Study on Inter-antagonism of Host Tree-inhabiting Bacterium Populations of Poplar Ice Nucleation Active(INA) Bacterial Canker Study on Biological Ice Nucleation and Its Applications ——Situation and Prospect Physiolog ica l and Biochem ica l Changes of PoplarInfected by Ice Nuclea tion Active Bacter ia l Canker D isea se ( Ⅱ) Dynamic changes of ice nucleation active bacterial population inhabiting on corn in Northern China Biological characteristics and frost-inciting mechanisms of ice nucleation active (INA) bacteria and the research in frost control Effect of Ice Nucleation Active Bacteria on the Ultrastructure of Apricot VarietiesOvule Effect of low temperature stress and INA bacteria on parameters of photosynthesis and chlorophyll fluorescence in loquat leaf Study on Endogenous Phytohormone Changes in Poplar Hosts Infected by Ice Nucleation Active Bacterial Canker Disease