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  1. Article ; Online: Apocarotenoid signals in plant development and beyond.

    McQuinn, Ryan P / Waters, Mark T

    Journal of experimental botany

    2024  Volume 75, Issue 4, Page(s) 1131–1133

    MeSH term(s) Plant Development ; Plants ; Gene Expression Regulation, Plant
    Language English
    Publishing date 2024-02-12
    Publishing country England
    Document type Journal Article
    ZDB-ID 2976-2
    ISSN 1460-2431 ; 0022-0957
    ISSN (online) 1460-2431
    ISSN 0022-0957
    DOI 10.1093/jxb/erae024
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  2. Article ; Online: From little things big things grow: karrikins and new directions in plant development.

    Waters, Mark T

    Functional plant biology : FPB

    2020  Volume 44, Issue 4, Page(s) 373–385

    Abstract: Karrikins are a family of compounds generated via the incomplete combustion of plant matter. Since their discovery as seed germination stimulants in 2004, a great deal has been learned about the chemistry and the biological mode of action of karrikins. ... ...

    Abstract Karrikins are a family of compounds generated via the incomplete combustion of plant matter. Since their discovery as seed germination stimulants in 2004, a great deal has been learned about the chemistry and the biological mode of action of karrikins. Much interest and progress have stemmed from the structural similarity of karrikins to that of strigolactones - the shoot branching hormone. This review will provide a historical account of some of the more significant discoveries in this area of plant biology. It will discuss how the study of these abiotic signalling molecules, combined with advances in our understanding of strigolactones, has led us towards the discovery of new mechanisms that regulate plant growth and development.
    Language English
    Publishing date 2020-06-02
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2071582-1
    ISSN 1445-4416 ; 1445-4408
    ISSN (online) 1445-4416
    ISSN 1445-4408
    DOI 10.1071/FP16405
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  3. Article ; Online: Karrikin perception and signalling.

    Waters, Mark T / Nelson, David C

    The New phytologist

    2022  Volume 237, Issue 5, Page(s) 1525–1541

    Abstract: Karrikins (KARs) are a class of butenolide compounds found in smoke that were first identified as seed germination stimulants for fire-following species. Early studies of KARs classified the germination and postgermination responses of many plant species ...

    Abstract Karrikins (KARs) are a class of butenolide compounds found in smoke that were first identified as seed germination stimulants for fire-following species. Early studies of KARs classified the germination and postgermination responses of many plant species and investigated crosstalk with plant hormones that regulate germination. The discovery that Arabidopsis thaliana responds to KARs laid the foundation for identifying mutants with altered KAR responses. Genetic analysis of KAR signalling revealed an unexpected link to strigolactones (SLs), a class of carotenoid-derived plant hormones. Substantial progress has since been made towards understanding how KARs are perceived and regulate plant growth, in no small part due to advances in understanding SL perception. KAR and SL signalling systems are evolutionarily related and retain a high degree of similarity. There is strong evidence that KARs are natural analogues of an endogenous signal(s), KAI2 ligand (KL), which remains unknown. KAR/KL signalling regulates many developmental processes in plants including germination, seedling photomorphogenesis, and root and root hair growth. KAR/KL signalling also affects abiotic stress responses and arbuscular mycorrhizal symbiosis. Here, we summarise the current knowledge of KAR/KL signalling and discuss current controversies and unanswered questions in this field.
    MeSH term(s) Plant Growth Regulators ; Arabidopsis Proteins/genetics ; Hydrolases ; Arabidopsis/genetics ; Furans ; Pyrans ; Perception ; Lactones/pharmacology
    Chemical Substances 3-methyl-2H-furo(2,3-c)pyran-2-one ; Plant Growth Regulators ; Arabidopsis Proteins ; Hydrolases (EC 3.-) ; Furans ; Pyrans ; Lactones
    Language English
    Publishing date 2022-12-07
    Publishing country England
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.18598
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  4. Article ; Online: Karrikin signalling: impacts on plant development and abiotic stress tolerance.

    Kamran, Muhammad / Melville, Kim T / Waters, Mark T

    Journal of experimental botany

    2023  Volume 75, Issue 4, Page(s) 1174–1186

    Abstract: Plants rely upon a diverse range of metabolites to control growth and development, and to overcome stress that results from suboptimal conditions. Karrikins (KARs) are a class of butenolide compounds found in smoke that stimulate seed germination and ... ...

