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  1. Book ; Thesis: Somatic hybrids and cybrids within Brassicaceae

    Sundberg, Eva

    studies focused on refining production methods and identifying factors influencing the genetic composition of somatic hybrids

    1991  

    Author's details Eva Sundberg
    Keywords Kreuzblütler ; Somatische Hybridisierung
    Subject Hybridisierung ; Zellhybridisierung ; Brassicaceae ; Cruciferae ; Kruziferen ; Kreuzblütengewächse
    Size Getr. Zählung : Ill., graph. Darst.
    Publishing country Sweden
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Uppsala, Swedish Univ.of Argicultural Sciences, Diss., 1991
    HBZ-ID HT006402088
    ISBN 91-576-4501-9 ; 978-91-576-4501-2
    Database Catalogue ZB MED Nutrition, Environment, Agriculture

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  2. Article ; Online: Dependence on clade II bHLH transcription factors for nursing of haploid products by tapetal-like cells is conserved between moss sporangia and angiosperm anthers.

    Lopez-Obando, Mauricio / Landberg, Katarina / Sundberg, Eva / Thelander, Mattias

    The New phytologist

    2022  Volume 235, Issue 2, Page(s) 718–731

    Abstract: Clade II basic helix-loop-helix transcription factors (bHLH TFs) are essential for pollen production and tapetal nursing functions in angiosperm anthers. As pollen has been suggested to be related to bryophyte spores by descent, we characterized two ... ...

    Abstract Clade II basic helix-loop-helix transcription factors (bHLH TFs) are essential for pollen production and tapetal nursing functions in angiosperm anthers. As pollen has been suggested to be related to bryophyte spores by descent, we characterized two Physcomitrium (Physcomitrella) patens clade II bHLH TFs (PpbHLH092 and PpbHLH098), to test if regulation of sporogenous cells and the nursing cells surrounding them is conserved between angiosperm anthers and bryophyte sporangia. We made CRISPR-Cas9 reporter and loss-of-function lines to address the function of PpbHLH092/098. We sectioned and analyzed WT and mutant sporophytes for a comprehensive stage-by-stage comparison of sporangium development. Spore precursors in the P. patens sporangium are surrounded by nursing cells showing striking similarities to tapetal cells in angiosperms. Moss clade II bHLH TFs are essential for the differentiation of these tapetal-like cells and for the production of functional spores. Clade II bHLH TFs provide a conserved role in controlling the sporophytic somatic cells surrounding and nursing the sporogenous cells in both moss sporangia and angiosperm anthers. This supports the hypothesis that such nursing functions in mosses and angiosperms, lineages separated by c. 450 million years, are related by descent.
    MeSH term(s) Basic Helix-Loop-Helix Transcription Factors/genetics ; Bryopsida/metabolism ; Gene Expression Regulation, Plant ; Haploidy ; Magnoliopsida/genetics ; Magnoliopsida/metabolism ; Plant Proteins/metabolism ; Sporangia/metabolism ; Spores, Fungal/metabolism
    Chemical Substances Basic Helix-Loop-Helix Transcription Factors ; Plant Proteins
    Language English
    Publishing date 2022-02-05
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.17972
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: MS1/MMD1 homologues in the moss Physcomitrium patens are required for male and female gametogenesis

    Landberg, Katarina / Lopez‐Obando, Mauricio / Sanchez Vera, Victoria / Sundberg, Eva / Thelander, Mattias

    The new phytologist. 2022 Oct., v. 236, no. 2

    2022  

    Abstract: The Arabidopsis Plant HomeoDomain (PHD) proteins AtMS1 and AtMMD1 provide chromatin‐mediated transcriptional regulation essential for tapetum‐dependent pollen formation. This pollen‐based male gametogenesis is a derived trait of seed plants. Male ... ...

