Copper mediates auxin signalling to control cell differentiation in the copper moss Scopelophila cataractae

Nomura, Toshihisa; Itouga, Misao; Kojima, Mikiko; Kato, Yukari; Sakakibara, Hitoshi; Hasezawa, Seiichiro

doi:10.1093/jxb/eru470

Cited by 29 publications

(17 citation statements)

References 46 publications

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“…In Arabidopsis L-Kyn acts as an alternative substrate and competitive inhibitor for the TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS1 ( TAA1 ) and TRYPTOPHAN AMINOTRANSFERASE RELATED1 , 2 ( TAR1 , 2 ) enzymes, inhibiting the conversion of tryptophan (trp) to indole-3-pyruvic acid (IPA), a key step in auxin biosynthesis [ 4 , 57 , 58 ]. Arabidopsis plants grown in the presence of 100 μM L-Kyn phenocopy wei8 tar2 double mutants (the weak ethylene insensitive 8 mutant is a null loss-of-function allele of TAA1 ) [ 57 , 59 ].…”

Section: Resultsmentioning

confidence: 99%

A Simple Auxin Transcriptional Response System Regulates Multiple Morphogenetic Processes in the Liverwort Marchantia polymorpha

2015

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In land plants comparative genomics has revealed that members of basal lineages share a common set of transcription factors with the derived flowering plants, despite sharing few homologous structures. The plant hormone auxin has been implicated in many facets of development in both basal and derived lineages of land plants. We functionally characterized the auxin transcriptional response machinery in the liverwort Marchantia polymorpha, a member of the basal lineage of extant land plants. All components known from flowering plant systems are present in M. polymorpha, but they exist as single orthologs: a single MpTOPLESS (TPL) corepressor, a single MpTRANSPORT INHIBITOR RESPONSE 1 auxin receptor, single orthologs of each class of AUXIN RESPONSE FACTOR (ARF; MpARF1, MpARF2, MpARF3), and a single negative regulator AUXIN/INDOLE-3-ACETIC ACID (MpIAA). Phylogenetic analyses suggest this simple system is the ancestral condition for land plants. We experimentally demonstrate that these genes act in an auxin response pathway — chimeric fusions of the MpTPL corepressor with heterodimerization domains of MpARF1, MpARF2, or their negative regulator, MpIAA, generate auxin insensitive plants that lack the capacity to pattern and transition into mature stages of development. Our results indicate auxin mediated transcriptional regulation acts as a facilitator of branching, differentiation and growth, rather than acting to determine or specify tissues during the haploid stage of the M. polymorpha life cycle. We hypothesize that the ancestral role of auxin is to modulate a balance of differentiated and pluri- or totipotent cell states, whose fates are determined by interactions with combinations of unrelated transcription factors.

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Section: Resultsmentioning

confidence: 99%

A Simple Auxin Transcriptional Response System Regulates Multiple Morphogenetic Processes in the Liverwort Marchantia polymorpha

2015

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“…1C). The relationship between copper and auxin homeostasis remains to be elucidated but it is noteworthy that copper promotes auxin accumulation and cell proliferation in the copper moss Scopelophila cataracta (Nomura et al, 2015), and excess copper prevents auxin redistribution in the root through interacting with an auxin efflux carrier, Pinformed1 (PIN1), (Yuan et al, 2013). The precise nature of documented here copper-deficiency promoted changes in shoot architecture remains to be established.…”

Section: Copper Deficiency Alters Shoot Architecture In Arabidopsismentioning

confidence: 99%

Copper deficiency alters shoot architecture and reduces fertility of both gynoecium and androecium inArabidopsis thaliana

