ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Physiological basis of low O2-induced residual respiratory effect in bell pepper fruit.

Rahman, A. S. A.; Huber, D. J.; Brecht, J. K.;

Acta Horticulturae Year: 1993 Issue: No. 343 Pages: 112-116 Ref: 5 ref.

1993

บทคัดย่อ

Previous studies have shown that bell pepper (Capsicum) fruits exposed to 1.5% O2 for one day exhibited suppressed CO2 production and O2 consumption for at least 24 h after transfer to air. In this study, bell pepper fruits (cv. Jupiter) were held in 1.5% O2 (balance N2) or air for 5 days at 20 deg C. Fruits held in 1.5% O2 were then exposed to humidified air for 24 h at 20 deg . After 5 days in 1.5% O2 or air, samples were removed for isolation of mitochondria. Samples were also removed 24 h after transfer to air. The steady state oxidative capacity of mitochondria isolated from fruits stored in 1.5% O2 for 5 days was reduced by about 45% compared with mitochondria from air-stored fruits. During subsequent holding for 24 h in air, the O2 uptake capacity recovered and attained values similar to those isolated from fruits held continuously in air. There were no observed differences in the ultrastructural features of mitochondria isolated from fruits held in 1.5% O2 for 5 days compared with those from freshly harvested fruits. Although whole fruit CO2 production and O2 consumption rates exhibited residual inhibition following low O2 exposure, the inhibition did not persist in isolated mitochondria. These data suggest that the residual respiratory responses may be due to the suppression of extramitochondrial low-affinity oxidases.