    Abstract The Arabidopsis Plant HomeoDomain (PHD) proteins AtMS1 and AtMMD1 provide chromatin‐mediated transcriptional regulation essential for tapetum‐dependent pollen formation. This pollen‐based male gametogenesis is a derived trait of seed plants. Male gametogenesis in the common ancestors of land plants is instead likely to have been reminiscent of that in extant bryophytes where flagellated sperms are produced by an elaborate gametophyte generation. Still, also bryophytes possess MS1/MMD1‐related PHD proteins. We addressed the function of two MS1/MMD1‐homologues in the bryophyte model moss Physcomitrium patens by the generation and analysis of reporter and loss‐of‐function lines. The two genes are together essential for both male and female fertility by providing functions in the gamete‐producing inner cells of antheridia and archegonia. They are furthermore expressed in the diploid sporophyte generation suggesting a function during sporogenesis, a process proposed related by descent to pollen formation in angiosperms. We propose that the moss MS1/MMD1‐related regulatory network required for completion of male and female gametogenesis, and possibly for sporogenesis, represent a heritage from ancestral land plants.
    Keywords Arabidopsis ; Physcomitrium ; diploidy ; female fertility ; females ; gametogenesis ; gametophytes ; loss-of-function mutation ; males ; mosses and liverworts ; pollen ; sporophytes ; sporulation ; transcription (genetics)
    Language English
    Dates of publication 2022-10
    Size p. 512-524.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.18352
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Dependence on clade II bHLH transcription factors for nursing of haploid products by tapetal‐like cells is conserved between moss sporangia and angiosperm anthers

    Lopez‐Obando, Mauricio / Landberg, Katarina / Sundberg, Eva / Thelander, Mattias

    The new phytologist. 2022 July, v. 235, no. 2

    2022  

    Abstract: Clade II basic helix–loop–helix transcription factors (bHLH TFs) are essential for pollen production and tapetal nursing functions in angiosperm anthers. As pollen has been suggested to be related to bryophyte spores by descent, we characterized two ... ...

    Abstract Clade II basic helix–loop–helix transcription factors (bHLH TFs) are essential for pollen production and tapetal nursing functions in angiosperm anthers. As pollen has been suggested to be related to bryophyte spores by descent, we characterized two Physcomitrium (Physcomitrella) patens clade II bHLH TFs (PpbHLH092 and PpbHLH098), to test if regulation of sporogenous cells and the nursing cells surrounding them is conserved between angiosperm anthers and bryophyte sporangia. We made CRISPR‐Cas9 reporter and loss‐of‐function lines to address the function of PpbHLH092/098. We sectioned and analyzed WT and mutant sporophytes for a comprehensive stage‐by‐stage comparison of sporangium development. Spore precursors in the P. patens sporangium are surrounded by nursing cells showing striking similarities to tapetal cells in angiosperms. Moss clade II bHLH TFs are essential for the differentiation of these tapetal‐like cells and for the production of functional spores. Clade II bHLH TFs provide a conserved role in controlling the sporophytic somatic cells surrounding and nursing the sporogenous cells in both moss sporangia and angiosperm anthers. This supports the hypothesis that such nursing functions in mosses and angiosperms, lineages separated by c. 450 million years, are related by descent.
    Keywords Angiospermae ; CRISPR-Cas systems ; Physcomitrium ; haploidy ; loss-of-function mutation ; mosses and liverworts ; mutants ; pollen ; pollen productivity ; sporangia ; spores ; sporophytes
    Language English
    Dates of publication 2022-07
    Size p. 718-731.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.17972
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: MS1/MMD1 homologues in the moss Physcomitrium patens are required for male and female gametogenesis.

    Landberg, Katarina / Lopez-Obando, Mauricio / Sanchez Vera, Victoria / Sundberg, Eva / Thelander, Mattias

    The New phytologist

    2022  Volume 236, Issue 2, Page(s) 512–524

    Abstract: The Arabidopsis Plant HomeoDomain (PHD) proteins AtMS1 and AtMMD1 provide chromatin-mediated transcriptional regulation essential for tapetum-dependent pollen formation. This pollen-based male gametogenesis is a derived trait of seed plants. Male ... ...

