Morphology, phylogeny, and taxonomy of <i>Microthlaspi</i> (Brassicaceae: Coluteocarpeae) and related genera

As currently delimitated, the species-rich mustard tribe Euclidieae DC. (Brassicaceae) comprises 28 genera and 152 species distributed primarily in Asia. To date, no tribe-wide comprehensive phylogenetic analysis has been conducted. In this study, sequence data from the nuclear ribosomal internal transcribed spacer (nrITS) region of 82 species in all 28 genera of Euclidieae were used to test its monophyly and infer inter- and intra-generic relationships within. Phylogenetic analyses revealed that Rhammatophyllum and Sisymbriopsis are embedded within Solms-laubachia s.l., and Solms-laubachia lanuginosa (Eurycarpus lanuginosus) fell outside the tribe. Therefore, Solms-laubachia s.l. as currently recognized is not monophyletic and its generic delimitation needed further study. Besides, our results suggest that the genera Lepidostemon, Neotorularia, and Tetracme are polyphyletic.

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“…(Al-Shehbaz and Warwick 2005), Microthlaspi F. K. Mey. (Ali et al 2016), to name a few, demonstrate that trend.…”

Section: Introductionmentioning

confidence: 88%

New insights into the taxonomy of tribe Euclidieae (Brassicaceae), evidence from nrITS sequence data

Chen

Al‐Shehbaz

Yue

et al. 2018

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“…Seeds of A. thaliana were provided by the Laboratory of Plant Physiology of Wageningen University. Seeds of M. erraticum were collected from a field population in Germany (Mp_K11; Ali et al, 2016). Barley seeds were provided by the company Saatzucht Josef Breun GmbH & Co. KG (Herzogenaurach, Germany).…”

Section: Methodsmentioning

confidence: 99%

Influence of phylogenetic conservatism and trait convergence on the interactions between fungal root endophytes and plants

et al. 2016

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Plants associate through their roots with fungal assemblages that impact their abundance and productivity. Non-mycorrhizal endophytes constitute an important component of such fungal diversity, but their implication in ecosystem processes is little known. Using a selection of 128 root-endophytic strains, we defined functional groups based on their traits and plant interactions with potential to predict community assembly and symbiotic association processes. In vitro tests of the strains' interactions with Arabidopsis thaliana, Microthlaspi erraticum and Hordeum vulgare showed a net negative effect of fungal colonization on plant growth. The effects partly depended on the phylogenetic affiliation of strains, but also varied considerably depending on the plant-strain combination. The variation was partly explained by fungal traits shared by different lineages, like growth rates or melanization. The origin of strains also affected their symbioses, with endophytes isolated from Microthlaspi spp. populations being more detrimental to M. erraticum than strains from other sources. Our findings suggest that plant-endophyte associations are subject to local processes of selection, in which particular combinations of symbionts are favored across landscapes. We also show that different common endophytic taxa have differential sets of traits found to affect interactions, hinting to a functional complementarity that can explain their frequent co-existence in natural communities.

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“…Fungal material originated from a previous study (Glynou et al., ) on the diversity of endophytic fungi associated with roots of the brassicaceous plants Microthlaspi erraticum and Microthlaspi perfoliatum (Ali, Runge et al., ; Ali, Schmuker et al., ). In that study, a collection of 2,006 fungal cultures was generated after the cultivation of surface‐sterilized root segments from plants in 52 populations, distributed across northern Mediterranean and central Europe (Figure ).…”

Section: Methodsmentioning

confidence: 99%

Genotypic diversity in root‐endophytic fungi reflects efficient dispersal and environmental adaptation

et al. 2017

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Studying community structure and dynamics of plant-associated fungi is the basis for unravelling their interactions with hosts and ecosystem functions. A recent sampling revealed that only a few fungal groups, as defined by internal transcribed spacer region (ITS) sequence similarity, dominate culturable root endophytic communities of nonmycorrhizal Microthlaspi spp. plants across Europe. Strains of these fungi display a broad phenotypic and functional diversity, which suggests a genetic variability masked by ITS clustering into operational taxonomic units (OTUs). The aims of this study were to identify how genetic similarity patterns of these fungi change across environments and to evaluate their ability to disperse and adapt to ecological conditions. A first ITS-based haplotype analysis of ten widespread OTUs mostly showed a low to moderate genotypic differentiation, with the exception of a group identified as Cadophora sp. that was highly diverse. A multilocus phylogeny based on additional genetic loci (partial translation elongation factor 1α, beta-tubulin and actin) and amplified fragment length polymorphism profiling of 185 strains representative of the five dominant OTUs revealed a weak association of genetic differences with geography and environmental conditions, including bioclimatic and soil factors. Our findings suggest that dominant culturable root endophytic fungi have efficient dispersal capabilities, and that their distribution is little affected by environmental filtering. Other processes, such as inter- and intraspecific biotic interactions, may be more important for the local assembly of their communities.

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Morphology, phylogeny, and taxonomy of Microthlaspi (Brassicaceae: Coluteocarpeae) and related genera

Cited by 27 publications

References 71 publications

New insights into the taxonomy of tribe Euclidieae (Brassicaceae), evidence from nrITS sequence data

New insights into the taxonomy of tribe Euclidieae (Brassicaceae), evidence from nrITS sequence data

Influence of phylogenetic conservatism and trait convergence on the interactions between fungal root endophytes and plants

Genotypic diversity in root‐endophytic fungi reflects efficient dispersal and environmental adaptation

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