Growth of mycorrhizal tomato and mineral acquisition under salt stress |
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Authors: | G N Al-Karaki |
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Institution: | (1) Department of Plant Production, Faculty of Agriculture, Jordan University of Science and Technology, P.O. Box 3030, Irbid, Jordan e-mail: gkaraki@just.edu.jo, JO |
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Abstract: | High salt levels in soil and water can limit agricultural production and land development in arid and semiarid regions. Arbuscular
mycorrhizal fungi (AMF) have been shown to decrease plant yield losses in saline soils. The objective of this study was to
examine the growth and mineral acquisition responses of greenhouse-grown tomato to colonization by the AMF Glomus mosseae (Nicol. And Gerd.) Gerd. and Trappe] under varied levels of salt. NaCl was added to soil in the irrigation water to give
an ECe of 1.4 (control), 4.7 (medium) and 7.4 dS m–1 (high salt stress). Plants were grown in a sterilized, low P (silty clay) soil-sand mix. Mycorrhizal colonization was higher
in the control than in saline soil conditions. Shoot and root dry matter yields and leaf area were higher in mycorrhizal than
in nonmycorrhizal plants. Total accumulation of P, Zn, Cu, and Fe was higher in mycorrhizal than in nonmycorrhizal plants
under both control and medium salt stress conditions. Shoot Na concentrations were lower in mycorrhizal than in nonmycorrhizal
plants grown under saline soil conditions. The improved growth and nutrient acquisition in tomato demonstrate the potential
of AMF colonization for protecting plants against salt stress in arid and semiarid areas.
Accepted: 21 February 2000 |
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Keywords: | Growth Lycopersicon esculentum Mineral acquisition Mycorrhiza Salinity |
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