Hyphal fusion in Magnaporthe grisea and the pathogenic variation of its progeny

Many fungi have hyphal fusion ability, including rice blast fungus Magnaporthe grisea( Hebert ) Barr nov. Comb, ( Anamorph Pyricularia oryzae Cavara)], and which is one of the major causes to pathogenic variation.Santo H has obserced the phenomenon of hyphal fusion in rice plant under electron rnieroscope and isolated some races which were different from parental ones.