Abstract
Morphological root plasticity optimizes nutrient and water uptake by plants and is a promising target to improve tolerance to metal toxicity. Exposure to sublethal chromate [Cr(VI)] concentrations inhibits root growth, decreases photosynthesis and compromises plant development and productivity. Despite the increasing environmental problem that Cr(VI) represents, to date, the Cr tolerance mechanisms of plants are not well understood, and it remains to be investigated whether root architecture remodelling is important for plant adaptation to Cr(VI) stress. In this report, we analysed the growth response of Arabidopsis thaliana seedlings to concentrations of Cr(VI) that strongly repress primary and lateral root growth. Interestingly, adventitious roots started developing, branched and allowed seedlings to grow under highly growth-repressing Cr(VI) concentrations. Cr(VI) negatively regulates auxin transport and response gene expression in the primary root tip, as evidenced by decreased expression of auxin-related reporters DR5::GFP, DR5::uidA and PIN1::PIN1::GFP, and then, another auxin maximum is established at the site of adventitious root initiation that drives adventitious root organogenesis. Both primary root growth inhibition and adventitious root formation induced by high Cr(VI) levels are blocked by a gain-of-function mutation in the SOLITARY-ROOT/IAA14 gene of Arabidopsis. These data provide evidence that suggests a critical role for auxin transport and signalling via IAA14/SLR1 in the developmental program linking Cr(VI) to root architecture remodelling.
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Acknowledgments
We thank Peter Doerner, Athanasios Theologis, Thomas J. Guilfoyle, Bonnie Bartel, Masao Tasaka and Mark Estelle for kindly providing the seeds of the transgenic and mutant lines. Juan José Valdez Alarcón is appreciated for his permission to use the confocal microscope. This work was supported by grants from the Consejo Nacional de Ciencia y Tecnología (CONACYT, México, Grants No. 60999, 177775 and 169769), the Consejo de la Investigación Científica (UMSNH, México, Grant No. CIC 2.26) and the Marcos Moshinsky Foundation.
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Fig. S1
Effect of Cr(VI) on root system architecture. A. thaliana wild-type (Col-0) seedlings were grown on MS 0.2× agar-medium supplemented with the indicated concentration of Cr(VI). Note the inhibition of primary root growth and emergence of adventitious roots at high concentrations of Cr(VI). Photographs are representative individuals from at least 30 seedlings. Scale bar 500 µm. Supplementary material 1 (JPEG 281 kb)
Fig. S2
Effects of Cr(VI) on quiescent centre viability. Twelve-day-old A. thaliana seedlings expressing the QC46::uidA quiescent centre marker were grown on different concentrations of Cr(VI), and GUS expression was analysed in the primary root tip. Photographs are representative of individuals from at least 15 stained seedlings. The experiment was repeated twice with similar results. Scale bar 100 µm. Supplementary material 2 (JPEG 405 kb)
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López-Bucio, J., Ortiz-Castro, R., Ruíz-Herrera, L.F. et al. