초록

유용 미생물로 선발한 Pseudomonas cepacia, Bacillus cereus 및 균근균을 인삼(Panax ginseng)근권에 처리한 후 이들 미생물들의 근권내 정착 및 근부병의 발생억제에 미치는 영향을 폿트 배양으로 실험하였다. P. cepacia의 단독 처리에서 처리 10일후에 근권에서 조사된 세균수는 6.26 (log cfu/g.soil)이나 B. cereus 등과 혼합 처리한 경우 $5.25{\sim}6.19(log\;cfu/g.soil)$으로 분포수가 적었고 처리기간이 270일 후에는 3.01 (log cfu/g. soil)으로 크게 감소하였다. Fusarium spp.의 근권내 분포수는 처리 $10{\sim}60$일 후에는 $3.33{\sim}3.67(log\;cfu/g.soil)$이었으나 처리 270일 경과 후에는 $3.33{\sim}1.02(log\;cfu/g.soil)$으로 크게 감소되었다. 근부병발생율에 있어서 대조가 4.3의 이병지수를 나타내나 P. cepacia 처리는 1.2로 발생이 크게 억제되었다. P. cepacia와 B. cereus의 혼합처리는 $1.8{\sim}2.3$의 이병지수로 대조 4.3보다는 병발생율이 낮아졌다. 균근균으로 Glomus albidum과 Acaulospora longular 처리는 병발생율 $1.2{\sim}1.6$으로 대조 4.3보다 감소하였다. 세균으로 P.cepacia와 균근균으로 G. albidum 처리는 근부율을 각각 1.2로 낮추는 발병억제 효과가 있다.

Abstract

The survival or colonization of beneficial organsisms and suppression of root rot of ginseng (Panax ginseng) by two distinct bacteria, Pseudomonas cepacia, Bacillus cereus and three mycorrhiza in pot soil were investigated and compared with uninoculated root. In separate inoculation, colonization of roots by P. cepacia was maintained at 6.25 (log cfu/g root) during growth for 10 days under pot culture conditions comparing to $5.62{\sim}6.19$ by mixed treatment with other organisms. Colonizations of P. cepacia were gradually decreased from 6.25 (log cfu/g root) in 10 days growth to 3.01 (log cfu/g root) in 270 days incubation period. This reduction was also investgated in combination treatments by B. cereus or F. solani. The numbers of Fusarium spp. were colonized high number in rhizosphere soil from 3.33 to 3.67 (log cfu/g root) in control within $10{\sim}60$days after treatment of pathogen F. solani, but it's numbers were markedly decreased in 270 days cultivation of plant from 3.33 to 1.02 (log cfu/g root) after treatment. In treatment of beneficial strains of P. cepacia and B. cereus, P. cepacia significantly suppressed the development of root rot from 4.3 in control to 1.2 in treatment, whereas B. cereus alone had no effect on the rate of disease suppression. The disease index $(1.8{\sim}2.3)$ in combination of two bacteria was reduced in plants inoculated with both P. cepacia and B. cereus comparing to the index (4.3) of control. As an effect of inoculation with mycorrhiza on disease suppression, suppression of root rot by F. solani was reduced to $1.2{\sim}1.6$ in disease index in treatment of Glomus albidum and Acaulospora longular comparing to 4.3 of control. In the treatment of bacterial strain P. cepacia and mycorrhizal fungus Glomus albidum, the disease suppression was apparent to 1.2 and 1.2 comparing to 4.3 of control in disease index respectively.

주제어

#Beneficial microorganism   #Disease suppression   #Root rot   #Colonization   #Mycorrhizae   #P   #cepacia  

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