REGULATION OF GLYCOLYTIC METABOLISM IN FRESH-CUT CARROTS UNDER LOW-OXYGEN ATMOSPHERE

Citation
H. Katonoguchi et Ae. Watada, REGULATION OF GLYCOLYTIC METABOLISM IN FRESH-CUT CARROTS UNDER LOW-OXYGEN ATMOSPHERE, Journal of the American Society for Horticultural Science, 121(1), 1996, pp. 123-126
Citations number
28
Categorie Soggetti
Horticulture
ISSN journal
00031062
Volume
121
Issue
1
Year of publication
1996
Pages
123 - 126
Database
ISI
SICI code
0003-1062(1996)121:1<123:ROGMIF>2.0.ZU;2-2
Abstract
Carrot (Daucus carota L.) shreds were stored under a continuous now of air or 0.5% and 2% O-2 (balance N-2) for 9 days at 5 and 15C. The res ulting changes in respiration, levels of glycolytic intermediates, and activities of ATP : phosphofructo kinase (ATP-PFK), and PPI : phospho fructokinase (PPi-PFK) were monitored. Carrots under low O-2 atmospher e exhibited an increase in RQ due to a greater reduction in O, consump tion than in CO, production, and the increase in RQ was greater at 0.5 % than at 2% O-2 at both temperatures. Fructose 1,6-bisphosphate (F1,6 P) accumulated with decreased O-2 atmosphere and was 2-fold greater at 0.5% than at 2% O-2 atmosphere at both temperatures. The levels of ot her glycolytic intermediates were not significantly influenced by low O-2. The increase in PPi-PFK activity occurred at the same time as F1, 6P accumulation. A similar relationship was not found with ATP-PFK. Th ese results suggest that PPi-PFK may be involved in regulation of glyc olysis under low O-2 atmosphere.