Phosphorus and nitrogen regulate arbuscular mycorrhizal symbiosis in Petunia hybrida.
Phosphorus and nitrogen regulate arbuscular mycorrhizal symbiosis in Petunia hybrida.
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DOI：
10.1371/journal.pone.0090841
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Reinhardt D
中科院分区：
文献类型：
--
作者：
Nouri E;Breuillin-Sessoms F;Feller U;Reinhardt D
磷和氮是植物大量需要的必需营养元素。植物与土壤真菌之间的丛枝菌根共生在限制条件下促进了磷和氮的获取。另一方面，这些营养物质影响菌根真菌的定植和共生功能。这代表了一种反馈机制，允许植物根据营养需求和供应来控制真菌共生体。高磷供应先前已被证明对丛枝菌根的发育有很强的抑制作用。本文研究了矮牵牛（Petunia hybrida）与不规则矮牵牛（r.r irregularis）相互作用中磷的抑制作用在多大程度上受到其他营养途径的影响。我们表明，磷和氮是相互作用的主要营养决定因素。有趣的是，氮饥饿对共生的促进作用大大超过了高磷营养对灌木菌根的抑制作用，这表明植物只要受到两种主要营养物质之一的限制，就会促进共生。研究结果还表明，在给定的一对共生伴侣（矮牵牛和不规则矮牵牛）中，根据营养条件的不同，可以观察到从共生到寄生的整个范围。综上所述，这些结果揭示了丛枝菌根真菌控制根定植的复杂营养反馈机制。
Phosphorus and nitrogen are essential nutrient elements that are needed by plants in large amounts. The arbuscular mycorrhizal symbiosis between plants and soil fungi improves phosphorus and nitrogen acquisition under limiting conditions. On the other hand, these nutrients influence root colonization by mycorrhizal fungi and symbiotic functioning. This represents a feedback mechanism that allows plants to control the fungal symbiont depending on nutrient requirements and supply. Elevated phosphorus supply has previously been shown to exert strong inhibition of arbuscular mycorrhizal development. Here, we address to what extent inhibition by phosphorus is influenced by other nutritional pathways in the interaction between Petunia hybrida and R. irregularis. We show that phosphorus and nitrogen are the major nutritional determinants of the interaction. Interestingly, the symbiosis-promoting effect of nitrogen starvation dominantly overruled the suppressive effect of high phosphorus nutrition onto arbuscular mycorrhiza, suggesting that plants promote the symbiosis as long as they are limited by one of the two major nutrients. Our results also show that in a given pair of symbiotic partners (Petunia hybrida and R. irregularis), the entire range from mutually symbiotic to parasitic can be observed depending on the nutritional conditions. Taken together, these results reveal complex nutritional feedback mechanisms in the control of root colonization by arbuscular mycorrhizal fungi.
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影响因子：
7.4
作者：
Allen, James W.;Shachar-Hill, Yair
通讯作者：
Shachar-Hill, Yair
影响因子：
2.9
作者：
Cai, Hongmei;Lu, Yongen;Lian, Xingming
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DOI：
10.1073/pnas.1118650109
发表时间：
2012-02-14
影响因子：
11.1
作者：
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Buecking, Heike
影响因子：
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作者：
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通讯作者：
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影响因子：
5
作者：
Alguacil, M. M.;Lumini, E.;Bianciotto, V.
通讯作者：
Bianciotto, V.