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首页> 美国卫生研究院文献>Frontiers in Microbiology >Root exudation and root development of lettuce (Lactuca sativa L. cv. Tizian) as affected by different soils
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Root exudation and root development of lettuce (Lactuca sativa L. cv. Tizian) as affected by different soils

机译：不同土壤对莴苣根系分泌和根系发育的影响

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Development and activity of plant roots exhibit high adaptive variability. Although it is well-documented, that physicochemical soil properties can strongly influence root morphology and root exudation, particularly under field conditions, a comparative assessment is complicated by the impact of additional factors, such as climate and cropping history. To overcome these limitations, in this study, field soils originating from an unique experimental plot system with three different soil types, which were stored at the same field site for 10 years and exposed to the same agricultural management practice, were used for an investigation on effects of soil type on root development and root exudation. Lettuce (Lactuca sativa L. cv. Tizian) was grown as a model plant under controlled environmental conditions in a minirhizotrone system equipped with root observation windows (rhizoboxes). Root exudates were collected by placing sorption filters onto the root surface followed by subsequent extraction and GC-MS profiling of the trapped compounds. Surprisingly, even in absence of external stress factors with known impact on root exudation, such as pH extremes, water and nutrient limitations/toxicities or soil structure effects (use of sieved soils), root growth characteristics (root length, fine root development) as well as profiles of root exudates were strongly influenced by the soil type used for plant cultivation. The results coincided well with differences in rhizosphere bacterial communities, detected in field-grown lettuce plants cultivated on the same soils (Schreiter et al., this issue). The findings suggest that the observed differences may be the result of plant interactions with the soil-specific microbiomes.
机译：植物根的发育和活性表现出高度的适应性变异。尽管有充分的文献证明，理化土壤的性质会强烈影响根系的形态和根系渗出，尤其是在田间条件下，但由于其他因素（如气候和耕种历史）的影响，比较评估变得很复杂。为了克服这些局限性，在这项研究中，使用了源自具有三种不同土壤类型的独特实验田地系统的田间土壤，这些田间土壤在同一田间地点存储了10年并经历了相同的农业管理实践，从而对土壤进行了调查。类型对根系发育和根系渗出的影响莴苣（Lactuca sativa L. cv。Tizian）在装有根观察窗（根瘤菌箱）的微型根瘤菌系统中在受控环境条件下作为模型植物生长。根系分泌物的收集方法是将吸附过滤器置于根系表面，然后进行提取和捕获化合物的GC-MS分析。出乎意料的是，即使在没有已知的外部压力因素对根系渗出有已知影响的情况下，例如pH极限，水分和养分限制/毒性或土壤结构影响（使用过筛的土壤），根系生长特征（根系长度，细根发育）根系分泌物的概况以及根系分泌物的概况都受到用于植物栽培的土壤类型的强烈影响。该结果与在相同土壤上种植的田间生菜植物中检测到的根际细菌群落差异非常吻合（Schreiter等人，本期）。这些发现表明观察到的差异可能是植物与土壤特异性微生物群落相互作用的结果。

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