    Abstract The Arabidopsis Plant HomeoDomain (PHD) proteins AtMS1 and AtMMD1 provide chromatin-mediated transcriptional regulation essential for tapetum-dependent pollen formation. This pollen-based male gametogenesis is a derived trait of seed plants. Male gametogenesis in the common ancestors of land plants is instead likely to have been reminiscent of that in extant bryophytes where flagellated sperms are produced by an elaborate gametophyte generation. Still, also bryophytes possess MS1/MMD1-related PHD proteins. We addressed the function of two MS1/MMD1-homologues in the bryophyte model moss Physcomitrium patens by the generation and analysis of reporter and loss-of-function lines. The two genes are together essential for both male and female fertility by providing functions in the gamete-producing inner cells of antheridia and archegonia. They are furthermore expressed in the diploid sporophyte generation suggesting a function during sporogenesis, a process proposed related by descent to pollen formation in angiosperms. We propose that the moss MS1/MMD1-related regulatory network required for completion of male and female gametogenesis, and possibly for sporogenesis, represent a heritage from ancestral land plants.
    MeSH term(s) Arabidopsis/genetics ; Bryopsida/genetics ; Bryopsida/metabolism ; Chromatin/metabolism ; Distal Myopathies ; Gametogenesis ; Gene Expression Regulation, Plant ; Muscular Atrophy ; Plants/genetics
    Chemical Substances Chromatin
    Language English
    Publishing date 2022-07-16
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.18352
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Minimal auxin sensing levels in vegetative moss stem cells revealed by a ratiometric reporter.

    Thelander, Mattias / Landberg, Katarina / Sundberg, Eva

    The New phytologist

    2019  Volume 224, Issue 2, Page(s) 775–788

    Abstract: Efforts to reveal ancestral functions of auxin, a key regulator of plant growth and development, and its importance for evolution have been hampered by a fragmented picture of auxin response domains in early-diverging land plants. We report the mapping ... ...

    Abstract Efforts to reveal ancestral functions of auxin, a key regulator of plant growth and development, and its importance for evolution have been hampered by a fragmented picture of auxin response domains in early-diverging land plants. We report the mapping of auxin sensing and responses during vegetative moss development using novel reporters. We established a moss-specific ratiometric reporter (PpR2D2) for Auxin Response Element- and AUXIN RESPONSE FACTOR-independent auxin sensing in Physcomitrella patens, and its readout during vegetative development was compared with new promoter-based GmGH3::GFPGUS and DR5revV2::GFPGUS auxin response reporters. The ratiometric reporter responds rapidly to auxin in a time-, dose- and TRANSPORT INHIBITOR RESISTANT1/AUXIN F-BOX-dependent manner and marks known, anticipated and novel auxin sensing domains. It reveals proximal auxin sensing maxima in filamentous tissues and sensing minima in all five vegetative gametophytic stem cell types as well as dividing cells. PpR2D2 readout is compliant with an ancestral function of auxin as a positive regulator of differentiation vs proliferation in stem cell regions. The PpR2D2 reporter is a sensitive tool for high-resolution mapping of auxin sensing, which can increase our knowledge of auxin function in early-diverging land plants substantially, thereby advancing our understanding of its importance for plant evolution.
    MeSH term(s) Amino Acids ; Bryophyta/metabolism ; Gene Expression Regulation, Plant/drug effects ; Gene Expression Regulation, Plant/physiology ; Genes, Reporter ; Indoleacetic Acids/metabolism ; Indoleacetic Acids/pharmacology ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Stem Cells/physiology
    Chemical Substances Amino Acids ; Indoleacetic Acids ; Plant Proteins ; indoleacetic acid (6U1S09C61L)
    Language English
    Publishing date 2019-08-16
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.16068
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Minimal auxin sensing levels in vegetative moss stem cells revealed by a ratiometric reporter

    Thelander, Mattias / Landberg, Katarina / Sundberg, Eva

    new phytologist. 2019 Oct., v. 224, no. 2

    2019  

    Abstract: Efforts to reveal ancestral functions of auxin, a key regulator of plant growth and development, and its importance for evolution have been hampered by a fragmented picture of auxin response domains in early‐diverging land plants. We report the mapping ... ...

