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首页> 外文期刊>Molecular Plant-Microbe Interactions >Growth Promotion of Chinese Cabbage and Arabidopsis by Piriformospora indica Is Not Stimulated by Mycelium-Synthesized Auxin
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Growth Promotion of Chinese Cabbage and Arabidopsis by Piriformospora indica Is Not Stimulated by Mycelium-Synthesized Auxin

机译：菌丝体合成的生长素不刺激印度梨形孢菌对大白菜和拟南芥的生长促进

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摘要

Piriformospora indica, an endophytic fungus of the order Sebacinales, interacts with the roots of a large variety of plant species. We compared the interaction of this fungus with Chinese cabbage (Brassica campestris subsp. chinensis) and Arabidopsis seedlings. The development of shoots and roots of Chinese cabbage seedlings was strongly promoted by P indica and the fresh weight of the seedlings increased approximately twofold. The strong stimulation of root hair development resulted in a bushy root phenotype. The auxin level in the infected Chinese cabbage roots was twofold higher compared with the uncolonized controls. Three classes of auxin-related genes, which were upregulated by P indica in Chinese cabbage roots, were isolated from a double-subtractive expressed sequence tag library: genes for proteins related to cell wall acidification, intercellular auxin transport carrier proteins such as AUX1, and auxin signal proteins. Overexpression of B. campestris BcAUX1 in Arabidopsis strongly promoted growth and biomass production of Arabidopsis seedlings and plants; the roots were highly branched but not bushy when compared with colonized Chinese cabbage roots. This suggests that BcAUX1 is a target of P indica in Chinese cabbage. P indica also promoted growth of Arabidopsis seedlings but the auxin levels were not higher and auxin genes were not upregulated, implying that auxin signaling is a more important target of P indica in Chinese cabbage than in Arabidopsis. The fungus also stimulated growth of Arabidopsis aux1 and aux1/axr4 and rhd6 seedlings. Furthermore, a component in an exudate fraction from P. indica but not auxin stimulated growth of Chinese cabbage and Arabidopsis seedlings. We propose that activation of auxin biosynthesis and signaling in the roots might be the cause for the P indica-mediated growth phenotype in Chinese cabbage.
机译：印度梨形孢子虫（Piriformospora indica）是一种Sebacinales的内生真菌，它与多种植物的根部相互作用。我们比较了这种真菌与白菜（Brassica campestris subsp。chinensis）和拟南芥幼苗之间的相互作用。 P稻促进了大白菜幼苗的芽和根的发育，幼苗的鲜重增加了约两倍。强烈刺激根毛发育导致根部表型浓密。与未定殖的对照相比，被感染的大白菜根中的生长素水平高出两倍。从双减表达序列标签文库中分离出三类被P稻上调的生长素相关基因：与细胞壁酸化相关的蛋白基因，细胞间生长素运输载体蛋白（如AUX1）和生长素信号蛋白。拟南芥中B. campestris BcAUX1的过表达强烈促进了拟南芥幼苗和植物的生长和生物量的产生;与定植的大白菜根相比，根是高度分支的，但不浓密。这表明BcAUX1是大白菜中P的靶标。 in稻还促进了拟南芥幼苗的生长，但生长素水平并未升高，生长素基因并未上调，这意味着生长素信号传导比大白菜在大白菜中更重要。该真菌还刺激了拟南芥aux1和aux1 / axr4和rhd6幼苗的生长。此外，来自印度假单胞菌而不是生长素的分泌物中的成分刺激了大白菜和拟南芥幼苗的生长。我们认为植物生长素在根中的生物合成和信号传导的激活可能是大白菜P d介导的生长表型的原因。

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