[Effect of Astragalus membranaceus var. mongholicus seed extracts on seed germination and seedling growth of different Codonopsis pilosula caltiver].
OBJECTIVE
To reveal the allelopathy effect of Astragalus membranaceus var. mongholicus seeds and provide information for the intercrop production.


METHODS
The A. membranaceus. var. mongholicus seeds were soaked in distilled water for different time (12, 24, 36, 48, 60 h) , and then the seed extracts were used to study their effects on the seed germination, seedling growth and development of two Codonopsis pilosula.


RESULTS
The A. membranaceus var. mongholicus seeds contained some allelopathy compounds. Their soaked liquid had significantly influence on the seed germination and seedling growth of C. pilosula. The seed germination rate, germination power, germination index and vigor index of two C. pilosula calrivar were improved and then inhabited with soaking time elongation. The extract soaking for 24 h significantly improved the germination traits but the extract for 60 h appeared different degrees of inhibiting vigor. The seed extracts soaking ranging between 12 and 60 h all significantly improved the above plant growth of C. pilosula but significant inhibited their radicle growth in length. And with the soaking time elongation the facilitation effect weakened and the inhibiting effect enhanced, especially more significant in the C. pilosula caltivar (Baitiaodangshen).


CONCLUSIONS
The A. membranaceus var. mongholicus seeds have allelopathic compounds and the endogenous inhibitor can be extracted when soaked for more than 24 h in water with intact seeds, resulting in improvement of seed germination rate. The C. pilosula could be intercropped in A. membranaceus var. mongholicus field, however, when intercroped it should notice that the intercrop proportion should vary with the caltivar.
College of Life Science and Technology, Gansu Key Laboratory of Crop Genetic & Germplasm Enhancement Demonstration, Center of Experiments and Teaching for Plant Productions Gansu Provincial Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, China.
Feng-Xia
FX
Guo
Zhi-Jiang
ZJ
Wu
Yuan
Y
Chen
Zhuo-Xia
ZX
Xi
Xiao-Hu
XH
Zhang
Li-Rong
LR
Yao
Xiang
X
Chen
D027885:Astragalus propinquus / Q000737:chemistry*; D029745:Codonopsis / Q000187:drug effects* / Q000254:growth & development; D018525:Germination / Q000187:drug effects*; D010936:Plant Extracts / Q000494:pharmacology*; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development*; D012639:Seeds / Q000737:chemistry* / Q000254:growth & development
D010936:Plant Extracts