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Preliminary Effects of 4 Resistance Inducers on Tomato Resistance to Late Blight |
LI Shao-bo1,2,SHI Yan-xia2*,LIU Jun-li1,XIE Xue-wen2,LI Bao-ju2* |
1Shenyang Agricultural University, Shenyang 110866, Liaoning, China; 2Institute of Vegetables and Flowers,Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract In order to identify the resistance of tomato to late blight( Phytophthora infestans)induced by benzothiadiazole,lentinan,chitosan and amino-oligosaccharin,this study determined the bacteriostatic activity of the above 4 elicitors.The results showed that these 4 elicitors had no significant bactericidal activity,and their inhibitory effects were generally less than 30%. The results of pot experiment indicated that the effects of induced resistance of these 4 elicitors with different concentrations against tomato in seedling stage were good.Among them,2% chitosan( AS) at concentration of 500 mg·L-1 was 90.06%,which has the best control efficiency.The results of field experiment indicated that the effects of induced resistance of these 4 elicitors with different concentrations against tomato late blight in adult-plant stage were over 70%( except the treatment of 2% chitosan AS at concentration of 125 mg·L-1).The better treatments were 1% benzothiadiazole( EW)at concentration of 50 mg·L-1 and 3% amino-oligosaccharin AS at concentration of 100 mg·L-1.Their control efficiencies were 94.71% and 95.89%,respectively.
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Received: 16 March 2013
Published: 20 April 2013
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