The soil biotic community protects Rhododendron spp. across multiple clades from the oomycete Phytophthora cinnamomi at a cost to plant growth
The soil biotic community protects Rhododendron spp. across multiple clades from the oomycete Phytophthora cinnamomi at a cost to plant growth
复制标题
土壤生物群落保护杜鹃花属植物。
作者：
Yu Liu;J. Medeiros;J. H. Burns
整个土壤生物群落对植物的影响是一系列复杂的互利共生者和病原体正负相互作用的结果。然而，很少有实验评估整个土壤生物群落对植物生长和抗病性的综合影响。我们对 14 种杜鹃花进行了一项阶乘温室实验，这些杜鹃花在有或没有活同种土壤生物群以及有或没有肉桂疫霉病害的情况下生长。我们测试了整个土壤生物群落的存在会影响疾病存在下的生存的预测。我们还探索了整个系统发育中功能特征与疾病易感性的相关性。与无菌土壤相比，活土壤生物群的存在导致疾病存在下更高的存活率，并且这种效应的方向对于四个分支的七个物种是一致的。相对于在灭菌土壤中生长的植物，活土壤生物群的存在还显着降低了植物生长速率并降低了芽生物量，这表明活土壤生物群可能会影响植物分配策略。我们发现具有较高根冠比的杜鹃花品种不太容易受到疫霉属的影响，这表明水的关系会影响疾病的易感性。我们的研究结果表明，抗病性和易感性在多个进化枝中独立发生，并且整个土壤生物群落持续增强跨进化枝的抗病性，这表明土壤生物群可能在抗病性中发挥重要作用，并可以减轻疾病引起的死亡率。
The effects of whole soil biotic communities on plants is a result of positive and negative interactions from a complex suite of mutualists and pathogens. However, few experiments have evaluated the composite effects of whole soil biotic communities on plant growth and disease resistance. We conducted a factorial greenhouse experiment with 14 Rhododendron species grown with and without live conspecific soil biota and with and without the disease, Phytophthora cinnamomi. We tested the prediction that the presence of whole soil biotic communities influences survival in the presence of disease. We also explored functional trait correlations with disease susceptibility across the phylogeny. The presence of live soil biota led to higher survival in the presence of disease compared with sterilized soils, and the direction of this effect was consistent for seven species across four clades. The presence of live soil biota also significantly reduced plant growth rate and decreased shoot biomass, relative to plants grown in sterilized soil, indicating that live soil biota might influence plant allocation strategies. We found that Rhododendron species with higher Root Shoot Ratios were less susceptible to Phytophthora, suggesting that water relations influence disease susceptibility. Our findings that disease resistance and susceptibility occur independently across multiple clades and that whole soil biotic communities consistently enhance disease resistance across clades, suggest that soil biota may play an important role in disease resistance and can moderate disease-induced mortality.
DOI：
10.1073/pnas.1505765112
发表时间：
2015-09-08
影响因子：
11.1
作者：
Santhanam, Rakesh;Van Thi Luu;Baldwin, Ian T.
通讯作者：
Baldwin, Ian T.
影响因子：
10.5
作者：
Bever JD;Platt TG;Morton ER
通讯作者：
Morton ER