ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effects of CO2 on ethylene biosynthesis in 'Bartlett' pears.

Chavez-Franco, S. H.; Kader, A. A.;

Postharvest Biology and Technology Year: 1993 Vol: 3 Issue: 3 Pages: 183-190 Ref: 26 ref.

1993

บทคัดย่อ

Mature-green Bartlett [Williams' Bon Chretien] pear fruit discs (8 mm diameter and 10 mm thick) were placed under a continuous flow of air (control) or air enriched with 0.1, 0.5, 1, 5, 10 or 20% CO2 for up to 10 days at 20 deg C. Discs kept in air + 5, 10 or 20% CO2 exhibited lower ethylene production rates whereas discs kept in air + 0.5 or 1.0% CO2 exhibited higher ethylene production rates than discs kept in air. 1-Aminocyclopropane-1-carboxylic acid (ACC) synthase and ACC oxidase (ethylene forming enzyme, EFE) activities were measured in air + 1% CO2 and air + 20% CO2 treatments. ACC synthase and EFE activities were lower in air + 20% CO2 and higher in air + 1% CO2 than in discs stored in air. Discs kept in air + 5, 10 or 20% CO2 remained greener than discs stored in air. The results indicate that, depending on its concentration within pear fruit tissue, CO2 can either stimulate or inhibit EFE activity, and consequently ethylene production rate. At concentrations above 1%, CO2 retards ethyl

ene action.