Can orchid mycorrhizal fungi be persistently harbored by the plant host?

Calevo, Jacopo; Voyron, Samuele; Adamo, Martino; Alibrandi, Pasquale; Perotto, Silvia

doi:10.1016/j.funeco.2021.101071

Cited by 11 publications

(13 citation statements)

References 62 publications

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“…Soil-inhabiting fungi have been described as essential partners in the initial developmental stages of orchids and crucial in promoting seed germination and further establishment [ 50 ]. In this study, we have identified different fungal taxa associated with the orchid rhizosphere, including widely distributed soil-beneficial fungi such as Cladosporium spp., Purpureocillium spp., and Mortierella spp.…”

Section: Discussionmentioning

confidence: 99%

Diversity of Root-Associated Fungi of the Terrestrial Orchids Gavilea lutea and Chloraea collicensis in a Temperate Forest Soil of South-Central Chile

Herrera

Sanhueza

Valadares

et al. 2022

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The diversity of orchid mycorrhizal fungi (OMF) and other beneficial root-associated fungi in temperate forests has scarcely been examined. This study aimed to analyze the diversity of mycorrhizal and rhizosphere-associated fungal communities in the terrestrial orchids Gavilea lutea and Chloraea collicensis growing in high-orchid-population-density areas in the piedmont of the Andes Cordillera with native forest (Nothofagus-Araucaria) and Coastal Cordillera with an exotic plantation (Pinus-Eucalyptus) in south-central Chile. We focused on rhizosphere-inhabiting and peloton-associated OMF in a native forest (Andes Cordillera) and a mixed forest (Coastal Cordillera). The native terrestrial orchids G. lutea and C. collicensis were localized, mycorrhizal root segments were taken to isolate peloton-associated OMF, and rhizosphere soil was taken to perform the metabarcoding approach. The results revealed that Basidiomycota and Ascomycota were the main rhizosphere-inhabiting fungal phyla, showing significant differences in the composition of fungal communities in both sites. Sebacina was the most-abundant OMF genera in the rhizosphere of G. lutea growing in the native forest soil. In contrast, Thanatephorus was the most abundant mycorrhizal taxa growing in the rhizosphere of orchids from the Coastal Cordillera. Besides, other OMF genera such as Inocybe, Tomentella, and Mycena were detected. The diversity of OMF in pelotons differed, being mainly related to Ceratobasidium sp. and Tulasnella sp. These results provide evidence of differences in OMF from pelotons and the rhizosphere soil in G. lutea growing in the Andes Cordillera and a selection of microbial communities in the rhizosphere of C. collicensis in the Coastal Cordillera. This raises questions about the efficiency of propagation strategies based only on mycorrhizal fungi obtained by culture-dependent methods, especially in orchids that depend on non-culturable taxa for seed germination and plantlet development.

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Section: Discussionmentioning

confidence: 99%

Diversity of Root-Associated Fungi of the Terrestrial Orchids Gavilea lutea and Chloraea collicensis in a Temperate Forest Soil of South-Central Chile

Herrera

Sanhueza

Valadares

et al. 2022

JoF

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“…change significantly over time, but those of Corallorhiza maculata, Paphiopedilum spicerianum, and Cypripedium calceolus are not sensitive to seasonal changes [23,25,51,55]. Since fungal migrations across old and young tissues are more difficult in orchids with annual roots, they are inclined to recruit fungi from the soil species pool and thus have more frequent fungal changes [8,24,25,56,57]. For example, the younger, elongated, and older roots of Anacamptis morio are dominated by OMF of Tulasnellaceae, Pezizaceae, and Ceratobasidiaceae, respectively and few fungi are shared by four or five time points [8].…”

Section: The Relative Constant Omf Assemblages In P Bulbocodioidesmentioning

confidence: 99%

“…Extrinsic or environmental drivers, e.g., seasonal changes in temperature or water/resource availability or the degree of environmental stress for both plants and fungi, may also cause shifts in fungal symbiosis [20][21][22][23]. Changes in OMF richness and compositions at annual or seasonal scales have also been reported in a few species [8,24,25]. The temporal turnover of OMF in different plant taxa can be categorized into 11 different scenarios that vary in a broad range from fidelity to replacement across time points [3].…”

