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KMID : 0379119960240010038
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Korean Journal of Mycology
1996 Volume.24 No. 1 p.38 ~ p.48
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Effects of Beneficial Microorganisms and Mycorrhizal Fungus Colonized Rhizoplane on the Suppression of Root Rot Pathogen , Fusarium solani
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김성호/Kim, Sung Ho
이상선/이민웅/한기돈/Lee, Sang Sun/Lee, Min Woong/Han, Ki Don
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Abstract
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The survival or colonization of beneficial organsisms and suppression of root rot of ginseng (Panax ginseng) by two distinct bacteria, Pseudamonas 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∼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 investigated in combination treatments by B. cereus or F. solani. The numbers of Fusarium spp. were colonized high number in rbizosphere soil from 3.33 to 3.67 (log cfu/g root) in control within 10∼60 days after treatment of pathogen F. solani, but it´s numbers were markedly decreased in 270 days cultivation of plant from 333 to 1.02 (log cfu/g root) alter treatment. 1n treatment of beneficial strains of P. cepacia and B. cereus, P. cepacia significantly suppressed the development of root rot from 43 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∼2.3) in combination of two bacteria was reduced in plants inoculated with both P, cepacia and B. cereus comparing to the index (43) of control. As an effect of inoculation with mycorrhiza on disease suppression, suppression of root rot by F. solani was reduced to 1.2∼1.6 in disease index in treatment of Glomus albidum and Acaulospora longular comparing to 43 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 43 of control in disease index respectively.
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KEYWORD
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Beneficial microorganism, Disease suppression, Root rot, Colonization, Mycorrhizae, P cepacia
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