论文部分内容阅读
硝酸镍溶液喷施处理后 ,水稻幼苗的白叶枯病发病程度降低 .经平板测定 ,硝酸镍对稻白叶枯菌只有轻微的直接毒性 ,表明水稻幼苗白叶枯病病情减弱 ,主要由于硝酸镍诱导了水稻幼苗对白叶枯病的抗性 .0 .0 5～2 .75 mmol/ L的硝酸镍均有明显的诱抗作用 ,其中 2 .2 m mol/ L为最佳诱导浓度 .2 .2 m mol/ L硝酸镍喷施处理后 ,水稻幼苗叶片病斑长比对照降低了 6 9.6 % .处理后第 3d水稻幼苗表现出最大的诱导抗性 .用 2 .2 mm ol/ L喷雾处理第 3叶以下部位 ,第 4d挑战接种第 3叶 ,使第 3叶产生了对白叶枯病的系统抗性 ,相对诱导效果达 42 .9% .硝酸镍的诱导抗病作用持续 2 1 d左右
The results showed that there was only slight direct toxicity of nickel nitrate to the rice leaf blight after the spraying of the nickel nitrate solution, indicating that the disease severity of the rice leaf blight was weakened, mainly due to the nitric acid Nickel induced the resistance of rice seedlings to bacterial leaf blight.E0.50 ~ 2.75 mmol / L of nickel nitrate showed obvious anti-inductive effects, of which 2. 2 m mol / L was the best concentration.2 After treated with 2 m mol / L nickel nitrate, the lesion length of rice seedling leaves was decreased by 6 9.6% compared with the control, and the maximum induction resistance was observed on the 3rd day after treatment. With a spray of 2.2 mmol / L In the third leaf, the third leaf was challenged on the 4th day to make systemic resistance to the third leaf, the relative induction rate was 42.9% .The anti-disease effect of nickel nitrate persisted for 21 days about