ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Periharvest control of Botrytis cinerea rots in stored kiwifruit.

Poole, P. R.; McLeod, L. C.; Whitmore, K. J.; Whitaker, G.;

Acta Horticulturae Year: 1998 Issue: No. 464 Pages: 71-76 Ref: 5 ref.

1998

บทคัดย่อ

Freshly formed picking wounds on kiwifruits were inoculated with partially germinated B. cinerea conidia and the fruits were placed in 0 deg C cold storage 4 or 52 h later and examined over 16 weeks. Enzyme activity in stem-end woody tissues (conical section subtending the ring of sepal attachment) were sampled throughout fruit development to harvest maturity. In some fruits, the picking wound surfaces were treated immediately after formation with vinclozolin (8 or 70 micro g) or pentylpyrone (PP, 2.6 mg) in 5 micro l water. Delayed cold storage had a variable effect on the incidence of B. cinerea rots. Phenylalanine ammonia-lyase activity varied little during fruit development while peroxidase and chitinase showed a mid-season peak and marked increases at harvest maturity. Injury, inoculation and treatment with salicylic acid (fruits dipped in 1 mM salicylic acid 1 or 2 days prior to sampling) resulted in significant increases in phenylalanine ammonia-lyase and peroxidase activities, and smalle

r increases in chitinase activity. PP residues declined with a half-life of 16-20 days whereas vinclozolin residues declined only slowly and there were appreciable residues in internal tissues, increasing with longer storage. PP-treated fruits maintained firmness during cold storage but softened more rapidly on return to ambient, the effects diminishing with longer periods of cold storage. Phenylalanine was metabolized rapidly at the wound surface, producing a significant proportion of lignin-like polymer.