Lioussanne L, Jolicoeur M, St-Arnaud M
Institut de recherche en biologie végétale, Université de Montréal & Jardin botanique de Montréal, 4101 East Sherbrooke Street, Montreal, QC, H1X 2B2, Canada.
Bio-P2 Research Unit, Department of Chemical Engineering, École Polytechnique de Montréal, P.O. Box 6079, Centre-ville Station, Montreal, QC, H3C 3A7, Canada.
Mycorrhiza. 2009 Aug;19(6):443-448. doi: 10.1007/s00572-009-0257-y. Epub 2009 Jun 2.
We studied the role of modification in root exudation induced by colonization with Glomus intraradices and Glomus mosseae in the growth of Phytophthora nicotianae in tomato roots. Plants were grown in a compartmentalized plant growth system and were either inoculated with the AM fungi or received exudates from mycorrhizal plants, with the corresponding controls. Three weeks after planting, the plants were inoculated or not with P. nicotianae growing from an adjacent compartment. At harvest, P. nicotianae biomass was significantly reduced in roots colonized with G. intraradices or G. mosseae in comparison to non-colonized roots. Conversely, pathogen biomass was similar in non-colonized roots supplied with exudates collected from mycorrhizal or non-mycorrhizal roots, or with water. We cannot rule out that a mycorrhiza-mediated modification in root exudation may take place, but our results did not support that a change in pathogen chemotactic responses to host root exudates may be involved in the inhibition of P. nicotianae.
我们研究了根内球囊霉和摩西球囊霉定殖诱导的根系分泌物修饰在番茄根中烟草疫霉生长过程中的作用。植物种植于分隔式植物生长系统中，分别接种丛枝菌根真菌或接受来自菌根植物的分泌物，并设置相应对照。种植三周后，植物接种或不接种来自相邻隔室生长的烟草疫霉。收获时，与未定殖的根相比，被根内球囊霉或摩西球囊霉定殖的根中烟草疫霉的生物量显著降低。相反，在供应有从菌根或非菌根根收集的分泌物或水的未定殖根中，病原菌生物量相似。我们不能排除可能发生了菌根介导的根系分泌物修饰，但我们的结果不支持病原菌对宿主根分泌物的趋化反应变化可能参与了对烟草疫霉的抑制作用。
