A ccording to some problems of in vitro rooting difficult in virus free and in vitro multiplication of some grape cultivars, some important effects of in vitro microenvironment, light, temperature, pH value and compositions of culture media on the rooting in vitro of grape test-tube plantlets, the content changes of endogenous hormones and endogenous metal elements, and the differences of endogenous materials and biological effects of DCP (Di-n-cotyl pthalate)of grape test-tube plantlets of different in vit...