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STUDY OF COLD HARDINESS IN THE WILD VITIS NATIVE TO CHINA

He puchao, Niu Lixin ( The Northwestern Agricultural University, YangLing, Shannxi )  
Cold hardiness of 17 wild Vitis species native to China,including 38 clones, was assessed by growth, tissue browing and electrolitic conduc-tance methods. The results showed that the cold hardiness of V. amurensis,V. yeshanensis and V. adstricta were very hardy. V. bryoniifolia, V.hancockii, V.pseudoreticulata. V.piasezkii, and V.quinquangularis were hardy in cold hardinss. V. romanetii, V. wilsonae, V. adstricta var. ter-nata, V. dauidii, V. davidii var. cyanocarpa, Maihuang-grape(V.ssp), Qinba wild grape(V.ssp) and V, betulifolia were tender. Which were about the same as V, vinifera in cold hardiness. The cold hardiness of V. flexuosa were very tender. It also was found that the freezing resis-tance differences of grape intraspecific were closely related to climatic variation pattern of the distribution area. In general, grapes from cold regions were hardier in cold hardiness than those from warm regions.
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