SOURCES OF MYCORRHIZAL INFECTION OF SHOREA ACUMINATA SEEDLINGS UNDER LABORATORY CONDITIONS*)
AbstractUninoculated dipterocarp seedlings raised in normal field soil in nurseries were always found to have mycorrhizas after a few months. This study set out to determine whether dipterocarp seedlings could continue to grow and develop in the absence of mycorrhizas and also to determine possible sources of mycorrhizal infection ofÂ dipterocarpÂ seedlingsÂ raisedÂ underÂ laboratoryÂ conditionsÂ usingÂ ShoreaÂ acuminataÂ asÂ aÂ typicalÂ example. Seedlings were planted in capped or uncapped perspex boxes containingÂ sterile or non-sterileÂ field soil and wateredÂ dailyÂ withÂ sterileÂ waterÂ orÂ tapÂ water.Â SeedlingÂ growthÂ andÂ developmentÂ ofÂ mycorrhizasÂ were monitored at monthly intervals for up to seven months. Seedlings grown in sterile soil remained uninfected after seven months while infection was found in some of the seedlings grown in normal soil regardless of whether they had been watered with tap water or sterile water. This showed that field soil (i.e. under grass) far from the forest contained suitable inoculum for forest tree seedlings. Tap water and the air were not important sources of infection. However, mycorrhizalÂ infection wasÂ veryÂ unevenÂ indicatingÂ thatÂ theÂ inoculum wasÂ probablyÂ veryÂ unevenly distributed in the soil or that the inoculum density was rather low. Seedlings grown in sterile soil showed better growthÂ thanÂ thoseÂ grownÂ inÂ normalÂ soilÂ andÂ infectionÂ ofÂ rootsÂ byÂ parasiticÂ fungiÂ inÂ theÂ latter wasÂ also observed.Key words:Â Â Â Mycorrhizas/Plant pathology/lnfections/ShoreaÂ acuminata/Seedlings.
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