A, Fructan accumulation in onion leaves. TLC of
sugars extracted from onion leaves after several time intervals of
continuous illumination and feeding of 5% Suc. F, Fru; G, Glc; S, Suc;
N-K, neokestose; 1-K, 1-kestose; Nys, nystose; DP1-DP6, inulin fructan
with a degree of polymerization of 1 to 6; O, sugar products of onion
bulb; C, inulin from chicory. B, mRNA levels of 1-SST, invertase, and
6G-FFT during fructan accumulation in onion leaves. Northern blots
contain approximately 20 μg of total RNA from onion leaves treated
similarly as the ones used in A. cDNA clones encoding onion 1-SST,
invertase, and 6G-FFT were used as probes. An Arabidopsis
18S rRNA probe was used as a loading control.