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  1. Article ; Online: Extreme drought can deactivate ABA biosynthesis in embolism‐resistant species

    Mercado‐Reyes, Joel A. / Pereira, Talitha Soares / Manandhar, Anju / Rimer, Ian M. / McAdam, Scott A. M.

    Plant, Cell & Environment. 2024 Feb., v. 47, no. 2 p.497-510

    2024  

    Abstract: The phytohormone abscisic acid (ABA) is synthesised by plants during drought to close stomata and regulate desiccation tolerance pathways. Conifers and some angiosperms with embolism‐resistant xylem show a peaking‐type (p‐type) response in ABA levels, in ...

    Abstract The phytohormone abscisic acid (ABA) is synthesised by plants during drought to close stomata and regulate desiccation tolerance pathways. Conifers and some angiosperms with embolism‐resistant xylem show a peaking‐type (p‐type) response in ABA levels, in which ABA levels increase early in drought then decrease as drought progresses, declining to pre‐stressed levels. The mechanism behind this dynamic remains unknown. Here, we sought to characterise the mechanism driving p‐type ABA dynamics in the conifer Callitris rhomboidea and the highly drought‐resistant angiosperm Umbellularia californica. We measured leaf water potentials (Ψₗ), stomatal conductance, ABA, conjugates and phaseic acid (PA) levels in potted plants during a prolonged but non‐fatal drought. Both species displayed a p‐type ABA dynamic during prolonged drought. In branches collected before and after the peak in endogenous ABA levels in planta, that were rehydrated overnight and then bench dried, ABA biosynthesis was deactivated beyond leaf turgor loss point. Considerable conversion of ABA to conjugates was found to occur during drought, but not catabolism to PA. The mechanism driving the decline in ABA levels in p‐type species may be conserved across embolism‐resistant seed plants and is mediated by sustained conjugation of ABA and the deactivation of ABA accumulation as Ψₗ becomes more negative than turgor loss.
    Keywords Callitris ; Umbellularia californica ; abscisic acid ; biosynthesis ; catabolism ; conifers ; drought ; drought tolerance ; environment ; leaves ; phaseic acid ; stomatal conductance ; turgor ; xylem
    Language English
    Dates of publication 2024-02
    Size p. 497-510.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 391893-2
    ISSN 1365-3040 ; 0140-7791
    ISSN (online) 1365-3040
    ISSN 0140-7791
    DOI 10.1111/pce.14754
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Seeing is believing: what visualising bubbles in the xylem has revealed about plant hydraulic function

    Cardoso, Amanda A. / Kane, Cade N. / Rimer, Ian M. / McAdam, Scott A. M.

    Functional plant biology. 2022, v. 49, no. 9

    2022  

    Abstract: Maintaining water transport in the xylem is critical for vascular plants to grow and survive. The drought-induced accumulation of embolism, when gas enters xylem conduits, causes declines in hydraulic conductance (K) and is ultimately lethal. Several ... ...

    Abstract Maintaining water transport in the xylem is critical for vascular plants to grow and survive. The drought-induced accumulation of embolism, when gas enters xylem conduits, causes declines in hydraulic conductance (K) and is ultimately lethal. Several methods can be used to estimate the degree of embolism in xylem, from measuring K in tissues to directly visualising embolism in conduits. One method allowing a direct quantification of embolised xylem area is the optical vulnerability (OV) technique. This method has been used across different organs and has a high spatial and temporal resolution. Here, we review studies using the OV technique, discuss the main advantages and disadvantages of this method, and summarise key advances arising from its use. Vulnerability curves generated by the OV method are regularly comparable to other methods, including the centrifuge and X-ray microtomography. A major advantage of the OV technique over other methods is that it can be simultaneously used to determine in situ embolism formation in leaves, stems and roots, in species spanning the phylogeny of land plants. The OV method has been used to experimentally investigate the spreading of embolism through xylem networks, associate embolism with downstream tissue death, and observe embolism formation in the field.
    Keywords death ; embolism ; hydraulic conductivity ; micro-computed tomography ; phylogeny ; xylem
    Language English
    Size p. 759-772.
    Publishing place CSIRO Publishing
    Document type Article
    ZDB-ID 2071582-1
    ISSN 1445-4408
    ISSN 1445-4408
    DOI 10.1071/FP21326
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

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  3. Article ; Online: Seeing is believing: what visualising bubbles in the xylem has revealed about plant hydraulic function.

    Cardoso, Amanda A / Kane, Cade N / Rimer, Ian M / McAdam, Scott A M

    Functional plant biology : FPB

    2022  Volume 49, Issue 9, Page(s) 759–772

    Abstract: Maintaining water transport in the xylem is critical for vascular plants to grow and survive. The drought-induced accumulation of embolism, when gas enters xylem conduits, causes declines in hydraulic conductance (K ) and is ultimately lethal. Several ... ...

