One of the most important diseases affecting potato is late blight, caused by the oomycete Phtytophthora infestans. The use of jasmonic acid has been reported to reduce the progression of the disease in potato, but the defense mechanisms involved in this response are unknown. In this study we described the effect of jasmonic acid as a priming agent over time in the defense response of potato against the invasion of P. infestans. We observed that the initial stimulus generated by the exogenous application of jasmonic acid had an effect on the stomatal conductance of the treated tissue and activated StMYC2 expression. Results reveal a priming effect in plants inoculated 11 days after treatment with jasmonic acid, evidenced by an increased transcriptional induction of defense-associated genes, decrease in the number of necrotic lesions and an evident reduction of lesion area (72.23%). Furthermore, in this study, we show that the tested concentration of jasmonic acid does not have an adverse effect at the physiological level in plants, since variation in stomatal conductance was transient, no change in chlorophyll a fluorescence and no early senescence in leaves was observed.

影响马铃薯的最重要病害之一是晚疫病，由卵菌疫霉疫霉引起。据报道，茉莉酸的使用可以减少马铃薯疾病的进展，但这种反应所涉及的防御机制尚不清楚。在这项研究中，我们描述了茉莉酸作为引发剂在马铃薯抵御致病疫霉入侵的防御反应中随时间推移的作用。我们观察到，外源性应用茉莉酸产生的初始刺激对处理组织的气孔导度有影响，并激活了StMYC2表达。结果显示，在用茉莉酸处理后 11 天接种的植物中具有引发效应，这可以通过防御相关基因的转录诱导增加、坏死病变数量减少和病变面积明显减少 (72.23%) 来证明。此外，在这项研究中，我们表明茉莉酸的测试浓度在植物生理水平上没有不利影响，因为气孔导度的变化是短暂的，叶绿素a荧光没有变化，也没有观察到叶子的早期衰老.