3.1.4 Effects of different concentrations of Zinc on chlorophyll
A and B contents of the leaves from Dendrobium nobile
Table 2 shows that in the same zinc treatment time, the content of
chlorophyll A and B increases first and then decreases with the increase
of zinc concentration. When the zinc concentration was 400 μmol/L, it
reached the maximum value, which was significantly different from the
control group. When zinc concentration was more than 400 μmol / L, the
content of chlorophyll A and chlorophyll B began to decrease. But at the
same zinc concentration, when the treatment time was 14 days, compared
with 7 days, chlorophyll A and B increased significantly. However, when
the treatment time was 21 days, compared with 14 days, the content of
chlorophyll AB increased, but the increase was not significant.
Table 2