EFFECT OF SINGLE-WALL CARBON NANOTUBE ON SOYBEAN (GLYCINE MAX) REGENERATION FROM MATURE COTYLEDONARY NODE EXPLANTS

摘要

One of the major limitations in producing transgenic soybeans using the agrobacterium-mediated cotyledonary-node method is low regeneration frequency. An improved highly efficient regener ation system of soybean was established herein. Cotyledonary node explants were placed in shoot initiation medium with single-wall carbon nanotube (SWNT) for adventitious shoots regener ation, and adventitious shoots were subcultured in shoot elongation medium with SWNT for shoot elongation and rooting. 40 mg/L SWNT supplemented in shoot initiation medium was found to be the optimal concentration with shoots regeneration frequency significantly increased by 21. 5% compared with the control treatment, while for 4 mg/L and 400 mg/L, the increase was 4. 6% and 6. 5%, respectively. Faster elongation and rooting of adventitious shoots was observed in shoot elongation medium with 40 mg/L SWNT. Soybean plantlet formation frequency within the limited four weeks supplemented with 40 mg/L SWNT reached 48. 4% while in the other three treatments: 4 mg/L, 400 mg/L and control, 0% were observed. These results indicate that sup plement of SWNT in the soybean medium can efficiently promote adventitious shoots formation frequency, increase plantlet formation frequency and shorten the regeneration period.