Abstract:
A potted experiment with controlled fertilization supply was conducted to study the effects of different phosphorus-applying levels (P
0, 0 kg P·hm
-2; P
L, 42 kg P·hm
-2; P
M, 84 kg P·hm
-2; P
H, 168 kg P·hm
-2) on the growth of seedlings and camptothecin (CPT) accumulation in
C. acuminata seedlings. The experiment results showed that the height and dry weight of
C. acuminata seedlings would increase when phosphorus-applying level increased. Under different levels of applying phosphorus, the dry weight of leaf, shoot and root of
C. acuminata seedlings was significantly different (
p < 0.05). The CPT content in leaf, shoot and root reached the highest level when phosphorus-applying level was P L. Compared with P
0, the CPT content in P
L increased significantly. The CPT amount in the whole seedling, leaf and shoot of
C. acuminata increased gradually with the increase of phosphorus. But when phosphorus-applying level was higher than P
M, the increase of CPT amount was insignificant. The CPT amount in root reached the highest level when phosphorus-applying level was P
M. According to the results studied, proper deficient phosphorus stress could significantly enhance CPT content in
C. acuminata seedlings. With a main objective to establish a
C. acuminata seedling plantation for producing CPT, proper phosphorus level was P
M. CPT amount in seedlings was mainly decided by the accumulation of biomass of
C. acuminata.