    Abstract Efforts to reveal ancestral functions of auxin, a key regulator of plant growth and development, and its importance for evolution have been hampered by a fragmented picture of auxin response domains in early‐diverging land plants. We report the mapping of auxin sensing and responses during vegetative moss development using novel reporters. We established a moss‐specific ratiometric reporter (PpR2D2) for Auxin Response Element‐ and AUXIN RESPONSE FACTOR‐independent auxin sensing in Physcomitrella patens, and its readout during vegetative development was compared with new promoter‐based GmGH3::GFPGUS and DR5revV2::GFPGUS auxin response reporters. The ratiometric reporter responds rapidly to auxin in a time‐, dose‐ and TRANSPORT INHIBITOR RESISTANT1/AUXIN F‐BOX‐dependent manner and marks known, anticipated and novel auxin sensing domains. It reveals proximal auxin sensing maxima in filamentous tissues and sensing minima in all five vegetative gametophytic stem cell types as well as dividing cells. PpR2D2 readout is compliant with an ancestral function of auxin as a positive regulator of differentiation vs proliferation in stem cell regions. The PpR2D2 reporter is a sensitive tool for high‐resolution mapping of auxin sensing, which can increase our knowledge of auxin function in early‐diverging land plants substantially, thereby advancing our understanding of its importance for plant evolution.
    Keywords auxins ; embryophytes ; evolution ; gametophytes ; gene expression ; mosses and liverworts ; Physcomitrella patens ; plant development ; plant growth ; stem cells ; tissues ; transcription factors
    Language English
    Dates of publication 2019-10
    Size p. 775-788.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.16068
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Studies of moss reproductive development indicate that auxin biosynthesis in apical stem cells may constitute an ancestral function for focal growth control

    Landberg, Katarina / Šimura, Jan / Ljung, Karin / Sundberg, Eva / Thelander, Mattias

    new phytologist. 2021 Jan., v. 229, no. 2

    2021  

    Abstract: The plant hormone auxin is a key factor for regulation of plant development, and this function was probably reinforced during the evolution of early land plants. We have extended the available toolbox to allow detailed studies of how auxin biosynthesis ... ...

    Abstract The plant hormone auxin is a key factor for regulation of plant development, and this function was probably reinforced during the evolution of early land plants. We have extended the available toolbox to allow detailed studies of how auxin biosynthesis and responses are regulated in moss reproductive organs, their stem cells and gametes to better elucidate the function of auxin in the morphogenesis of early land plants. We measured auxin metabolites and identified IPyA (indole‐3‐pyruvic acid) as the main biosynthesis pathway in Physcomitrium (Physcomitrella) patens and established knock‐out, overexpressor and reporter lines for biosynthesis genes which were analyzed alongside previously reported auxin‐sensing and transport reporters. Vegetative and reproductive apical stem cells synthesize auxin. Sustained stem cell activity depends on an inability to sense the auxin produced while progeny of the stem cells respond to the auxin, aiding in the control of cell division, expansion and differentiation. Gamete precursors are dependent on a certain degree of auxin sensing, while the final differentiation is a low auxin‐sensing process. Tha data presented indicate that low auxin activity may represent a conserved hallmark of land plant gametes, and that local auxin biosynthesis in apical stem cells may be part of an ancestral mechanism to control focal growth.
    Keywords Physcomitrella ; Physcomitrium ; auxins ; biosynthesis ; cell division ; embryophytes ; evolution ; genes ; germ cells ; metabolites ; morphogenesis ; mosses and liverworts ; plant development ; plant hormones ; progeny ; stem cells
    Language English
    Dates of publication 2021-01
    Size p. 845-860.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note NAL-light ; JOURNAL ARTICLE
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.16914
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Studies of moss reproductive development indicate that auxin biosynthesis in apical stem cells may constitute an ancestral function for focal growth control.

