ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Factors affecting UV-induced resistance in grapefruit against the green mould decay caused by Penicillium digitatum.

Droby, S.; Chalutz, E.; Horev, B.; Cohen, L.; Gaba, V.; Wilson, C. L.; Wisniewski, M.;

Plant Pathology Year: 1993 Vol: 42 Issue: 3 Pages: 418-424 Ref: 21 ref.

1993

บทคัดย่อ

Exposure of harvested grapefruit to UV light induced resistance against green mould decay caused by P. digitatum. Grapefruit picked at various times during the harvest season responded differently to UV treatments, with an increasing UV dose required for development of max. resistance as the season progressed. The initial UV dose required in Nov.-picked fruit for max. response was 4.8 kJ/m2. This declined to 1.6 and 3.2 kJ/m2 in Dec.- and Jan.-picked fruit, respectively, and then increased to 8 kJ/m2 in Feb.-picked fruit. Correspondingly, the min. percentage infection developing after UV treatment increased throughout the season from 0 to 35%. Max. resistance in UV-treated fruit developed 24-48 h after exposure to UV light and then decreased. Development of induced resistance in grapefruit peel was also affected by the temp. at which the fruit was stored 24 h after UV treatment and before infection with P. digitatum. In the UV-treated fruit, the fungus developed a sporadic mycelium with marked i

nhibition of sporulation. The activity of phenylalanine ammonia-lyase and peroxidase markedly increased in the peel following exposure of the fruit to UV light.