Plant-Soil Feedbacks of Plantago lanceolata in the Field Depend on Plant Origin and Herbivory
Plant-Soil Feedbacks of Plantago lanceolata in the Field Depend on Plant Origin and Herbivory
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DOI：
10.3389/fevo.2019.00422
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发表时间：
2019-11
影响因子：
3
通讯作者：
L. Kirchhoff;Anna Kirschbaum;J. Joshi;O. Bossdorf;J. F. Scheepens;J. Heinze
中科院分区：
文献类型：
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作者：
L. Kirchhoff;Anna Kirschbaum;J. Joshi;O. Bossdorf;J. F. Scheepens;J. Heinze
参与植物-土壤反馈（PSFs）的土壤生物对植物个体的生长有影响。到目前为止，研究土壤生物群介导的植物生长因子在植物性能中的作用主要是在温室中进行的，主要集中在物种差异，而在田间条件下的植物生长因子对植物性能的贡献和植物种群中的种内变异仍然很少调查。在这里，我们进行了PSF盆栽实验在田间条件下，研究种内变异植物对土壤生物区系的反应。我们使用了来自多个种子科的车前（Plantago lanceolata L.）以及来自对比栖息地（三个未施肥牧场与三个施肥的割过的牧场）的Plastio调理土壤，以测试植物对其亲本土壤生物群是否表现出积极或消极的反应。我们还测试了这些PSF是否依赖于小气候和昆虫植食性。为此，我们将植物及其土壤生物群分别移植到两种生境类型之间，并分别从一半的植物中排除地上食草动物。当生长没有食草动物，植物从两个栖息地类型表现出类似的和中性的PSF独立的移植网站。相比之下，在存在食草动物的情况下，来自未施肥牧场的植物的PSF在两种生境中均为阴性（即植物在与外来土壤生物群一起生长时表现更好），而来自施肥割草牧场的植物的PSF保持中性。我们的研究结果表明，土壤生物群单独可能只发挥次要作用的性能披针叶和土壤生物群介导的PSFs的结果是由在不同的生境中的草食动物的影响调制。
Soil biota involved in plant-soil feedbacks (PSFs) have an impact on the growth of plant individuals. So far, studies investigating the role of soil-biota mediated PSFs in plant performance were mostly performed in greenhouses and focused predominantly on species differences, whereas the contribution of PSFs to plant performance under field conditions and intraspecific variation in PSFs among plant populations remain poorly investigated. Here, we performed a PSF pot experiment under field conditions to study intraspecific variation in plant responses to soil biota. We used seeds from multiple seed families of Plantago lanceolata L. together with Plantago-conditioned soils from contrasting habitats (three non-fertilized pastures vs. three fertilized mown pastures) to test whether plants show a positive or negative response to their parental soil biota. We furthermore tested whether these PSFs depend on microclimate and insect herbivory. To this end, we reciprocally transplanted plants and their soil biota between the two habitat types and excluded aboveground herbivores from half of the plants, respectively. When grown without herbivores, plants from both habitat types showed similar and neutral PSFs independently of the transplant site. In contrast, in the presence of herbivores, PSFs for plants from non-fertilized pastures were negative in both habitats (i.e. plants performed better when they grew with foreign soil biota), whereas PSFs for plants from fertilized mown-pastures remained neutral. Our results suggest that soil biota alone might only play a minor role for performance of P. lanceolata and that the outcome of soil-biota mediated PSFs is modulated by effects of herbivores in different habitats.