Ej. Edwards et al., IS THERE A LINK BETWEEN GREENING AND LIGHT-ENHANCED GLYCOALKALOID ACCUMULATION IN POTATO (SOLANUM-TUBEROSUM L) TUBERS, Journal of the Science of Food and Agriculture, 76(3), 1998, pp. 327-333
Potato (Solanum tuberosum L) tubers (cvs Pentland Dell and Record) wer
e treated with the chlorophyll biosynthesis inhibitors 4-amino-5-fluor
opentanoic acid (AFPA) and 3-amino-2,3-dihydrobenzoic acid (gabaculine
), and subsequently exposed to daylight for up to 10 days prior to pig
ment and glycoalkaloid analysis. AFPA inhibited the accumulation of to
tal chlorophyll (Chi) by between 50 and 70% in both cultivars througho
ut the duration of light exposure. The synthesis of Chi b was inhibite
d by over 80% in both cultivars. Neither inhibitor had a significant e
ffect on light-enhanced glycoalkaloid accumulation. It is concluded th
at there is no direct metabolic link between Chi and glycoalkaloid bio
synthesis. (C) 1998 SCI.