[Dynamic research of density on Platycodon grandiflorum dry material accumulation and platycodin D content in Platycodon grandiflorum].
OBJECTIVE
To study the dynamic changes of dry material accumulation and platycodin D content in Platycodon grandiflorum in different planting densities.


METHODS
Five different planting densities M1 (4 cm x 25 cm), M2 (6 cm x 25 cm), M3 (8 cm x 25 cm), M4 (10 cm x 25 cm) and M5 (12 cm x 25 cm) were designed in the plot experiment. The individual and colony biomass accumulation, dry material distribution, root yield and platycodin D content were measured in different stage.


RESULTS
In a certain density range the individual biomass in P. grandiflorum obviously declined with increasing density with the exception of biomass M2 > biomass M3. On the contrary, the colony biomass increased with the increasing density. Dry material accumulation in each organ in P. grandiflorum in different planting densities showed significance (P<0.05). The dry material distribution in organs in the different planting densities showed significance (P<0.05), and the dry material distribution in flower and fruit reached the minimal level in M2, in the same planting density the distribution in root reached the maximal; The dry material in stem, flower and fruit obviously declined with the increasing density, while the dry material in leaf increased. The individual root output increased with the increasing density, and it reached the highest in M2. The colony root yield increased with the increasing density. The platycodin D content in P. grandiflorum reached the highest in M2.


CONCLUSIONS
The result showed that a suitable planting density is very important to P. grandiflorum dry material accumulation and distribution, root yield, platycodin D content and colony yield.
Geng
Huiyun
H
College of Agronomy, Shandong Agricultural University, Taian 271018, China.
Wang
Jianhua
J
Cai
Aimin
A
Zhou
Hongying
H
Dong
Qiting
Q
Sun
Yinshi
Y
Xue
Yongfeng
Y
Ma
Xiaochong
X
Liu
Sha
S
D018514:Plant Structures / Q000254:growth & development / Q000378:metabolism; D031238:Platycodon / Q000254:growth & development* / Q000378:metabolism*; D012503:Saponins / Q000378:metabolism*; D012621:Seasons; D014315:Triterpenes / Q000378:metabolism*
D012503:Saponins; D014315:Triterpenes; C108953:platycodin D