Department of Plant Science, University of Manitoba, Winnipeg, Canada.
Plant Physiol Biochem. 2012 Aug;57:8-14. doi: 10.1016/j.plaphy.2012.04.013. Epub 2012 May 3.
Phytophthora infestans is the cause of late blight, a devastating disease in potato and tomato. Many of the mechanisms underlying P. infestans pathogenesis and defense responses in potato are still unclear. We investigated the effects of P. infestans on the changes in the accumulation of secondary metabolites in potato cultivars using whole plants. Four preformed flavonoids and one terpenoid compound produced in potato tissues were differentially affected by the P. infestans inoculation. In Russet Burbank, the accumulation of catechin and rutin was suppressed by both P. infestans isolates US-11 and US-8, while the flavanone P3 was associated with susceptibility to this pathogen. On the other hand, catechin, flavonol-glycoside P2, and an unidentified terpenoid (T1), may be involved in the defense of cultivar Defender to both tested P. infestans isolates, providing new evidence that different preformed flavonoids and terpenoids in potato may play important roles in its defense or susceptibility to P. infestans. These results add to the pool of data showing the involvement of other phenolics and terpenes in potato resistance to microbial pathogens.
致病疫霉是晚疫病的病原体，会对马铃薯和番茄造成毁灭性影响。许多与马铃薯中致病疫霉发病机制和防御反应相关的机制仍不清楚。我们使用整株植物研究了致病疫霉对马铃薯品种中次生代谢物积累变化的影响。在马铃薯组织中产生的 4 种预形成类黄酮和 1 种萜烯化合物受到致病疫霉接种的不同影响。在 Russet Burbank 中，两种致病疫霉分离株 US-11 和 US-8 均抑制了儿茶素和芦丁的积累，而黄烷酮 P3 与该病原体的易感性相关。另一方面，儿茶素、黄酮醇糖苷 P2 和一种未鉴定的萜烯（T1）可能参与了对两种测试的致病疫霉分离株的防御，为不同的预形成类黄酮和萜烯在马铃薯防御或易感性方面可能发挥重要作用提供了新证据。这些结果增加了数据的积累，表明其他酚类化合物和萜烯类化合物在马铃薯抵抗微生物病原体方面的作用。
