Jasmonic acid affects mycorrhization of spruce seedlings with Laccaria laccata |
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Authors: | M Regvar N Gogala N Žnidaršič |
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Institution: | (1) Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna Pot 111, Sl-1000 Ljubljana, Slovenia Fax: +386 (0) 61 273-390; e-mail: marjana.regvar@uni-lj.si, |
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Abstract: | Jasmonic acid (JA) was shown to be an important regulating molecule after wounding and pathogen attack, but it also conveys
mycorrhizal signalling. It was therefore applied to the ectomycorrhizal system. Root growth patterns of 2-month-old spruce
seedlings mycorrhized with Laccaria laccata after treatment with 0.5 μM JA, 5.0 μM JA, or none for the control, were studied using a paper-sandwich technique. Changes
in plant weight, root length, the degree of branching, presence of root hairs, and infection parameters were monitored for
26 days. Data were analysed by means of Student’s t-test and ANOVA factorial. Shoot and root dry weights were significantly increased by mycorrhizal infection, especially when
JA was applied. Lateral root formation and the presence of roots with hairs were dramatically decreased in the presence of
the fungus. A synergistic effect of JA and mycorrhization on decrease of lateral root length was shown. The first mycorrhizal
contact of fungal hyphae with roots was significantly accelerated after treatment with JA.
Received: 18 December 1996 / Accepted: 26 May 1997 |
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Keywords: | Ectomycorrhiza Jasmonic acid Picea abies Laccaria laccata Root growth |
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