Boron toxicity in higher plants: an update

Landi, Marco; Margaritopoulou, Theoni; Papadakis, Ioannis; Araniti, Fabrizio

doi:10.1007/s00425-019-03220-4

Cited by 163 publications

(115 citation statements)

References 165 publications

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“…In contrast to boron deficiency, soil boron toxicity is less abundant and occurs in arid and semi-arid areas. Excessive soil boron was reported in Australia, US, Russia, Turkey, Mexico, Israel, Iraq, Egypt, Syria, Morocco, Jordan, Libya, India, Pakistan, Malaysia, Peru, Chile, Hungary, Serbia, and Italy [76,[129][130][131][132].…”

Section: Sources Of Boronmentioning

confidence: 99%

Boron Toxicity and Deficiency in Agricultural Plants

Brdar-Jokanović

2020

IJMS

271

119

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Boron is an essential plant micronutrient taken up via the roots mostly in the form of boric acid. Its important role in plant metabolism involves the stabilization of molecules with cis-diol groups. The element is involved in the cell wall and membrane structure and functioning; therefore, it participates in numerous ion, metabolite, and hormone transport reactions. Boron has an extremely narrow range between deficiency and toxicity, and inadequate boron supply exhibits a detrimental effect on the yield of agricultural plants. The deficiency problem can be solved by fertilization, whereas soil boron toxicity can be ameliorated using various procedures; however, these approaches are costly and time-consuming, and they often show temporary effects. Plant species, as well as the genotypes within the species, dramatically differ in terms of boron requirements; thus, the available soil boron which is deficient for one crop may exhibit toxic effects on another. The widely documented intraspecies genetic variability regarding boron utilization efficiency and toxicity tolerance, together with the knowledge of the physiology and genetics of boron, should result in the development of efficient and tolerant varieties that may represent a long-term sustainable solution for the problem of inadequate or excess boron supply.

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Section: Sources Of Boronmentioning

confidence: 99%

Boron Toxicity and Deficiency in Agricultural Plants

Brdar-Jokanović

2020

IJMS

271

119

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“…Conversely, treatment of sunflower with BA stimulates adventitious root growth [18]. While there are benefits to increased B, too much is toxic and levels must be carefully controlled by the plant [19,20].…”

Section: Introductionmentioning

confidence: 99%

Assessment of a 18F-Phenylboronic Acid Radiotracer for Imaging Boron in Maize

Housh

Matthes

Gerheart

et al. 2020

IJMS

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Boron (B) is an essential plant micronutrient. Deficiencies of B have drastic consequences on plant development leading to crop yield losses and reductions in root and shoot growth. Understanding the molecular and cellular consequences of B deficiency is challenging, partly because of the limited availability of B imaging techniques. In this report we demonstrate the efficacy of using 4-fluorophenylboronic acid (FPBA) as a B imaging agent, which is a derivative of the B deficiency mimic phenylboronic acid (PBA). We show that radioactively labelled [18F]FPBA (t½=110 m) accumulates at the root tip, the root elongation zone and at lateral root initiation sites in maize roots, and also translocates to the shoot where it accumulates along the leaf edges. Treatment of maize seedlings using FPBA and PBA causes a shortened primary root phenotype with absence of lateral roots in a dose-dependent manner. The primary root defects can be partially rescued by the addition of boric acid indicating that PBA can be used to induce B deficiency in maize and that radioactively labelled FPBA can be used to image sites of B demand on a tissue level.

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“…At physiological pH, boron primarily exists as uncharged boric acid, which is highly membrane permeable (Reid, 2014). Boric acid readily diffuses into the root cells under adequate or excess boron conditions (Yoshinari and Takano, 2017;Landi et al, 2019;Princi et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…In 1899 the eminent botanist Edwin Copeland stated that "boron produced monstrosity" to describe plant damage due to excess boron (Copeland and Kahlenberg, 1899). Boron functions as an essential micronutrient in plants at a narrow concentration range (0.5 -1 ppm, equivalent to 46.2 -92.5 µM in hydroponic media), causing severe growth defects in many plants, including most crops, at only slightly higher concentrations (Brenchley, 1914;Haas, 1929;Warington, 1937;Eaton, 1940;Goldberg, 1997;Reid, 2007Reid, , 2013Julkowska, 2018;Landi et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Cross species multi-omics reveals cell wall sequestration and elevated global transcription as mechanisms of boron tolerance in plants

Wang

DiTusa

et al. 2020

Preprint

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Boron toxicity is a worldwide problem for crop production, yet we have only a limited understanding of the genetic responses and adaptive mechanisms to this environmental stress in plants. Here we identified responses to excess boron in boron stress-sensitive Arabidopsis thaliana and its boron stress-tolerant extremophyte relative Schrenkiella parvula using comparative genomics, transcriptomics, metabolomics, and ionomics. S. parvula maintains a lower level of total boron and free boric acid in its roots and shoots and sustains growth for longer durations than A. thaliana when grown with excess boron. S. parvula likely excludes boron more efficiently than A. thaliana, which we propose is partly driven by BOR5, a boron transporter that we functionally characterized in the current study. Both species allocate significant transcriptomic and metabolomic resources to enable their cell walls to serve as a partial sink for excess boron, particularly discernable in A. thaliana shoots. We provide evidence that the S. parvula transcriptome is pre-adapted to boron toxicity, exhibiting substantial overlap with the boron-stressed transcriptome of A. thaliana. Our transcriptomic and metabolomics data also suggest that RNA metabolism is a primary target of boron toxicity. Cytoplasmic boric acid likely forms complexes with ribose and ribose-containing compounds critical to RNA and other primary metabolic functions. A model depicting some of the cellular responses that enable a plant to grow in the presence of normally toxic levels of boron is presented.

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Boron toxicity in higher plants: an update

Abstract: Main conclusion In this review, emphasis is given to the most recent updates about morpho-anatomical, physiological, biochemical and molecular responses adopted by plants to cope with B excess.

Cited by 163 publications

References 165 publications

Boron Toxicity and Deficiency in Agricultural Plants

Boron Toxicity and Deficiency in Agricultural Plants

Assessment of a 18F-Phenylboronic Acid Radiotracer for Imaging Boron in Maize

Cross species multi-omics reveals cell wall sequestration and elevated global transcription as mechanisms of boron tolerance in plants

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