Low ABA concentration promotes root growth and hydrotropism through relief of ABA INSENSITIVE 1-mediated inhibition of plasma membrane H
            <sup>+</sup>
            -ATPase 2

Miao, Rui; Yuan, Wei; Wang, Yue; García-Maquilón, Irene; Dang, Xiaolin; Liu, Ying; Zhang, Jianhua; Zhu, Yiyong; Rodriguez, Pedro L.

doi:10.1126/sciadv.abd4113

Cited by 100 publications

(98 citation statements)

References 92 publications

(136 reference statements)

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“…MIZ1 is also required for the hydrotropism-related asymmetric cytokinin redistribution. Furthermore, low ABA concentrations can induce root growth and promote hydrotropism by inhibiting the activity of PP2C phosphatases and enhancing the root apoplastic H + efflux via H + -ATPase2 in both salt and drought conditions ( Miao et al, 2021 ).…”

Section: Tropisms and Root Branchingmentioning

confidence: 99%

Root plasticity under abiotic stress

et al. 2021

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Abiotic stresses increasingly threaten existing ecological and agricultural systems across the globe. Plant roots perceive these stresses in the soil and adapt their architecture accordingly. This review provides insights into recent discoveries showing the importance of root system architecture and plasticity for the survival and development of plants under heat, cold, drought, salt, and flooding stress. In addition, we review the molecular regulation and hormonal pathways involved in controlling root system architecture plasticity, main root growth, branching and lateral root growth, root hair development and formation of adventitious roots. Several stresses affect root anatomy by causing aerenchyma formation, lignin and suberin deposition, and Casparian strip modulation. Roots can also actively grow towards favourable soil conditions and avoid environments detrimental to their development. Recent advances in understanding the cellular mechanisms behind these different root tropisms are discussed. Understanding root plasticity will be instrumental for the development of crops that are resilient in the face of abiotic stress.

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Section: Tropisms and Root Branchingmentioning

confidence: 99%

Root plasticity under abiotic stress

et al. 2021

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“…Approximately 500 mg of each sample was rapidly frozen in liquid nitrogen. The extraction and quantification of endogenous ACC (ethylene precursors) and JA were performed using an LC-ESI-MS/MS system (UPLC, Shim-pack UFLC SHIMADZU CBM30A system, http://www.shimadzu.com.cn/, access date 12 October 2021, Kyoto, Japan; MS/MS, Applied Biosystems, Foster City, CA, 6500 Quadrupole Trap, http://www.appliedbiosystems.com.cn/, access date 12 October 2021) by Wuhan Metware Biotechnology Co., Ltd. (Wuhan, China) [115][116][117][118][119].…”

Section: Phytohormone Quantificationmentioning

confidence: 99%

Light Deficiency Inhibits Growth by Affecting Photosynthesis Efficiency as well as JA and Ethylene Signaling in Endangered Plant Magnolia sinostellata

Lu¹,

Liu

Ren³

et al. 2021

Plants

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The endangered plant Magnolia sinostellata largely grows in the understory of forest and suffers light deficiency stress. It is generally recognized that the interaction between plant development and growth environment is intricate; however, the underlying molecular regulatory pathways by which light deficiency induced growth inhibition remain obscure. To understand the physiological and molecular mechanisms of plant response to shading caused light deficiency, we performed photosynthesis efficiency analysis and comparative transcriptome analysis in M. sinostellata leaves, which were subjected to shading treatments of different durations. Most of the parameters relevant to the photosynthesis systems were altered as the result of light deficiency treatment, which was also confirmed by the transcriptome analysis. Gene Ontology and KEGG pathway enrichment analyses illustrated that most of differential expression genes (DEGs) were enriched in photosynthesis-related pathways. Light deficiency may have accelerated leaf abscission by impacting the photosynthesis efficiency and hormone signaling. Further, shading could repress the expression of stress responsive transcription factors and R-genes, which confer disease resistance. This study provides valuable insight into light deficiency-induced molecular regulatory pathways in M. sinostellata and offers a theoretical basis for conservation and cultivation improvements of Magnolia and other endangered woody plants.

