ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Postharvest resistance of wounds in orange cv. Valencia to Penicillium digitatum.

Bonnas, D. S.; Chitarra, M. I. F.; Chitarra, A. B.; Machado, J. da C.; Gavilanes, M. L.;

Fitopatologia Brasileira Year: 1995 Vol: 20 Issue: 2 Pages: 169-173 Ref: 18 ref.

1995

บทคัดย่อ

ABSTRACT :

The effect of storage conditions on wound healing in oranges after exposure to high temp. for different healing times and resistance of healed tissues to infection by P. digitatum were investigated. Wounds (1 mm diam.x1 mm depth) were made on fruits stored at 30 deg C, RH 90%, under environmental conditions (20-25 deg , RH 82-95%) and left to heal for 24, 48 and 72 h. After inoculation with spore suspensions (2x106 spores/ml), fruits were transferred to room temp. Wounded uninoculated fruits were used as controls. In both experiments, fruit decay was observed for 20 d, 3 times a week. Decayed fruits were removed when a young active lesion developed. Discs around the wounded, inoculated but not decayed area were used for histochemical analyses (phenolic compounds, lignin, suberin, starch and cellular details) and phenylalanine ammonia lyase (PAL) activity. Resistance of tissue was not influenced by high temp. Lower levels of infection were observed 72 h after healing. Lignin-like compounds and wo

und periderm formation were not detected even 72 h after healing. Fruit resistance was related to phenolic compound synthesis at injury adjacent cell layers.