บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Efficacy of antagonistic bacteria in protection of apples against Botrytis cinerea and Penicillium expansum under CA conditions.

Sobiczewski, P.; Bryk, H.; Berczynski, S.;

Acta Horticulturae Year: 1999 Issue: No. 485 Pages: 351-355 Ref: 12 ref.

1999

บทคัดย่อ

Efficacy of antagonistic bacteria in protection of apples against Botrytis cinerea and Penicillium expansum under CA conditions.

Of 300 isolates of epiphytic bacteria originating from leaf and fruit surfaces of apple, 3 (B90, B194, B224) were selected which showed very high activity in protection of apples against grey mould (B. cinerea) and blue mould (P. expansum). The bacterial suspension of each isolate was placed on wounds of apples cv. Jonagold followed by inoculation with a conidial suspension of the particular pathogen. Apples were then stored in normal storage at 2-3 deg C or in controlled atmospheres (CA) containing 1.5% CO2 + 1.5% O2 or 5% CO2 + 3% O2. After 40 days, the diameter of the rot spot developed around each wound was measured and the number of bacteria determined. The tested bacterial isolates totally protected apples against P. expansum in all storage conditions. However, they showed differential activity against B. cinerea. In one experiment, total protection by all isolates was obtained only in CA. In a second experiment, only the isolate B90 was more effective in CA than in normal storage. No sign

ificant differences in protective activity of bacteria between the CA treatments were found. The number of bacteria of all isolates significantly decreased in wounds in CA, and in normal storage they decreased only in the case of isolates B90 and B224. The bacterial population was reduced most in the atmosphere containing 1.5% CO2 and 1.5% O2.