    Abstract Plants rely upon a diverse range of metabolites to control growth and development, and to overcome stress that results from suboptimal conditions. Karrikins (KARs) are a class of butenolide compounds found in smoke that stimulate seed germination and regulate various developmental processes in plants. KARs are perceived via a plant α/β-hydrolase called KARRIKIN INSENSITIVE2 (KAI2), which also functions as a receptor for a postulated phytohormone, provisionally termed KAI2 ligand (KL). Considered natural analogues of KL, KARs have been extensively studied for their effects on plant growth and their crosstalk with plant hormones. The perception and response pathway for KAR-KL signalling is closely related to that of strigolactones, another class of butenolides with numerous functions in regulating plant growth. KAR-KL signalling influences seed germination, seedling photomorphogenesis, root system architecture, abiotic stress responses, and arbuscular mycorrhizal symbiosis. Here, we summarize current knowledge of KAR-KL signalling, focusing on its role in plant development, its effects on stress tolerance, and its interaction with other signalling mechanisms.
    MeSH term(s) Plant Development ; Furans/metabolism ; Plant Growth Regulators/metabolism ; Stress, Physiological ; Arabidopsis Proteins/metabolism ; Lactones/metabolism ; Pyrans ; 4-Butyrolactone/analogs & derivatives
    Chemical Substances 3-methyl-2H-furo(2,3-c)pyran-2-one ; Furans ; Plant Growth Regulators ; butenolide (8KXK25H388) ; Arabidopsis Proteins ; Lactones ; Pyrans ; 4-Butyrolactone (OL659KIY4X)
    Language English
    Publishing date 2023-11-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 2976-2
    ISSN 1460-2431 ; 0022-0957
    ISSN (online) 1460-2431
    ISSN 0022-0957
    DOI 10.1093/jxb/erad476
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  5. Article ; Online: Spoilt for Choice: New Options for Inhibitors of Strigolactone Signaling.

    Waters, Mark T

    Molecular plant

    2018  Volume 12, Issue 1, Page(s) 21–23

    MeSH term(s) Arabidopsis ; Germination ; Signal Transduction ; Triazoles ; Urea
    Chemical Substances Triazoles ; Urea (8W8T17847W)
    Language English
    Publishing date 2018-12-01
    Publishing country England
    Document type Journal Article ; Comment
    ZDB-ID 2393618-6
    ISSN 1752-9867 ; 1674-2052
    ISSN (online) 1752-9867
    ISSN 1674-2052
    DOI 10.1016/j.molp.2018.11.012
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  6. Article: A Toxic Sterolysin From a 1950s Culture of Gymnodinium Veneficum Ballantine.

    Place, Allen R / Ramos-Franco, Josefina / Waters, Amanda L / Hamann, Mark T

    Research square

    2024  

    Abstract: In 1957 Abbott and Ballentine described a highly toxic activity from a dinoflagellate isolated from the English Channel. in 1949 by Mary Park. From a culture maintained at Plymouth Laboratory since 1950, we have been able to isolate two toxic molecules ( ... ...

    Abstract In 1957 Abbott and Ballentine described a highly toxic activity from a dinoflagellate isolated from the English Channel. in 1949 by Mary Park. From a culture maintained at Plymouth Laboratory since 1950, we have been able to isolate two toxic molecules (Abbotoxin and 59-E-Chloro-Abbotoxin), determine the planar structures by analysis of HRMS and 1D and 2D NMR spectra and found them to be karlotoxin (KmTx) congeners. Both toxins kill larval zebrafish with symptoms identical to that described by Abbot and Ballantine for gobies (
    Language English
    Publishing date 2024-03-25
    Publishing country United States
    Document type Preprint
    DOI 10.21203/rs.3.rs-3970188/v1
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  7. Article ; Online: Karrikin perception and signalling

    Waters, Mark T. / Nelson, David C.

    New Phytologist. 2023 Mar., v. 237, no. 5 p.1525-1541

    2023  

    Abstract: Karrikins (KARs) are a class of butenolide compounds found in smoke that were first identified as seed germination stimulants for fire‐following species. Early studies of KARs classified the germination and postgermination responses of many plant species ...

    Abstract Karrikins (KARs) are a class of butenolide compounds found in smoke that were first identified as seed germination stimulants for fire‐following species. Early studies of KARs classified the germination and postgermination responses of many plant species and investigated crosstalk with plant hormones that regulate germination. The discovery that Arabidopsis thaliana responds to KARs laid the foundation for identifying mutants with altered KAR responses. Genetic analysis of KAR signalling revealed an unexpected link to strigolactones (SLs), a class of carotenoid‐derived plant hormones. Substantial progress has since been made towards understanding how KARs are perceived and regulate plant growth, in no small part due to advances in understanding SL perception. KAR and SL signalling systems are evolutionarily related and retain a high degree of similarity. There is strong evidence that KARs are natural analogues of an endogenous signal(s), KAI2 ligand (KL), which remains unknown. KAR/KL signalling regulates many developmental processes in plants including germination, seedling photomorphogenesis, and root and root hair growth. KAR/KL signalling also affects abiotic stress responses and arbuscular mycorrhizal symbiosis. Here, we summarise the current knowledge of KAR/KL signalling and discuss current controversies and unanswered questions in this field.
    Keywords Arabidopsis thaliana ; abiotic stress ; genetic analysis ; karrikins ; ligands ; photomorphogenesis ; plant growth ; root hairs ; seed germination ; seedlings ; smoke ; strigolactones ; vesicular arbuscular mycorrhizae
    Language English
    Dates of publication 2023-03
    Size p. 1525-1541.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note REVIEW
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.18598
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  8. Article ; Online: Perception of butenolides by Bacillus subtilis via the α/β hydrolase RsbQ.

