Mutants Resistant to Barley Yellow Mosaic Virus (BaYMV) Created by Mutagenesis Combined With Microspore Culture Ultrastructural Studies of Barley Mesophyll Cella lnfected with Barley Yellow Mosaic Viruses DISTRIBUTION OF FUNGAL-TRANSMITTED BARLEY AND WHEAT VIRUSES IN CHINA THE DETECTION OF BARLEY YELLOW MOSAIC VIRUS WITH MONOCLONAL ANTIBODY OF BaYMV THE RESISTANCE AND SUSCEPTIBILITY REACTIONS OF BARLEY VARIETIES OF JAPAN AND WEST-EUROPE TO CHINESE BARLEY YELLOW MOSAIC VIRUS (BaYMV)