水杨酸诱导油茶抗炭疽病的研究

应用水杨酸溶液喷洒油茶叶片可有效诱导植株产生对炭疽病的局部性和系统性抗性.浓度150 mg·L-1诱导抗性效果最好,其对嫩叶的局部诱导病斑减小率为54.15%,对老叶的病斑减小率为61.55%.该浓度的水杨酸溶液喷洒对油茶炭疽病的系统性诱导抗性可使病斑减小率达46.7%;田间试验防治效果达到45.32%.水杨酸诱导油茶产生的局部性抗性可持续20 d而抗性水平无明显下降.扫描电镜显示在诱导处理的油茶叶片上,分生孢子能够萌发,但是芽管的生长受抑制,甚至异常变形卷曲.

Induced Resistance to Anthracnose of Camelia oleifera by Salicylic Acid

Local and systemic resistance to anthracnose of Camelia oleifera was induced when the plant was sprayed by salicylic acid solutions.The inducing effect was the strongest when the concentration of salicylic acid was 150 mg·L^-1,exhibiting 54.15% and 61.55% anthracnose inhibition rates on younger and elder leaves respectvively by local induction,and up to 46.7% inhibition rate by systemic induction.The maximum control rate of 45.32% was also attained in field experiment.The level of local induced resistance by salicylic acid had maintained 20 d without declining evidently.Under scanning electron microscope,the conidia germinated,but the growth of germ tubes was inhibited,and even malformed or twisted.