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KMID : 0880220130510010100
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Journal of Microbiology
2013 Volume.51 No. 1 p.100 ~ p.104
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Expression analysis of LeNHX1 gene in mycorrhizal tomato under salt stress
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ZhongQun He
Zhi Huang
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Abstract
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The plant growth, stem sap flow, Na+ and Cl? content, and the expression of vacuolar Na+/H+ antiporter gene (LeNHX1) in the leaves and roots of tomato under different NaCl stresses (0.5% and 1%) were studied to analyze the effect of arbuscular mycorrhizal fungi (AMF) on Na+ and Cl? accumulation and ion exchange. The results showed that arbuscular mycorrhizal (AM) plant growth and stem sap flow increased and salt tolerance improved, whereas Na+ and Cl? accumulated. Na+ significantly decreased, and no significant decline was detected in Cl? content after AMF inoculation compared with the non-AM plants. The LeNHX1 gene expression was induced in the AM and non-AM plants by NaCl stress. However, AMF did not improve the LeNHX1 level, and low expression was observed in the AM tomato. Hence, the mechanism that reduced the Na+ damage to tomato induced by AMF has little relation to LeNHX1, which can export Na+ from the cytosol to the vacuole across the tonoplast.
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KEYWORD
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arbuscular mycorrhizal fungi, salt stress, Na+ and Cl? accumulation, Na+/H+ antiporter
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