    Melville, Kim T / Kamran, Muhammad / Yao, Jiaren / Costa, Marianne / Holland, Madeleine / Taylor, Nicolas L / Fritz, Georg / Flematti, Gavin R / Waters, Mark T

    Current biology : CB

    2024  Volume 34, Issue 3, Page(s) 623–631.e6

    Abstract: The regulation of behavioral and developmental decisions by small molecules is common to all domains of life. In plants, strigolactones and karrikins are butenolide growth regulators that influence several aspects of plant growth and development, as well ...

    Abstract The regulation of behavioral and developmental decisions by small molecules is common to all domains of life. In plants, strigolactones and karrikins are butenolide growth regulators that influence several aspects of plant growth and development, as well as interactions with symbiotic fungi.
    MeSH term(s) Hydrolases/genetics ; Bacillus subtilis ; 4-Butyrolactone ; Lactones/chemistry ; Perception ; Arabidopsis Proteins/genetics ; Plant Growth Regulators
    Chemical Substances butenolide (8KXK25H388) ; Hydrolases (EC 3.-) ; 4-Butyrolactone (OL659KIY4X) ; Lactones ; Arabidopsis Proteins ; Plant Growth Regulators
    Language English
    Publishing date 2024-01-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 1071731-6
    ISSN 1879-0445 ; 0960-9822
    ISSN (online) 1879-0445
    ISSN 0960-9822
    DOI 10.1016/j.cub.2023.12.035
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  9. Article ; Online: Perception of karrikins by plants: a continuing enigma.

    Yao, Jiaren / Waters, Mark T

    Journal of experimental botany

    2020  Volume 71, Issue 6, Page(s) 1774–1781

    Abstract: Karrikins are small butenolide molecules with the capacity to promote germination and enhance seedling establishment. Generated abiotically from partial combustion of vegetation, karrikins are comparatively rare in the environment, but studying their ... ...

    Abstract Karrikins are small butenolide molecules with the capacity to promote germination and enhance seedling establishment. Generated abiotically from partial combustion of vegetation, karrikins are comparatively rare in the environment, but studying their mode of action has been most informative in revealing a new regulatory pathway for plant development that uses the karrikin perception machinery. Recent studies suggest that the karrikin receptor protein KAI2 and downstream transcriptional co-repressors in the SMXL family influence seed germination, seedling photomorphogenesis, root morphology, and responses to abiotic stress such as drought. Based on taxonomic distribution, this pathway is ubiquitous and likely to be evolutionarily ancient, originating prior to land plants. However, we still do not have a good grasp on how karrikins actually activate the receptor protein, and we have yet to discover the assumed endogenous ligand for KAI2 that karrikins are thought to mimic. This review covers recent progress in this field, as well as current gaps in our knowledge.
    MeSH term(s) Arabidopsis ; Arabidopsis Proteins ; Furans ; Germination ; Hydrolases ; Lactones ; Perception
    Chemical Substances Arabidopsis Proteins ; Furans ; Lactones ; Hydrolases (EC 3.-)
    Language English
    Publishing date 2020-02-18
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2976-2
    ISSN 1460-2431 ; 0022-0957
    ISSN (online) 1460-2431
    ISSN 0022-0957
    DOI 10.1093/jxb/erz548
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  10. Article: From little things big things grow: karrikins and new directions in plant development

    Waters, Mark T

    Functional plant biology. 2017, v. 44, no. 4

    2017  

    Abstract: Karrikins are a family of compounds generated via the incomplete combustion of plant matter. Since their discovery as seed germination stimulants in 2004, a great deal has been learned about the chemistry and the biological mode of action of karrikins. ... ...

    Abstract Karrikins are a family of compounds generated via the incomplete combustion of plant matter. Since their discovery as seed germination stimulants in 2004, a great deal has been learned about the chemistry and the biological mode of action of karrikins. Much interest and progress have stemmed from the structural similarity of karrikins to that of strigolactones – the shoot branching hormone. This review will provide a historical account of some of the more significant discoveries in this area of plant biology. It will discuss how the study of these abiotic signalling molecules, combined with advances in our understanding of strigolactones, has led us towards the discovery of new mechanisms that regulate plant growth and development.
    Keywords branching ; chemical elements ; combustion ; mechanism of action ; plant growth ; seed germination ; strigolactones
    Language English
    Size p. 373-385.
    Publishing place CSIRO Publishing
    Document type Article
    ZDB-ID 2071582-1
    ISSN 1445-4408
    ISSN 1445-4408
    DOI 10.1071/FP16405
    Database NAL-Catalogue (AGRICOLA)

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