ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effects of O2 and CO2 partial pressure on senescence of oat leaves and broccoli miniflorets.

Veierskov, B.; Hansen, M.;

New Zealand Journal of Crop and Horticultural Science Year: 1992 Vol: 20 Issue: 2 Pages: 153-158 Ref: 19 ref.

1992

บทคัดย่อ

Effects of decreased O2 partial pressure p(O2) and increased CO2 partial pressure p(CO2) on senescence of 7-day-old plants or excised leaves of oat (cv. Victory) and broccoli miniflorets were studied in terms of chlorophyll and protein loss, proteolytic activity and stomatal behaviour. Senescence in darkness was delayed by decreasing p(O2), an effect which in oat leaves was unaffected by the p(CO2). However, increased p(CO2) at low O2 levels gave the best colour and flavour retention in broccoli miniflorets. Chlorophyll level increased by about 25% during the first 2-3 days after plants or excised leaves were placed in darkness at a p(O2) of 0.5 kPa. Protein and chlorophyll breakdown were inhibited when p(O2) was 2 kPa or less. Excision of leaves accelerated breakdown when compared with whole plants regardless of p(O2). Modification of ubiquitin conjugates was observed in broccoli miniflorets stored at reduced p(O2). The data indicate that ubiquitin-dependent proteolysis contributed to senescenc e of broccoli miniflorets.