The transportome of mycorrhizal systems

Courty, Pierre‐Emmanuel; Doidy, Joan; Garcia, Kevin; Wipf, Daniel; Zimmermann, Sabine

doi:10.1002/9781118951446.ch14

Cited by 13 publications

(7 citation statements)

References 131 publications

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“…This article presents some examples of interesting reviews on the fungal transportomes for mineral nutrients in mycorrhizal symbiosis. In these articles, the paragraphs referring to K + transport are not very extensive [26,45,46,47].…”

Section: The Dual Transportome For Plant K+ Nutrition Of the Two Pmentioning

confidence: 99%

The Role of Soil Fungi in K+ Plant Nutrition

Haro

Benito

2019

IJMS

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K+ is an essential cation and the most abundant in plant cells. After N, its corresponding element, K, is the nutrient required in the largest amounts by plants. Despite the numerous roles of K in crop production, improvements in the uptake and efficiency of use of K have not been major focuses in conventional or transgenic breeding studies in the past. In research on the mineral nutrition of plants in general, and K in particular, this nutrient has been shown to be essential to soil-dwelling-microorganisms (fungi, bacteria, protozoa, nematodes, etc.) that form mutualistic associations and that can influence the availability of mineral nutrients for plants. Therefore, this article aims to provide an overview of the role of soil microorganisms in supplying K+ to plants, considering both the potassium-solubilizing microorganisms and the potassium-facilitating microorganisms that are in close contact with the roots of plants. These microorganisms can influence the active transporter-mediated transfer of K+. Regarding the latter group of microorganisms, special focus is placed on the role of endophytic fungus. This review also includes a discussion on productivity through sustainable agriculture.

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Section: The Dual Transportome For Plant K+ Nutrition Of the Two Pmentioning

confidence: 99%

The Role of Soil Fungi in K+ Plant Nutrition

Haro

Benito

2019

IJMS

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“…Pioneer studies using radiotracers demonstrated the transport of 32 Pi from extra‐radical hyphae towards the plant cells, through the Hartig net (Melin & Nilsson, ). More specifically, ECM fungi express several high‐affinity transporters in extra‐radical hyphae to acquire Pi from the soil (Tatry et al ., ; Casieri et al ., ; Becquer et al ., ; Courty et al ., ; Garcia et al ., ). Once acquired, Pi is accumulated in fungal vacuoles as polyphosphates (polyPs) (Ashford et al ., , ).…”

Section: Introductionmentioning

confidence: 98%

The Hebeloma cylindrosporum HcPT2 Pi transporter plays a key role in ectomycorrhizal symbiosis

et al. 2018

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Through a mutualistic relationship with woody plant roots, ectomycorrhizal fungi provide growth-limiting nutrients, including inorganic phosphate (Pi), to their host. Reciprocal trades occur at the Hartig net, which is the symbiotic interface of ectomycorrhizas where the two partners are symplasmically isolated. Fungal Pi must be exported to the symbiotic interface, but the proteins facilitating this transfer are unknown. In the present study, we combined transcriptomic, microscopy, whole plant physiology, X-ray fluorescence mapping, P labeling and fungal genetic approaches to unravel the role of HcPT2, a fungal Pi transporter, during the Hebeloma cylindrosporum-Pinus pinaster ectomycorrhizal association. We localized HcPT2 in the extra-radical hyphae and the Hartig net and demonstrated its determinant role for both the establishment of ectomycorrhizas and Pi allocation towards P. pinaster. We showed that the host plant induces HcPT2 expression and that the artificial overexpression of HcPT2 is sufficient to significantly enhance Pi export towards the central cylinder. Together, our results reveal that HcPT2 plays an important role in ectomycorrhizal symbiosis, affecting both Pi influx in the mycelium and efflux towards roots under the control of P. pinaster.

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“…Arbuscular mycorrhizal (AM) symbiosis, formed between AM fungi of Glomeromycotina and roots of more than 80% of land plants, represents one of the most important symbiotic interactions in nature (Smith and Smith, 2011;Kobae et al, 2016). Formation of an AM symbiosis improves growth status for the plant partner, especially under nutrient-poor growing conditions (Govindarajulu et al, 2005;Javot et al, 2007;Jin et al, 2012;Casieri et al, 2013;Courty et al, 2016;Garcia et al, 2016). In the nonmycorrhizal (NM) plants, mineral nutrients can only be directly taken up from the rhizosphere via root epidermis and root hairs.…”

mentioning

confidence: 99%

The Potassium Transporter SlHAK10 Is Involved in Mycorrhizal Potassium Uptake

Liu

et al. 2019

Plant Physiol.

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Most terrestrial plants form a root symbiosis with arbuscular mycorrhizal (AM) fungi, which receive fixed carbon from the plant and enhance the plant's uptake of mineral nutrients. AM symbiosis improves the phosphorous and nitrogen nutrition of host plants; however, little is known about the role of AM symbiosis in potassium (K + ) nutrition. Here, we report that inoculation with the AM fungus Rhizophagus irregularis improved tomato (Solanum lycopersicum) plant growth and K + acquisition and that K + deficiency has a negative effect on root growth and AM colonization. Based on its homology to a Lotus japonicus AM-induced K + transporter, we identified a mycorrhiza-specific tomato K + transporter, SlHAK10 (Solanum lycopersicum High-affinity Potassium Transporter10), that was exclusively expressed in arbuscule-containing cells. SlHAK10 could restore a yeast K + uptake-defective mutant in the low-affinity concentration range. Loss of function of SlHAK10 led to a significant decrease in mycorrhizal K + uptake and AM colonization rate under low-K + conditions but did not affect arbuscule development. Overexpressing SlHAK10 from the constitutive cauliflower mosaic virus 35S promoter or the AM-specific Solanum melongena Phosphate Transporter4 not only improved plant growth and K + uptake but also increased AM colonization efficiency and soluble sugar content in roots supplied with low K + . Our results indicate that tomato plants have a SlHAK10-mediated mycorrhizal K + uptake pathway and that improved plant K + nutrition could increase carbohydrate accumulation in roots, which facilitates AM fungal colonization.

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The transportome of mycorrhizal systems

Cited by 13 publications

References 131 publications

The Role of Soil Fungi in K+ Plant Nutrition

The Role of Soil Fungi in K+ Plant Nutrition

The Hebeloma cylindrosporum HcPT2 Pi transporter plays a key role in ectomycorrhizal symbiosis

The Potassium Transporter SlHAK10 Is Involved in Mycorrhizal Potassium Uptake

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