Fig.5
It
can be seen from Figure 5 that the total polyphenol content ofDendrobium nobile varies with the zinc treatment concentration.
When the zinc concentration is less than 400μmol/L, the polyphenol
content gradually increases with the increase of zinc concentration.
When the zinc concentration is 400 μmol/L, compared with the control, it
is significantly higher than the control. When the zinc treatment time
is 14 days, the content of polyphenols reaches the maximum. When the
concentration of zinc was more than 400 μmol/L, the content of
polyphenols decreased with the increase of zinc concentration, but it
was still significantly higher than the control group.
It can be seen from Figure 5 that the flavonoid content ofDendrobium nobile varies with the zinc treatment concentration.
When the zinc concentration is less than 400μmol/L, the flavonoid
content gradually increases with the increase of zinc concentration.
When the zinc concentration was 400 μmol/L, it was significantly higher
than the control, and when the zinc treatment time was 21 days, the
content of flavonoids reached the maximum. When the zinc concentration
is more than 400 μmol/L, the content of polysaccharide decreases with
the increase of zinc concentration. When the zinc treatment time was
less than 21 days, it was still significantly higher than the control
group. However, when the zinc treatment time was more than 21 days, the
content of flavonoids decreased.