植物茉莉酸含量与抗病抗虫性密切相关，为了筛选抗蚜烟草品种，并研究其抗蚜机制，采用离体叶片试验和盆栽试验，从烟蚜选择性和繁殖特性两方面对12个烟草品种进行了抗蚜性鉴定，并分析其接种蚜虫前后烟株茉莉酸含量变化。结果表明，茄棵、胎里肥2411、竖把老母鸡2113和王坡二4个烟草品种表现为抗蚜，务川黑烟、红县乡大叶烟、MC Nair和Vesta 33四个品种对蚜虫表现为中抗，中烟100和SpeightG-28两个品种表现为感蚜，螺丝头2474和云烟97两个品种表现为高感；抗蚜烟草品种茉莉酸含量均极显著高于其他品种；参试12个烟草品种在蚜虫侵袭后茉莉酸含量均极显著增加，且抗蚜烟草品种茉莉酸增加量和增幅均大于感蚜烟草品种。因此，烟草茉莉酸含量与抗蚜性有较好的相关性，可以作为烟草品种抗蚜鉴定的生理指标。

Jasmonic acid(JA) is closely related to plant disease resistance and insect resistance.In order to select aphid resistant tobacco varieties and study its mechanism,leaf test in vitro and pot experiment were used to identify the aphid resistance of 12 tobacco varieties,and the changes of JA content before and after aphids infestation were analyzed.The results showed that four tobacco varieties,such as Qieke,Tailifei 2411, Shubalaomuji 2113 and Wangpoer showed resistance to aphid; the aphid resistance of Wuchuanheiyan,Hongxianxiangdayeyan, MC Nair and Vesta 33 were moderate; Zhongyan 100 and SpeightG-28 were susceptible to aphid; the Luositou 2474 and Yunyan 97 showed high sensitivity to aphid.The content of endogenous JA in aphid resistant tobacco varieties was significantly higher than that in other varieties.The content of JA increased significantly in 12 tobacco varieties after aphid infestation.The increase amount and increase range of JA in aphid resistant tobacco varieties were greater than those in aphid susceptible tobacco varieties.JA content had a good correlation with aphid resistance,which could be used as a physiological index for identification of aphid resistance in tobacco varieties.