K. Yamane et al., EXPORT OF SOLUBLE SUGARS AND INCREASE IN MEMBRANE-PERMEABILITY OF GLADIOLUS FLORETS DURING SENESCENCE, Engei Gakkai Zasshi, 62(3), 1993, pp. 575-580
Export of soluble sugar, changes in all membrane permeability, and pro
duction rate of ethylene in the perianths of the lower florets on the
gladiolus spikes were determined as related to physiological events af
fecting the wilting of perianths after they were fully unfolded. 1. Pe
rianths appeared to be wilting between 2 and 3 days after unfolding fu
lly (DAU). Concurrent with the onset of wilting, perianths rapidly dec
reased in fresh and dry weights. 2. Between 1 and 2 DAU, one day befor
e perianths started to wilt, total soluble sugar contents began to dec
rease. Between 2 and 3 DAU, the largest loss of total soluble sugars o
ccurred, most of which was possibly due to export from perianths to ot
her parts. Concurrent with the export of sugars, an increase in leakag
e of ions from perianth tissues was observed. 3. Rates in ethylene pro
duction of perianths did not show a significant change in relation to
the time of wilting. Depletion of sugars was discussed as related to t
he disintegration of membranes, which could cause perianths to wilt.