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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Bacillus methylotrophicus M4-96 isolated from maize (Zea mays) rhizoplane increases growth and auxin content in Arabidopsis thaliana via emission of volatiles
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Bacillus methylotrophicus M4-96 isolated from maize (Zea mays) rhizoplane increases growth and auxin content in Arabidopsis thaliana via emission of volatiles

机译：从玉米（Zea mays）rhizoplane中分离的芽孢杆菌甲基雌激发M4-96通过挥发物排放来增加拟南芥拟南芥中的生长和生长素含量

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摘要

Plant growth-promoting rhizobacteria stimulate plant growth and development via different mechanisms. In this study, we characterized the effect of volatiles from Bacillus methylotrophicus M4-96 isolated from the maize rhizosphere on root and shoot development, and auxin homeostasis in Arabidopsis thaliana. Phytostimulation occurred after 4 days of interaction between M4-96 and Arabidopsis grown on opposite sides of divided Petri plates, as revealed by enhanced primary root growth, root branching, leaf formation, and shoot biomass accumulation. Analysis of indole-3-acetic acid content revealed two- and threefold higher accumulation in the shoot and root of bacterized seedlings, respectively, compared to uninoculated plants, which was correlated with increased expression of the auxin response marker DR5::GUS. The auxin transport inhibitor 1-naphthylphthalamic acid inhibited primary root growth and lateral root formation in axenically grown seedlings and antagonized the plant growth-promoting effects of M4-96. Analysis of bacterial volatile compounds revealed the presence of four classes of compounds, including ten ketones, eight alcohols, one aldehyde, and two hydrocarbons. However, the abundance of ketones and alcohols represented 88.73 and 8.05%, respectively, of all airborne signals detected, with acetoin being the main compound produced. Application of acetoin had a different effect from application of volatiles, suggesting that either the entire pool or acetoin acting in concert with another unidentified compound underlies the strong phytostimulatory response. Taken together, our results show that B. methylotrophicus M4-96 generates bioactive volatiles that increase the active auxin pool of plants, stimulate the growth and formation of new organs, and reprogram root morphogenesis.
机译：植物生长促进流虫通过不同的机制刺激植物生长和发展。在这项研究中，我们表征了从玉米根际的芽孢杆菌中挥发物从玉米根际的根源和芽的发育中分离的效果，以及拟南芥拟南芥的疾病稳态。 M4-96与拟南芥相互作用在分开的培养皿的相对侧面之间的相互作用后4天发生植物刺激，如通过增强的原始根生长，根部支化，叶片形成和芽生物质积累所揭示。与未处理的植物相比，吲哚-3-乙酸含量分别揭示了细菌幼苗的芽和根部的较高积聚，与未征收的植物相关，这与蟾蜍响应标记DR5 :: GUS的表达增加。制冷素转运抑制剂1-萘氨基酞酸抑制了亚烷基地生长的幼苗中的原始根生长和横向根系，并拮抗了M4-96的植物生长促进作用。细菌挥发性化合物的分析显示出四种类别的化合物，包括10酮，8醇，一个醛和两个烃。然而，酮和醇的丰度分别为88.73和8.05％检测到的所有空中信号，丙酮蛋白是产生的主要化合物。丙酮蛋白的应用挥发物的应用不同，这表明整个池或丙酮蛋白与另一个未识别的化合物一起作用，良好的植物刺激性反应是强烈的。我们的结果表明，B.甲基雌激素M4-96产生增加生物活性挥发物，这些生物活性挥发物增加植物的活性毒素，刺激新器官的生长和形成，并重新编程根形态发生。

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