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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front. Agric. China    2010, Vol. 4 Issue (1) : 79-83     DOI: 10.1007/s11703-009-0083-1
Research articles |
Effects of salicylic acid on the behavior of Yali pear infected by Alternaria kikuchiana Tanaka
Yongbo WANG,Yuxing ZHANG,Jianghong ZHANG,
College of Horticulture, Agricultural University of Hebei, Baoding 071001, China;
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Abstract  To investigate the inductive effect of salicylic acid (SA) on the resistance of Pyrus bretschneider cv Yali to black spot disease (Alternaria kikuchiana Tanaka), the physiological and biochemical characteristics of detached pear leaves at the age of 5 to 10 days were measured after application of SA. The results showed that exogenous SA significantly improved the resistance of Yali pear (Pyrus bretschneider cv Yali) leaves to black spot disease. For the SA treatment at 0.02mmol·L−1 SA concentration, the disease index was the lowest, and the induced resistance reached up to 63.9%. Furthermore, SA induced local and systemic resistance of Yali pear against the black spot disease. Expression of systemic resistance in leaves was detectable 3 d after SA treatments and lasted for 10 d. POD, PPO, and PAL activities of Yali pear leaves increased by SA treatment. It is suggested that exogenous SA solution as a chemical activator could induce the resistance of Yali pear to black spot disease.
Keywords Yali pear      Alternaria kikuchiana Tanaka      salicylic acid      induced resistance      
Issue Date: 05 March 2010
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