FIGURE 5 Total phenol content of A. trifoliata in
different habitats
3.3 | Effects of rocky desertification on
enzyme activities of phenylpropanoid pathway in A. trifoliata
PAL, 4CL and C4H are the three most important enzymes in the
phenylpropanoid pathway, and their activities affect the secondary
metabolites of the basic phenylpropanoid pathway (Singh et al., 2009).
It can be seen from Figure 6 that in the Guanling base, the PAL activity
of roots and stems in the rocky desertification habitat first increased
and then decreased compared with the normal habitat, while the leaves
showed a gradually increasing trend. The difference of roots in
September was the biggest, increased by 1.35 times; The difference of
stems was the biggest in September, which increased by 6.28 times; The
difference of leaves in October was the biggest, increased by 1.28
times. In Huaxi base, the PAL activity of roots in rocky desertification
habitat increased first and then decreased compared with that in normal
habitat, while that in stems decreased and that in leaves increased. The
difference of roots was the biggest in October, increased by 1.20 times;
The difference of stems was the biggest in August, which decreased by
0.89 times; The difference of leaves in September and October was the
biggest, increased by 1.29 times and 1.33 times respectively. In
conclusion, the PAL activity in roots and leaves of A. trifoliatacould be increased in rocky desertification habitat.