Effects Of Nutrient In The Branches Of Grapevine And Change Of Endogenous Phytohormone On Cold Hardiness

Low temperature is one of the most important factors which could restrict the location and growth of the plants.Cold hardiness, which has a direct influence on north development of fruit trees, is among the most important characters.Grapevine is widely cultivated in Hebei Province, and whose cultivated area is in the second place around the country. But the development of grapevine, in some degree, is restricted because of frost damage.Cold hardiness is one of the most important stress resistance indexes.The cold hardiness of different kinds of grapevine has different genes which could induce different morphological structure and physiological stress resistance.It is significant to identify the cold hardiness character for usage, location, breeding, evaluation and extension of variety resources.gigantic peak, which was cultivated in northeast and middle of Hebei Province, was chosen as our experiment material. We measured the contents of soluble sugar and starch, the length and width of node in the one-year branches at the bottom, then observed the germination conditions after winter.The results showed that :1,Soluble sugar contents in different node from the northeast of Hebei Province were significantly higher than that from the middle of the province. They both showed the same tendency of starch contents.2,They showed difference between the length of the nodes. The length of the nodes from Chang-li showed an increasing tendency, while the length from Ding-zhou increased first and then showed an decreasing tendency.3,The thickness of the nodes from Chang-li and Ding-zhou both showed an decreasing tendency,while in the same node,the chickness from Chang-li were higher.4,In low-temperature exercise,along with cold resistance rising,plant endogenous ABA levels rising,the ABA levels of stronger cold hardness plants were hinger than weaker ones,so the content of ABA in winter bud from Chang-li was higher than that from Ding-zhou.5,Effects of different concentrations of exogenous abscisic acid,each time showed the difference of the abscisic acid content and abscisic acid change,presenting a weakened trend gradually as a whole.The different concentrations of abscisic acid and content in winter bud from Chang-li was higher than that from Ding-zhou every period.6,Under the condition of soil cold-resistant whithout winter buried,the rate of coldness of Chang-li vineyard plants was significantly below that of Ding-zhou vineyard plants,which showed the relationship of store nutrient in the one-year branch from Chang-li is higher than that from Ding-zhou.