Autotetraploidy induced in nianmaohuangqin (Radix Scutellariae Viscidulae) with colchicine in vitro.
OBJECTIVE
To establish and optimize the propagation of Nianmaohuangqin (Radix Scutellariae Viscidulae) and induce and characterize polyploidy of Nianmaohuangqin (Radix Scutellariae Viscidulae).


METHODS
Buds from germinating seed-derived explants were induced by tissue culture. With an orthogonal test, different concentrations of 6-benzyl-aminopurine (BAP), indole-3-acetic acid (IAA) and kinetin (KT) were used to determine the optimal concentrations for the propagation of Nianmaohuangqin (Radix Scutellariae Viscidulae). The different concentrations of IAA and rooting powder (ABT) were used to induce rooting. A 0.3% w/v colchicine solution was used to induce polyploidy and the induced buds was identified by root-tip chromosome determination and stomatal apparatus observation.


RESULTS
A large number of buds could be induced directly from epicotyl and hypocotyl explants on Murashige and Skoog (MS) (Murashige and Skoog 1962) medium supplemented with 1.1-1.3 mg/L BAP and 0.2 mg/L IAA. Root induction and development could be observed within 20 days of inoculation on 1/2 MS medium supplemented with 0.2 mg/L IAA and 0.1 mg/L ABT. Furthermore, 27 lines of autotetraploid individuals were obtained with a plantlet chromosome number of 2n = 4x = 36.


CONCLUSIONS
Autotetraploid lines could be obtained through induction with colchicine in vitro, proving that this method might be used for plant selection and breeding.
Heping
H
Huang
Shanlin
S
Gao
Dianlei
D
Wang
Peng
P
Huang
Jincai
J
Li
D003078:Colchicine / Q000494:pharmacology*; D010937:Plant Growth Regulators / Q000494:pharmacology*; D031364:Scutellaria baicalensis / Q000187:drug effects* / Q000235:genetics* / Q000254:growth & development; D057891:Tetraploidy
D010937:Plant Growth Regulators; D003078:Colchicine