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A soil-free root observation system for the study of root-microorganism interactions in maize

机译：用于研究玉米根与微生物相互作用的无土根观测系统

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摘要

The root surface of a plant usually exceeds the leaf area and is constantly exposed to a variety of soil-borne microorganisms. Root pathogens and pests, as well as belowground interactions with beneficial microbes, can significantly influence a plants' performance. Unfortunately, the analysis of these interactions is often limited because of the arduous task of accessing roots growing in soil. Here, we present a soil-free root observation system (SF-ROBS) designed to grow maize (Zea mays) plants and to study root interactions with either beneficial or pathogenic microbes. The SF-ROBS consists of pouches lined with wet filter paper supplying nutrient solution. The aspect of maize grown in the SF-ROBS was similar to soil-grown maize; the plant growth was similar for the shoot but different for the roots (biomass and length increased in the SF-ROBS). SF-ROBS-grown roots were successfully inoculated with the hemi-biotrophic maize fungal pathogen Colletotrichum graminicola and the beneficial rhizobacteria Pseudomonas putida KT2440. Thus, the SF-ROBS is a system suitable to study two major belowground phenomena, namely root fungal defense reactions and interactions of roots with beneficial soil-borne bacteria. This system contributes to a better understanding of belowground plant microbe interactions in maize and most likely also in other crops.
机译：植物的根表面通常超过叶的面积，并不断暴露于各种土壤传播的微生物。根部病原体和害虫以及地下与有益微生物的相互作用会极大地影响植物的生长性能。不幸的是，由于获取土壤中生长的根基的艰巨任务，对这些相互作用的分析常常受到限制。在这里，我们介绍了一种无土的根系观测系统（SF-ROBS），该系统旨在种植玉米（Zea mays）植物并研究与有益或病原微生物的根系相互作用。 SF-ROBS由内衬湿袋的小袋组成，湿袋提供营养液。 SF-ROBS中种植的玉米与土壤种植的玉米相似;枝条的植物生长相似，但根部不同（SF-ROBS中的生物量和长度增加）。 SF-ROBS生长的根已成功接种了半生营养性玉米真菌病原菌Graminiotrichum graminicola和有益的根瘤菌恶臭假单胞菌KT2440。因此，SF-ROBS是适用于研究两种主要地下现象的系统，即根真菌防御反应以及根与有益的土壤传播细菌的相互作用。该系统有助于更好地了解玉米以及其他作物中地下植物微生物的相互作用。

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