ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Control of storage decay of apples with Sporobolomyces roseus.

Janisiewicz, W. J.; Peterson, D. L.; Bors, R.;

Plant Disease Year: 1994 Vol: 78 Issue: 5 Pages: 466-470 Ref: 36 ref.

1994

บทคัดย่อ

ABSTRACT :

The biocontrol potential of an antagonist occurring naturally on pome fruit surfaces against postharvest diseases of apple (Malus x domestica) was investigated. Pink yeast, S. roseus (isolate FS-43-238), isolated from pear fruit reduced blue mould (Penicillium expansum) from 100 to 0% and grey mould (Botrytis cinerea) from 78 to 0% on wounded fruit drop-inoculated with suspensions containing 7.9 x 106 and 6.3 x 105 c.f.u./ml yeast cells, respectively, and then challenged with the pathogen at 104 conidia/ml. The reduction in the percentage of infected wounds and in av. lesion diam. followed a similar pattern and was effected by the antagonist and pathogen concn. On wounded apples dipped in the pathogen or antagonist-pathogen suspensions and stored for 3 months at 1 deg C, the incidence of rots was reduced from 33 to 0% for P. expansum and from 92 to 4% for B. cinerea at yeast concn of 7.9 and 5.3 x 106 c.f.u./ml, respectively. In spray application, where S. roseus was mixed with both pathogens (e

ach at 104 conidia/ml), <1% of fruit developed lesions in the antagonist-pathogen treatment, compared with 15% in the control and 9% in the thiabendazole treatment, after 6 months in storage at 1 deg . Wounds were readily colonized by S. roseus, and the populations increased from 4.3 to 6.1 log c.f.u./ml in drop-application experiments after 48 h at 18 deg and from 4.1 to 6.4 log c.f.u./ml in spray-application experiments after 3 months at 1 deg . It is suggested that, in addition to its effectiveness at relatively low concn, S. roseus shows promise for commercial development because it is ubiquitous in nature, occurs commonly on fruits, and does not grow at 36 deg .