บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Promotion of infection of orange fruit by Penicillium digitatum with a strain of Pseudomonas cepacia.

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

Phytopathology Year: 1991 Vol: 81 Issue: 6 Pages: 615-618 Ref: 18 ref.

1991

บทคัดย่อ

Promotion of infection of orange fruit by Penicillium digitatum with a strain of Pseudomonas cepacia.

Susceptibility of wounds in orange fruit to infection by P. digitatum decreased during periods of healing at 25 deg C and more so at 30 deg . Healing was correlated with lignification in wounded tissue and phenylalanine ammonia-lyase (PAL) activity that was 0.2 units/mg protein per hour in fresh wounds and, after 72 h, was 5.9 units at 25 deg and 8.8 units at 30 deg . A strain of Pseudomonas cepacia (ID 2129), added to fresh wounds, suppressed the healing process as revealed by slower lignification, a PAL activity after 72 h of 1.1 units at 25 and 30 deg , and a high susceptibility to infection by P. digitatum. The suppression was probably caused by a diffusible metabolite from P. cepacia present also in culture filtrates of the bacterium. It is concluded that care is needed in the use of biological control agents, such as strains of P. cepacia, with regard to their effect on the healing process in fruit.