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“…ABA plays an important role in several biological processes, including seed development and dormancy, germination, vegetative growth, modulation of root architecture, leaf senescence, stomata regulation, and the response to various biotic and abiotic stresses (Finkelstein et al, 2002;Nambara and Marion-Poll, 2005;Merilo et al, 2015;Cui et al, 2016;Gao et al, 2016;Shu et al, 2016;Wang et al, 2020b;Chen et al, 2020;Miao et al, 2021). In the classic plant ABA biosynthesis pathway, b-carotene is hydroxylated into zeaxanthin by NON-HEME DIIRON OXIDASE (HYD) or CYP97A (Sun et al, 1996;Kim and DellaPenna, 2006).…”

Section: Discussionmentioning

confidence: 99%

An alternative, zeaxanthin epoxidase-independent abscisic acid biosynthetic pathway in plants

Jia

Ali

et al. 2022

Molecular Plant

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Abscisic acid (ABA) is an important carotenoid-derived phytohormone that plays essential roles in plant response to biotic and abiotic stresses as well as in various physiological and developmental processes. In Arabidopsis, ABA biosynthesis starts with the epoxidation of zeaxanthin by the ABA DEFICIENT 1 (ABA1) enzyme, leading to epoxycarotenoids; e.g., violaxanthin. The oxidative cleavage of 9-cis-epoxycarotenoids, a key regulatory step catalyzed by 9-CIS-EPOXYCAROTENOID DIOXYGENASE, forms xanthoxin, which is converted in further reactions mediated by ABA DEFICIENT 2 (ABA2), ABA DEFICIENT 3 (ABA3), and ABSCISIC ALDEHYDE OXIDASE 3 (AAO3) into ABA. By combining genetic and biochemical approaches, we unravel here an ABA1-independent ABA biosynthetic pathway starting upstream of zeaxanthin. We identified the carotenoid cleavage products (i.e., apocarotenoids, b-apo-11-carotenal, 9-cis-b-apo-11-carotenal, 3-OH-b-apo-11-carotenal, and 9-cis-3-OH-b-apo-11-carotenal) as intermediates of this ABA1-independent ABA biosynthetic pathway. Using labeled compounds, we showed that b-apo-11-carotenal, 9-cis-b-apo-11-carotenal, and 3-OH-b-apo-11-carotenal are successively converted into 9-cis-3-OH-b-apo-11carotenal, xanthoxin, and finally into ABA in both Arabidopsis and rice. When applied to Arabidopsis, these b-apo-11-carotenoids exert ABA biological functions, such as maintaining seed dormancy and inducing the expression of ABA-responsive genes. Moreover, the transcriptomic analysis revealed a high overlap of differentially expressed genes regulated by b-apo-11-carotenoids and ABA, suggesting that b-apo-11-carotenoids exert ABA-independent regulatory activities. Taken together, our study identifies a biological function for the common plant metabolites, b-apo-11-carotenoids, extends our knowledge about ABA biosynthesis, and provides new insights into plant apocarotenoid metabolic networks.

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Low ABA concentration promotes root growth and hydrotropism through relief of ABA INSENSITIVE 1-mediated inhibition of plasma membrane H ⁺ -ATPase 2

Cited by 100 publications

References 92 publications

Root plasticity under abiotic stress

Root plasticity under abiotic stress

Light Deficiency Inhibits Growth by Affecting Photosynthesis Efficiency as well as JA and Ethylene Signaling in Endangered Plant Magnolia sinostellata

An alternative, zeaxanthin epoxidase-independent abscisic acid biosynthetic pathway in plants

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Low ABA concentration promotes root growth and hydrotropism through relief of ABA INSENSITIVE 1-mediated inhibition of plasma membrane H + -ATPase 2

Cited by 100 publications

References 92 publications

Root plasticity under abiotic stress

Root plasticity under abiotic stress

Light Deficiency Inhibits Growth by Affecting Photosynthesis Efficiency as well as JA and Ethylene Signaling in Endangered Plant Magnolia sinostellata

An alternative, zeaxanthin epoxidase-independent abscisic acid biosynthetic pathway in plants

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Low ABA concentration promotes root growth and hydrotropism through relief of ABA INSENSITIVE 1-mediated inhibition of plasma membrane H ⁺ -ATPase 2