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首页> 外文期刊>The New Phytologist >Combined phosphate and nitrogen limitation generates a nutrient stress transcriptome favorable for arbuscular mycorrhizal symbiosis in Medicago truncatula
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Combined phosphate and nitrogen limitation generates a nutrient stress transcriptome favorable for arbuscular mycorrhizal symbiosis in Medicago truncatula

机译：限制磷和氮的结合会产生一个营养胁迫转录组，有利于Medi藜苜蓿的丛枝菌根共生

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摘要

Arbuscular mycorrhizal (AM) symbiosis is stimulated by phosphorus (P) limitation and contributes to P and nitrogen (N) acquisition. However, the effects of combined P and N limitation on AM formation are largely unknown. Medicago truncatula plants were cultivated in the presence or absence of Rhizophagus irregularis (formerly Glomus intraradices) in P-limited (LP), N-limited (LN) or combined P- and N-limited (LPN) conditions, and compared with plants grown in sufficient P and N. The highest AM formation was observed in LPN, linked to systemic signaling by the plant nutrient status. Plant free phosphate concentrations were higher in LPN than in LP, as a result of cross-talk between P and N. Transcriptome analyses suggest that LPN induces the activation of NADPH oxidases in roots, concomitant with an altered profile of plant defense genes and a coordinate increase in the expression of genes involved in the methylerythritol phosphate and isoprenoid-derived pathways, including strigolactone synthesis genes. Taken together, these results suggest that low P and N fertilization systemically induces a physiological state of plants favorable for AM symbiosis despite their higher P status. Our findings highlight the importance of the plant nutrient status in controlling plant-fungus interaction.
机译：磷（P）限制会刺激丛枝菌根（AM）共生，并有助于磷和氮（N）的获取。但是，磷和氮的联合限制对AM形成的影响尚不清楚。在P限（LP），N限（LN）或P限和N限（LPN）组合条件下，在有无根霉菌（以前为Glomus intraradices）存在或不存在的条件下种植紫花苜蓿植物，并与生长的植物进行比较磷和氮的含量足够。在LPN中观察到最高的AM形成，这与植物营养状况与系统性信号传递有关。由于P和N之间的串扰，LPN中的植物游离磷酸盐浓度高于LP。转录组分析表明，LPN诱导了根部NADPH氧化酶的活化，并伴随着植物防御基因和轮廓的改变。增加了甲基赤藓糖醇磷酸和类异戊二烯衍生途径中涉及的基因的表达，包括松果内酯合成基因。综上所述，这些结果表明，低磷和低氮施肥系统地诱导了有利于AM共生的植物的生理状态，尽管它们的磷含量较高。我们的发现突出了植物营养状况在控制植物-真菌相互作用中的重要性。

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