马铃薯早疫链格孢菌（Alternalia solani）可诱导烟草对赤星病产生系统抗性

将从马铃薯上分离获得的Ａｌｔｅｒｎａｌｉａ　ｓｏｌａｎｉ菌株用０．５％的灭菌葡萄糖液配成浓度为１．０×１０５个孢子／毫升的孢悬液，用悬滴法诱导接种温室内８～９叶期ＮＣ８９烟草植株的第４、５片叶，１２天后用烟草赤星病菌对第２、３、６、７片叶进行挑战接种，结果表明，Ａｌｔｅｒｎａｌｉａ　ｓｏｌａｎｉ在一定条件下可诱导烟草植株对赤星病产生系统抗性，抗性诱导效应达８６％．此外，分离自白菜、油菜、葱和丁香上的４个Ａｌｔｅｒｎａｌｉａ　ｓｐｐ．菌株也可或多或少地诱导烟草植株对赤星病产生抗性．

SYSTEMIC RESISTANCE TO BROWN SPOT INDUCED IN TOBACCO BY PRIOR INOCULATION WITH AITERN ARIA SOLANI FROM POTATO

Conidial suspensions of Alternaria solani from potato (1.0 ×105 conidia per mililiter, in 0.5% of sterile glucose solutions) were prior droplet- inoculated on the surfaces of the forth and the fifth leaves of NC89 tobacco plants grown in greenhouse. After 12 days, the second,the third, the sixth and the seventh leaves were challenged with pathogen. It showed that Alternaria solani can induce systemic resistance to brown spot in tobacco and the protection was about 86%. In addition, systemic resistance to brown spot in tobacco can also be induced more or less by prior inoculation with four other isolates of Alternaria spp. (two from Brassica sp., one from Allium sp. and one from Syringa sp.).