บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effect of Pseudomonas cepacia on postharvest biocontrol of infection by Penicillium digitatum and on wound responses of citrus fruit.

Huang, Y.; Deverall, B. J.; Morris, S. C.;

Australasian Plant Pathology Year: 1993 Vol: 22 Issue: 3 Pages: 84-93 Ref: 23 ref.

1993

บทคัดย่อ

Effect of Pseudomonas cepacia on postharvest biocontrol of infection by Penicillium digitatum and on wound responses of citrus fruit.

An isolate of P. cepacia (ID 2131) inhibited germination of P. digitatum and showed strong ability to protect wounded oranges from infection by P. digitatum. The protective ability of this bacterial strain was closely related to cell concn within the range of 1.8 x 105 to 109 c.f.u./ml (r=0.867). The mode of action in biocontrol provided by this antagonist is possibly due to the production of an antibiotic and to spatial separation of the fungal spores from the damaged fruit tissue. Brown pigmentation appeared around some wound sites when the cell concn exceeded 107 c.f.u./ml. At injured sites, the activity of phenylalanine ammonia lyase was suppressed and the accumulation of lignin inhibited. It is suggested that suppression of the host wound healing by the bacteria may make the niche at the wound sites unfavourable for the bacteria to survive. If P. cepacia (ID 2131) was mixed with a strain of P. cepacia (ID 2129) that promoted infection by P. digitatum before being applied to the fruit, the effect of biocontrol was lost.