Discussion and suggestions of overseas potato germplasm introduction.

A total of 1 315 potato cultivars(clones),over 1 million true potato seed(TPS) progenies of more than 90 crosses and 110 clones of 13 wild and primitive species have been introduced from foreign countries since 1934.The most of them were used in potato production and breeding program directly or indirectly.Thirty two clones out of them were used directly as varieties in potato production after evaluation of multi-year and multi-site.More than 10 clones selected from the progenies of crosses introduced were released as cultivars.The potato germplasm used as parental lines accounted for about 90% out of the total parental lines.Many foreign varieties became main parents in potato breeding programs in China for high-yielding,good quality and multi-resistances.It is significant to enhance the introduction,evaluation and utilization.It is also important for enriching genetic basis of the germplasm of China,which is strategic counter-measure for international competition of biological resources increasingly.This paper made summarization based on the achievements of foreign potato germplasm introduction,and suggested that the introduction should be enhanced and be put forward for the future according to the changing situation.