Incidence of Venturia shoot blight in aspen (Populus tremuloides Michx.) varies with tree chemistry and genotype
Incidence of Venturia shoot blight in aspen (Populus tremuloides Michx.) varies with tree chemistry and genotype
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DOI：
10.1016/j.bse.2009.02.003
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发表时间：
2009-07-01
影响因子：
1.6
通讯作者：
Lindroth, Richard L.
中科院分区：
文献类型：
--
作者：
Holeski, Liza M.;Vogelzang, Andrew;Lindroth, Richard L.
颤杨（Populus tremuloides）是北美森林的基础树种，也是木材和纸制品的宝贵来源。颤山杨在自然种群内部和种群之间的植物化学成分中表现出巨大的遗传变异，影响与食草动物的相互作用和生态系统动态。然而，这些植物化学物质与抗病性的潜在关联尚不清楚。在这里，我们展示了在普通花园中感染枝枯病（Venturia moreletii）的颤木基因型的“自然实验”的结果。我们发现，白杨基因型之间枝枯病的发生率相差 10 倍，并且与叶面浓缩单宁浓度呈强烈负相关。因此，塑造白杨种群遗传和植物化学结构的选择因素可能会同时影响白杨对病原体攻击的抵抗力，通过“扩展表型”效应对个体树木的适应性和群落组织产生影响。 (C) 2009 Elsevier Ltd. 保留所有权利。
Quaking aspen (Populus tremuloides) is a foundation tree species in North American forests, as well as a valuable source of wood and paper products. Quaking aspen exhibits substantial genetic variation within and among natural populations in phytochemical compounds that influence both interactions with herbivores and ecosystem dynamics. The potential association of these phytochemicals with disease resistance, however, is unknown. Here we present the results of a "natural experiment" in a common garden of quaking aspen genotypes infected with shoot blight (Venturia moreletii). We found that the incidence of shoot blight varied by 10-fold among aspen genotypes, and was strongly and negatively correlated with constitutive foliar concentrations of condensed tannins. Selection factors that shape the genetic and phytochemical architecture of aspen populations may thus Simultaneously influence aspen resistance to pathogen attack, with consequences for individual tree fitness as well as community organization, via "extended phenotype" effects. (C) 2009 Elsevier Ltd. All rights reserved.