Abstract:

After about 20 years of potato virus-free technology research and application, the same species of virus-free potato bred in different areas, the following generation plant showed a greater change at present. In this paper, ‘Zao Dabai’ potato cultivar that was bred from Benxi Potato Research Institute of Liaoning province(BX), Bashang Agricultural Science Academy of He Bei province(HB) and Da Xinganling Agricultural Science Academy of Heilongjiang(HLJ) province, they were used as materials for studying the epigenetic variations in biological characteristics, yield and quality of subculture plant of the virus-free seed potato. The results showed that: the subculture plant of the virus-free seed potato from HB showed the strong growth in the seeding stage, while after squaring period, there was a rapid increase in the plant height, stem width and leaf area for the subculture plant from HLJ, with a result of the delayed flowering stage and the prolonged growth period, which may conducive to the synthesis and accumulation of dry matter. Harvested after emergence 50 days, the yield and commodity rate of HB subculture had no significant difference compared with the control, while the subculture plant from HLJ was lower. Harvested after 60 days, the yield of HLJ subculture was increased by 30.26% than that of the control, but the content of soluble protein, soluble sugar, Vc and starch in potato tuber was no significant difference.