    Landberg, Katarina / Šimura, Jan / Ljung, Karin / Sundberg, Eva / Thelander, Mattias

    The New phytologist

    2020  Volume 229, Issue 2, Page(s) 845–860

    Abstract: The plant hormone auxin is a key factor for regulation of plant development, and this function was probably reinforced during the evolution of early land plants. We have extended the available toolbox to allow detailed studies of how auxin biosynthesis ... ...

    Abstract The plant hormone auxin is a key factor for regulation of plant development, and this function was probably reinforced during the evolution of early land plants. We have extended the available toolbox to allow detailed studies of how auxin biosynthesis and responses are regulated in moss reproductive organs, their stem cells and gametes to better elucidate the function of auxin in the morphogenesis of early land plants. We measured auxin metabolites and identified IPyA (indole-3-pyruvic acid) as the main biosynthesis pathway in Physcomitrium (Physcomitrella) patens and established knock-out, overexpressor and reporter lines for biosynthesis genes which were analyzed alongside previously reported auxin-sensing and transport reporters. Vegetative and reproductive apical stem cells synthesize auxin. Sustained stem cell activity depends on an inability to sense the auxin produced while progeny of the stem cells respond to the auxin, aiding in the control of cell division, expansion and differentiation. Gamete precursors are dependent on a certain degree of auxin sensing, while the final differentiation is a low auxin-sensing process. Tha data presented indicate that low auxin activity may represent a conserved hallmark of land plant gametes, and that local auxin biosynthesis in apical stem cells may be part of an ancestral mechanism to control focal growth.
    MeSH term(s) Bryophyta ; Bryopsida/genetics ; Gene Expression Regulation, Plant ; Indoleacetic Acids ; Plant Growth Regulators ; Stem Cells
    Chemical Substances Indoleacetic Acids ; Plant Growth Regulators
    Language English
    Publishing date 2020-10-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.16914
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Auxin-mediated developmental control in the moss Physcomitrella patens

    Thelander, Mattias / Landberg, Katarina / Sundberg, Eva

    Journal of experimental botany. 2018 Jan. 04, v. 69, no. 2

    2018  

    Abstract: The signalling molecule auxin regulates many fundamental aspects of growth and development in plants. We review and discuss what is known about auxin-regulated development in mosses, with special emphasis on the model species Physcomitrella patens. It is ...

    Abstract The signalling molecule auxin regulates many fundamental aspects of growth and development in plants. We review and discuss what is known about auxin-regulated development in mosses, with special emphasis on the model species Physcomitrella patens. It is well established that mosses and other early diverging plants produce and respond to auxin. By sequencing the P. patens genome, it became clear that it encodes many core proteins important for auxin homeostasis, perception, and signalling, which have also been identified in flowering plants. This suggests that the auxin molecular network was present in the last common ancestor of flowering plants and mosses. Despite fundamental differences in their life cycles, key processes such as organ initiation and outgrowth, branching, tropic responses, as well as cell differentiation, division, and expansion appear to be regulated by auxin in the two lineages. This knowledge paves the way for studies aimed at a better understanding of the origin and evolution of auxin function and how auxin may have contributed to the evolution of land plants.
    Keywords Angiospermae ; Physcomitrella patens ; ancestry ; auxins ; branching ; cell differentiation ; embryophytes ; evolution ; genome ; homeostasis ; models ; mosses and liverworts ; proteins
    Language English
    Dates of publication 2018-0104
    Size p. 277-290.
    Publishing place Oxford University Press
    Document type Article
    ZDB-ID 2976-2
    ISSN 1460-2431 ; 0022-0957
    ISSN (online) 1460-2431
    ISSN 0022-0957
    DOI 10.1093/jxb/erx255
    Database NAL-Catalogue (AGRICOLA)

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