Rhizoctonia solani AG2-2菌体の繰り返し接種によって誘導された抑止土壌の微生物的特性
Some microbial properties of suppressive soil induced by successive inoculations of Rhizoctonia solani anastomosis group 2-2

Mitsuru Sayama, Yoshihisa Homma, Hiromitsu Furuya, Shigehito Takenaka
2001 Tsuchi to biseibutsu  
is necessary to app ] y living mycelium of R . solani intQ the soil for supPressiveness but cultivatioll of sugar beet is not a ユ ways rlecessary . Growth rate of myce ! iurn of R . solani in the suppressive soil was reduced to abQut one ・ half of that in the natura ! ly cultivated soil after 5 days of incubatiorl. No correlation was detected between the suppressiveness of the soil and the population of tota ! fungi , bacteria , actinomycetes and 7 一 痂 ん04 召7彫 召 spp . in the soil, However , the
more » ... soil, However , the suppressiveness was enhanced by incubation of llatural soil mixed with living 」配 . solani Inycelium and a small amount of suppressive soil . This fact indicated that microorganisms parasi 亡 ic to R . solani may be involved in the supPressiveness . Suppressiveness was eliminated by aerated steam treatmen 亡 at 55℃ for 30 minutes , jndica 亡 ing that heat ・ resistant bacteria are not セ he major supPressive factors , The suppressive factor was not sensitive to benolnyl mixed in soil , although members of T π ' choderma , G ! iocladiitm and Verticilgiztm , which are well known to be parasitic to R . solani , were sensitive to benomyl 、 These results suggest that heat ・ sensitive and benomyl − tolerant microorganisms are the main factors for the suppressive soil .
doi:10.18946/jssm.55.1_37 fatcat:lyiirteymfb3zlc4u4gih5aiie