomerans reduced B. cinerea decay by more than 80% at the three concentrations of the pathogen. In over 3 years of experiments in semicommercial trials, P. agglomerans provided excellent control against B. cinerea and Penicillium expansum under cold storage, either in air or in low oxygen atmospheres. Equal control was obtained with Pantoea agglomerans at 8 x 107 CFU/ml, as with the fungicide imazalil at commercial doses, against both pathogens. P. agglomerans grew well inside wounds on pears at both room and cold temperatures and under modified atmospheres. In contrast, it grew poorly on the surface of intact fruit.