Both growth temperature and photoperiod affected the content
of seven individual glucosinolates before the cold acclimatisation
period. The responses varied depending on glucosinolate type,
and several different interactions between growth temperature
and photoperiod were observed. Long day combined with high
growth temperature (21/15 C) resulted in a 45% lower content
of glucoiberin compared to the other treatments. Whilst for the
other two aliphatic glucosinolates, glucoraphanin and sinigrin, an
effect of photoperiod and growth temperature was observed. Here
the contents were higher at 12 h compared to 24 h photoperiod
and lower at (15/9 C) versus high (21/15 C) growth temperature.
Gluconasturtiin, the only aromatic glucosinolate, was detected in
low amounts; however the content was highly affected by an interaction
between the growth factors. Low growth temperature combined
with 12 h day length led to the highest content of
gluconasturtiin, 4-fold higher than the other treatments. The indolic
glucobrassicin was of higher content under 12 h versus
24 h day length at low growth temperature (15/9 C), whilst there
were no differences between day lengths at high growth temperature
(21/15 C). 4-Methoxyglucobrassicin was of higher content
under 24 h at low growth temperature (15/9 C) compared to the
other treatments. Whilst only an effect of day length was observed
for neo-glucobrassicin, with higher contents under 12 h versus
24 h.
Both growth temperature and photoperiod affected the contentof seven individual glucosinolates before the cold acclimatisationperiod. The responses varied depending on glucosinolate type,and several different interactions between growth temperatureand photoperiod were observed. Long day combined with highgrowth temperature (21/15 C) resulted in a 45% lower contentof glucoiberin compared to the other treatments. Whilst for theother two aliphatic glucosinolates, glucoraphanin and sinigrin, aneffect of photoperiod and growth temperature was observed. Herethe contents were higher at 12 h compared to 24 h photoperiodand lower at (15/9 C) versus high (21/15 C) growth temperature.Gluconasturtiin, the only aromatic glucosinolate, was detected inlow amounts; however the content was highly affected by an interactionbetween the growth factors. Low growth temperature combinedwith 12 h day length led to the highest content ofgluconasturtiin, 4-fold higher than the other treatments. The indolicglucobrassicin was of higher content under 12 h versus24 h day length at low growth temperature (15/9 C), whilst therewere no differences between day lengths at high growth temperature(21/15 C). 4-Methoxyglucobrassicin was of higher contentunder 24 h at low growth temperature (15/9 C) compared to theother treatments. Whilst only an effect of day length was observedfor neo-glucobrassicin, with higher contents under 12 h versus24 h.
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