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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Regulation of root development in Arabidopsis thaliana by phytohormone-secreting epiphytic methylobacteria
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Regulation of root development in Arabidopsis thaliana by phytohormone-secreting epiphytic methylobacteria

机译：通过植物激素分泌素甲基菌治疗拟南芥拟南芥的根部发育

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In numerous experimental studies, seedlings of the model dicot Arabidopsis thaliana have been raised on sterile mineral salt agar. However, under natural conditions, no plant has ever grown in an environment without bacteria. Here, we document that germ-free (gnotobiotic) seedlings, raised on mineral salt agar without sucrose, develop very short root hairs. In the presence of a soil extract that contains naturally occurring microbes, root hair elongation is promoted; this effect can be mimicked by the addition of methylobacteria to germ-free seedlings. Using five different bacterial species (Methylobacterium mesophilicum, Methylobacterium extorquens, Methylobacterium oryzae, Methylobacterium podarium, and Methylobacterium radiotolerans), we show that, over 9 days of seedling development in a light-dark cycle, root development (hair elongation, length of the primary root, branching patterns) is regulated by these epiphytic microbes that occur in the rhizosphere of field-grown plants. In a sterile liquid culture test system, auxin (IAA) inhibited root growth with little effect on hair elongation and significantly stimulated hypocotyl enlargement. Cytokinins (trans-zeatin, kinetin) and ethylene (application of the precursor ACC) likewise exerted an inhibitory effect on root growth but, in contrast to IAA, drastically stimulated root hair elongation. Methylobacteria are phytosymbionts that produce/secrete cytokinins. We conclude that, under real-world conditions (soil), the provision of these phytohormones by methylobacteria and other epiphytic microbes) regulates root development during seedling establishment.
机译：在许多实验研究中，模型拟南芥的幼苗已经在无菌矿物盐琼脂上提出。然而，在自然条件下，没有细菌的环境中没有生长植物。在这里，我们记录无菌（侏略虫）幼苗，在不含蔗糖的矿物盐琼脂上提出，产生非常短的根毛。在存在天然存在的微生物的土壤提取物存在下，促进了根毛伸长率;可以通过向无菌幼苗添加甲基杆菌来模仿这种效果。使用五种不同的细菌物种（甲基杆菌，甲基杆菌，甲基杆菌，甲基杆菌，甲基杆菌和甲基杆菌雷替洛氏菌），我们表明，在光暗循环中超过9天的幼苗发育，根部发育（头发伸长，初级的长度根部，分支模式）由这些因果幼儿微生物调节，该果皮微生物在田间生成的植物的根际。在无菌液体培养试验系统中，蟾蜍蛋白（IAA）抑制了根生长，对毛发伸长率几乎没有影响，显着刺激的缺口扩大。细胞蛋白（反式Zeatin，Kinetin）和乙烯（前体ACC的施用）同样施加对根生长的抑制作用，但与IAA相比，令人惊讶地刺激的根毛伸长率。甲基杆菌是产生/分泌细胞蛋白的植物对霉菌。我们得出结论，根据现实世界的条件（土壤），通过甲基杀菌和其他果皮微生物提供这些植物激素）在苗木建立期间调节根系发展。

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