β- 氨基丁酸诱导甜( 辣) 椒抗疫病作用的研究

 报道了用β- 氨基丁酸( DL-β-aminon-butyric acid, BABA) 喷雾处理辣椒叶片和茎后的诱导抗疫病作用。研究证明: 高浓度BABA ( 1 000 g/mL) 对离体辣椒疫霉病菌无抗菌活性, 用其喷雾处理辣椒的茎叶所诱导的抗疫病作用可完全控制其危害; 用BABA 诱导处理后3 d 接种辣椒疫霉病菌, 辣椒植株开始表达出较高的诱导抗性, 这种抗病作用可持续20 d 以上, 并表现出与数量抗病性相似的特性。

Induction of Resistance to Phytophthora capsici in Pepper Plants by DL-βamino-n-butyric acid

DL-β-aminon-butyric acid ( BABA) that was applied as a foliar spray to pepper plants induced resistance to a challenge infection with Phytophthora capsici . A relatively high concentration of BABA at 1 000 g/mL, which had no antifungal activity in vitro against P . capsici , was required to induce resistance against Phytophthora blight with a foliar and stem spray, thus leading to complete control of the disease. About 3 days intervalbetween BABA􀀁treatment and challenge inoculat ion was sufficient to induce resistance in pepper plants, and the in duced resistance could be retained more than 20 days after BABA􀀁treatment. High inoculum levels of P . capsicicaused Phytophthora development slowly in pepper foliar treated with BABA, especially at early plant growth stage, which suggests that the induced resistance in pepper plants may be more quantitative rather than qualitative.