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Phenylboronic acid interacts with pectic rhamnogalacturonan-II and displays anti-auxinic effects during Arabidopsis thaliana root growth and development. | LitMetric

AI Article Synopsis

  • Boron is essential for the dimerization of RG-II, which is crucial for plant cell elongation, but studying RG-II mutants is difficult due to severe growth issues.
  • Research using phenylboronic acid (PBA) on Arabidopsis thaliana seedlings revealed that while PBA alters root development, it does not affect RG-II dimerization or distribution.
  • PBA treatment disrupts auxin levels, explaining the lack of lateral roots, and indicates that PBA impacts both RG-II dimerization and various other boron-related functions in plants.

Article Abstract

Boron dimerizes RG-II in the plant cell wall and is crucial for plant cell elongation. However, studying RG-II dimerization in plants is challenging because of the severe phenotypes or lethality of RG-II mutants. Boron deprivation abrogates both RG-II dimerization and plant growth, but whether or how these phenotypes are functionally linked has remained unclear. Boric acid analogues can serve as experimental tools to interfere with RG-II cross-linking. Here, we investigated RG-II dimerization and developmental phenotypes in Arabidopsis thaliana seedlings treated with a boric acid analogue, phenylboronic acid (PBA), to test whether the observed developmental phenotypes are attributable to alteration of RG-II dimerization or to other putative functions of boron in plants. We found that PBA treatment altered root development in seedlings while RG-II dimerization and distribution were not affected. Surprisingly, under low boron conditions, PBA treatment i) had no effect on root size but still prevented lateral root development and ii) restored RG-II dimerization. PBA treatment also disrupted auxin levels, potentially explaining the absence of lateral roots in seedlings treated with this analogue. We conclude that PBA interacts both with RG-II and other cellular targets such as auxin signaling components, and that the phenotypes caused by PBA arise from interference with multiple functions of boron.

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Source
http://dx.doi.org/10.1093/jxb/erae315DOI Listing

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