Bonello Pierluigi, Storer Andrew J, Gordon Thomas R, Wood David L, Heller Werner
Department of Plant Pathology, 1 Shields Ave, University of California, Davis, California 95616, USA.
J Chem Ecol. 2003 May;29(5):1167-82. doi: 10.1023/a:1023833707382.
Concentrations of soluble phenolics and lignin in the phloem of ponderosa pines inoculated with the pathogen Heterobasidion annosum were assessed over a period of 2 years in a 35-year-old plantation in northern California, USA. The major effect of the pathogen on phloem-soluble phenolics consisted of a significant accumulation of ferulic acid glucoside: 503 +/- 27 microg/g fresh weight (FW), compared with 366 +/- 26 microg/g FW for mock-treated and 386 +/- 27 microg/g FW for control trees. Lignin content was negatively correlated with ferulic acid glucoside concentration, and there was an indication of lignin reduction in the cell walls of inoculated trees. Lignin had a negative effect on the in vitro growth of two common bark beetle fungal associates. Ceratocystiopsis brevicomi and Ophiostoma minus. For this reason it, is hypothesized that lower lignification may facilitate the growth of beetle-associated fungi, resulting in greater susceptibility of the presymptomatic host to bark beetle colonization.
在美国加利福尼亚州北部一个35年树龄的人工林中，对感染病原菌异担子菌的黄松韧皮部中可溶性酚类物质和木质素的浓度进行了为期两年的评估。病原菌对韧皮部可溶性酚类物质的主要影响是阿魏酸葡萄糖苷显著积累：503±27微克/克鲜重（FW），相比之下，模拟处理的为366±26微克/克FW，对照树为386±27微克/克FW。木质素含量与阿魏酸葡萄糖苷浓度呈负相关，并且有迹象表明接种树木细胞壁中的木质素减少。木质素对两种常见的树皮甲虫真菌共生体短孢角囊菌和微小长喙壳菌的体外生长有负面影响。因此，据推测较低的木质化程度可能会促进与甲虫相关真菌的生长，导致无症状宿主对树皮甲虫定殖的易感性增加。
