Effect of Salicylic Acid and Triazolone on Photosynthetic Properties of Eucommia ulmoides under Water Logging Stress

2-year Eucommia ulmoides seedlings from nursery in Tianmu, Zhejiang province were treated by normal growth (A), water logging + water spraying (B), water logging + salicylic acid spraying (C), water logging + triazolone spraying (D) in 2012. The result demonstrated that seedlings under water logging had symptoms of leaf spot leaf loss, 2 seedlings (B) even died 25 days later. Seedling of C and D had better growth, but that of D had evident dwarfing effect. The experiment showed that seedlings with salicylic acid and triazolone treatment had higher net photosynthetic rate and FV/Fm.