    Abstract Maintaining water transport in the xylem is critical for vascular plants to grow and survive. The drought-induced accumulation of embolism, when gas enters xylem conduits, causes declines in hydraulic conductance (K ) and is ultimately lethal. Several methods can be used to estimate the degree of embolism in xylem, from measuring K in tissues to directly visualising embolism in conduits. One method allowing a direct quantification of embolised xylem area is the optical vulnerability (OV) technique. This method has been used across different organs and has a high spatial and temporal resolution. Here, we review studies using the OV technique, discuss the main advantages and disadvantages of this method, and summarise key advances arising from its use. Vulnerability curves generated by the OV method are regularly comparable to other methods, including the centrifuge and X-ray microtomography. A major advantage of the OV technique over other methods is that it can be simultaneously used to determine in situ embolism formation in leaves, stems and roots, in species spanning the phylogeny of land plants. The OV method has been used to experimentally investigate the spreading of embolism through xylem networks, associate embolism with downstream tissue death, and observe embolism formation in the field.
    MeSH term(s) Droughts ; Embolism ; Water ; X-Ray Microtomography/methods ; Xylem
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2022-06-19
    Publishing country Australia
    Document type Journal Article ; Review ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2071582-1
    ISSN 1445-4416 ; 1445-4408
    ISSN (online) 1445-4416
    ISSN 1445-4408
    DOI 10.1071/FP21326
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  4. Article ; Online: Extreme drought can deactivate ABA biosynthesis in embolism-resistant species.

    Mercado-Reyes, Joel A / Pereira, Talitha Soares / Manandhar, Anju / Rimer, Ian M / McAdam, Scott A M

    Plant, cell & environment

    2023  Volume 47, Issue 2, Page(s) 497–510

    Abstract: The phytohormone abscisic acid (ABA) is synthesised by plants during drought to close stomata and regulate desiccation tolerance pathways. Conifers and some angiosperms with embolism-resistant xylem show a peaking-type (p-type) response in ABA levels, in ...

    Abstract The phytohormone abscisic acid (ABA) is synthesised by plants during drought to close stomata and regulate desiccation tolerance pathways. Conifers and some angiosperms with embolism-resistant xylem show a peaking-type (p-type) response in ABA levels, in which ABA levels increase early in drought then decrease as drought progresses, declining to pre-stressed levels. The mechanism behind this dynamic remains unknown. Here, we sought to characterise the mechanism driving p-type ABA dynamics in the conifer Callitris rhomboidea and the highly drought-resistant angiosperm Umbellularia californica. We measured leaf water potentials (Ψ
    MeSH term(s) Plant Stomata/physiology ; Droughts ; Plant Leaves/metabolism ; Abscisic Acid/metabolism ; Tracheophyta ; Water/metabolism ; Magnoliopsida/physiology ; Embolism
    Chemical Substances Abscisic Acid (72S9A8J5GW) ; Water (059QF0KO0R)
    Language English
    Publishing date 2023-10-31
    Publishing country United States
    Document type Journal Article
    ZDB-ID 391893-2
    ISSN 1365-3040 ; 0140-7791
    ISSN (online) 1365-3040
    ISSN 0140-7791
    DOI 10.1111/pce.14754
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 80/729: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article ; Online: Gradients in embolism resistance within stems driven by secondary growth in herbs.

    Haverroth, Eduardo J / Rimer, Ian M / Oliveira, Leonardo A / de Lima, Leydson G A / Cesarino, Igor / Martins, Samuel C V / McAdam, Scott A M / Cardoso, Amanda A

    Plant, cell & environment

    2024  

    Abstract: The stems of some herbaceous species can undergo basal secondary growth, leading to a continuum in the degree of woodiness along the stem. Whether the formation of secondary growth in the stem base results in differences in embolism resistance between ... ...

    Abstract The stems of some herbaceous species can undergo basal secondary growth, leading to a continuum in the degree of woodiness along the stem. Whether the formation of secondary growth in the stem base results in differences in embolism resistance between the base and the upper portions of stems is unknown. We assessed the embolism resistance of leaves and the basal and upper portions of stems simultaneously within the same individuals of two divergent herbaceous species that undergo secondary growth in the mature stem bases. The species were Solanum lycopersicum (tomato) and Senecio minimus (fireweed). Basal stem in mature plants of both species displayed advanced secondary growth and greater resistance to embolism than the upper stem. This also resulted in significant vulnerability segmentation between the basal stem and the leaves in both species. Greater embolism resistance in the woodier stem base was found alongside decreases in the pith-to-xylem ratio, increases in the proportion of secondary xylem, and increases in lignin content. We show that there can be considerable variation in embolism resistance across the stem in herbs and that this variation is linked to the degree of secondary growth present. A gradient in embolism resistance across the stem in herbaceous plants could be an adaptation to ensure reproduction or basal resprouting during episodes of drought late in the lifecycle.
    Language English
    Publishing date 2024-04-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 391893-2
    ISSN 1365-3040 ; 0140-7791
    ISSN (online) 1365-3040
    ISSN 0140-7791
    DOI 10.1111/pce.14921
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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