稲品種群の馬鹿苗病抵抗性 : 稲の病理育種学的研究V

Abstract

In order to clarify of tendehcy of the varietal resistance of riqe to the ' bakanae ' disease (Gibberella Fujikuroi (SAW.) WR.), the author studied the resistance of the different varieties with almost two hundreds. native in the different latitudinal r.egions in Asia. In the first time, some preliminary experi-ments Were undertaken on the reaction of rice varieties to the different strains of the fungus as well as different methods of inoculation . ' S0. far as the four strains of the causal fungus employed in the :present exptrirnents are con.cerned, the reactions of several different varieties ta these different strains were almost parallel . The varietal reactions to the different methods of inoculation were as follows. ( 1 ) When the sterilized seeds were immersed in the conidial suspension just before sowing for inspecting the resistance of the germinated seedlings to the ihvasion of the fungus, the varietal difference resulted as the different grades of abnormal elongation and blight of the seedlings. ( ) When the plants at the tillering stage were injected with the conidial ' slspension in the basal part bf stems in order ta insp6ct the resistance of the internal tissue of plants, the different varieties showed the different grades of abnormal elongation and blight followed by mouldiness due to sporodochia formation.' ( 3 ) In the case of spraying with conidial suspen-sion on the panicles at one day after blooming in ordef to know the difference of resistance of the yo -ung lernma and palea to the invasion of the fngus, varietal difference resulted as the grade of discolora -tion and mouldniess of the grains. B iochemical Jour. Imp.