Section: Introductionmentioning

confidence: 99%

Mycorrhizal Fungal Partners Remain Constant during a Root Lifecycle of Pleione bulbocodioides (Orchidaceae)

Qin

Feng

Zhang

et al. 2021

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Mycorrhizal mutualisms are vital for orchids through germination to adulthood. Fungal species diversity and community composition vary across seasons and plant development stages and affect plant survival, adaptation, and community maintenance. Knowledge of the temporal turnover of mycorrhizal fungi (OMF) remains poorly understood in the eco-physiologically diverse orchids (especially in epiphytic orchids), although it is important to understand the function and adaptation of mycorrhizae. Some species of Pleione are epiphytic plants with annual roots and may recruit different fungal partners during their root lifecycle. Based on continuous samplings of Pleione bulbocodioides during a whole root lifecycle, we characterized the fungal temporal dynamics using Illumina sequencing of the ITS2 region. Our data showed that the plants of P. bulbocodioides were quickly colonized by OMF at root emergence and had a constant OMF composition throughout one root lifecycle, although the OMF richness declined with root aging after a peak occurrence during root elongation. In contrast, the richness of root-inhabiting fungal endophytes kept increasing with root aging and more drastic turnovers were found in their species compositions. Our findings of OMF temporal turnover contribute to further understanding of mycorrhizal associations and adaptation of Orchidaceae and will benefit orchid resource conservation and utilization.

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“…Although the effects of these microorganisms on the structure and spatial distribution of root microbial communities of Rhododendron spp. and other plants have been studied ( Fadaei et al, 2020 ; Calevo et al, 2021 ). However, most studies focus on single or mixed mycorrhizal fungi in the plants which effect to heat tolerance ( Fadaei et al, 2020 ; Calevo et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Changes of endophytic microbial community in Rhododendron simsii roots under heat stress and its correlation with leaf physiological indicators

et al. 2022

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IntroductionThe response mechanism of Rhododendron simsii and its endophytic microorganism to heat stress is still unclear.MethodsThe light incubator was used to set the temperature gradients, and the control (CK) was (day/night: 14/10 h) 25/22°C, the moderate-heat-stress (MHS) was 35/30°C and the high-heat-stress (HHS) was 40/35°C.ResultsCompared with CK, MHS significantly increased the contents of malondialdehyde, hydrogen peroxide, proline, and soluble sugar, as well as the activities of catalase and peroxidase in leaf, while HHS increased the activities of ascorbate peroxidase, and decreased chlorophyll content. Compared with CK, MHS reduced soil available nitrogen (N) content. Both heat stress changed the endophytic microbial community structure in roots. MHS enriched Pezicula and Paracoccus, while HHS significantly enriched Acidothermus and Haliangium. The abundance of Pezicula positively correlated with the contents of chlorophyll a and proline in leaf, and negatively correlated with soil ammonium N content. The abundance of Pezicula and Haliangium positively correlated with soluble sugar and malondialdehyde contents, respectively.ConclusionsOur results suggest that root endophytic microorganisms play an important role in helping Rhododendron resisting heat stress, mainly by regulating soil N content and plant physiological characteristics.

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Can orchid mycorrhizal fungi be persistently harbored by the plant host?

Cited by 11 publications

References 62 publications

Diversity of Root-Associated Fungi of the Terrestrial Orchids Gavilea lutea and Chloraea collicensis in a Temperate Forest Soil of South-Central Chile

Diversity of Root-Associated Fungi of the Terrestrial Orchids Gavilea lutea and Chloraea collicensis in a Temperate Forest Soil of South-Central Chile

Mycorrhizal Fungal Partners Remain Constant during a Root Lifecycle of Pleione bulbocodioides (Orchidaceae)

Changes of endophytic microbial community in Rhododendron simsii roots under heat stress and its correlation with leaf physiological indicators

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