| first and second line mechanisms of cadmium detoxification in the lichen photobiont trebouxia impressa (chlorophyta). | "first line" defence mechanisms, such as phytochelatin biosynthesis, and "second line" mechanisms, such as stress protein induction, were investigated in cadmium-exposed cells of trebouxia impressa ahmadjian, a green microalgal species that is a common photobiont of the lichen physcia adscendens (fr.) h. olivier. when t. impressa cells were exposed to 0, 9 and 18 microm cd for 6, 18 and 48 h, glutathione and phytochelatins efficiently protected the cells against cd damage. by contrast, the highe ... | 2008 | 17658203 |
| parasitic relationship between two culturally isolated and unrelated lichen components. | the presence of numerous haustoria, with accompanying death of the algal cells, was noted in a mixed cuture of the fungal symbiont (mycobiont) of collema tenax (sw.) ach., em. degel. and trebouxia impressa ahm., the algal partner (phycobiont) of physcia stellaris (l.) nyl. the parasitic action was noted even on media which would optimally sustain the independent growth of the individual symbionts. | 1959 | 17783006 |