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| The Effects of Adding secondary metabolites of Aspergillus niger on Desease Resistance to Root-knot Nematode of Tomato |
| LI Song1，DUAN Yu-xi1， ZHU Xiao-feng1，CHEN Li-jie1，WANG Yuan-yuan2 |
| 1College of Plant Protection， Northern China Institute of Nematology，Shenyang Agricultural University , 2Biological Science and Technology，Shenyang Agricultural University ,Shenyang ，110866, China |
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Abstract In order to define the secondary metabolites of Aspergillus niger. to tomatoes root-knot nematode (Meloidogyne incognita.) disease prevention effect and the change of defense enzyme activity ,application of various concentrations of secondary metabolites of A niger. to root-knot nematode disease in tomato were studied in greenhouse. And the research on effects of secondary metabolites on several defense enzymes in tomato was investigated. The results showed that the secondary metabolites of A. niger. reduced the root-knot index and nematode populations，meanwhile promoted tomato plant growth compared with untreated control. The activities of defense enzymes enhanced significantly, such as phenylalanine ammonia (PAL), polyphenol oxidas (PPO), peroxidase (POD), superoxide (SOD) and catalase (CAT). It indicated that the secondary metabolites of A. niger. could markedly induce the resistance of tomato to root-knot nematode and have great potential in biocontrol.
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Received: 02 November 2010
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