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Effects of Mycorrhizal Inoculation on Plant Growth and N Metabolites in Relation to drought-stress Tolerance  

Lee, Bok-Rye (Department of Animal Science, College of Agriculture and Life Science, Chonnam National University)
Jung, Woo-Jin (Department of Animal Science, College of Agriculture and Life Science, Chonnam National University)
Kim, Dae-Hyun (Department of Animal Science, College of Agriculture and Life Science, Chonnam National University)
Kim, Kil-Yong (Department of Biological & Environmental Chemistry, College of Agriculture and Life Science, Chonnam National University)
Shon, Bo-Kyoon (Department of Agricultural chemistry, Sunchon National University)
Kim, Tae-Hwan (Department of Animal Science & Institute of Agriculture Science and Technology, Chonnam National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.35, no.5, 2002 , pp. 314-325 More about this Journal
Abstract
The effects of arbuscular mycorrhizal (AM) fungus (Glomus intraradices) on plant growth and N metabolic responses were examined in perennial ryegrass plants exposed to drought-stressed or well-watered condition. Mycorrhizal inoculation improved significantly leaf water potential, dry mass and P content. Drought stress increased significantly nitrate concentration in roots where the increase was much less in AM than non-AM. Drought stress decreased the concentration of soluble proteins in non-AM shoots, whereas non-significant decline occurred in AM shoots even under drought condition. The concentrations of ammonia and proline in drought stressed non-AM plants significantly increased, while mycorrhizal inoculation lowered significantly ammonia and proline accumulation. The decrease in leaf dry weight in drought stressed-plants was significantly correlated to the increase in ammonia (p<0.01) and proline concentration (p<0.01). These results suggested that the increased P content and N assimilation by mycorrhizal inoculation may be associated with drought stress tolerance, showing the moderating effects on shoot growth inhibition and ammonia accumulation in drought stressed-plants.
Keywords
Perennial ryegrass; Drought; Mycorrhizal inoculation; N metabolites;
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