Ishka

Vatamaniuk

2020

Preprint

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Date of submission: 6/11/2020 Number of tables: 2 Number of figures: 8 all in color online only Word count: 8157 words including 690 words related to references cited within the text Number of supplementary tables: 1 Number of supplementary figures: 2 Highlight Copper deficiency alters shoot architecture, delays flowering and senescence, and compromises fertility by altering stigma morphology, disrupting anther lignification and dehiscence, and pollen redox status in Arabidopsis thaliana. 3 Abstract Copper deficiency reduces plant growth, male fertility and seed set. The contribution of copper to female fertility and the underlying molecular aspects of copper deficiency-caused phenotypes are not well-known. We show that among copper deficiency-caused defects in Arabidopsis thaliana were the increased shoot branching, delayed flowering and senescence, and entirely abolished gynoecium fertility. The increased shoot branching of copper-deficient plants was rescued by the exogenous application of auxin or copper. The delayed flowering was associated with the decreased expression of the floral activator, FT. Copper deficiency also decreased the expression of senescence-associated genes, WRKY53 and SAG13, but increased the expression of SAG12. The reduced fertility of copper-deficient plants stemmed from multiple factors including the abnormal stigma papillae development, the abolished gynoecium fertility, and the failure of anthers to dehisce. The latter defect was associated with reduced lignification, the upregulation of copper microRNAs and the downregulation of their targets, laccases, implicated in lignin synthesis. Copper-deficient plants accumulated ROS in pollen and had reduced cytochrome c oxidase activity in leaves. This study opens new avenues for the investigation into the relationship between copper homeostasis, hormone-mediated shoot architecture, gynoecium fertility and copper deficiency-derived nutritional signals leading to the delay in flowering and senescence.

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“…Additionally, auxin transport via AUXIN RESISTANT 1 (AUX1) has been shown to play a positive role in plant tolerance to arsenite stress by influencing reactive oxygen species (ROS)-mediated signalling pathways 15 . Finally, copper (Cu 2+ ) treatments modulated auxin redistribution via regulation of PINFORMED1 (PIN1) in Arabidopsis roots, and exogenous application of auxin reduced the toxic effect of Cu 2+ on sunflower ( Helianthus annuus ), leading to an increase in root length and root hair formation 16 17 . However, limited information is available on the roles that auxin plays in plant responses to Al 3+ stress.…”

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confidence: 99%

Aluminium-induced reduction of plant growth in alfalfa (Medicago sativa) is mediated by interrupting auxin transport and accumulation in roots

Wang

Ren

Huang

et al. 2016

Sci Rep

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The objective of this study was to investigate Al3+-induced IAA transport, distribution, and the relation of these two processes to Al3+-inhibition of root growth in alfalfa. Alfalfa seedlings with or without apical buds were exposed to 0 or 100 μM AlCl3 and were foliar sprayed with water or 6 mg L−1 IAA. Aluminium stress resulted in disordered arrangement of cells, deformed cell shapes, altered cell structure, and a shorter length of the meristematic zone in root tips. Aluminium stress significantly decreased the IAA concentration in apical buds and root tips. The distribution of IAA fluorescence signals in root tips was disturbed, and the IAA transportation from shoot base to root tip was inhibited. The highest intensity of fluorescence signals was detected in the apical meristematic zone. Exogenous application of IAA markedly alleviated the Al3+-induced inhibition of root growth by increasing IAA accumulation and recovering the damaged cell structure in root tips. In addition, Al3+ stress up-regulated expression of AUX1 and PIN2 genes. These results indicate that Al3+-induced reduction of root growth could be associated with the inhibitions of IAA synthesis in apical buds and IAA transportation in roots, as well as the imbalance of IAA distribution in root tips.

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Copper mediates auxin signalling to control cell differentiation in the copper moss Scopelophila cataractae

Abstract: SummaryThe habitat of copper moss— Scopelophila cataractae—is restricted to Cu-enriched environments. We show that the early stage of protonemal development in S. cataractae is controlled by Cu through auxin signalling.

Cited by 29 publications

References 46 publications

A Simple Auxin Transcriptional Response System Regulates Multiple Morphogenetic Processes in the Liverwort Marchantia polymorpha

A Simple Auxin Transcriptional Response System Regulates Multiple Morphogenetic Processes in the Liverwort Marchantia polymorpha

Copper deficiency alters shoot architecture and reduces fertility of both gynoecium and androecium inArabidopsis thaliana

Aluminium-induced reduction of plant growth in alfalfa (Medicago sativa) is mediated by interrupting auxin transport and accumulation in roots

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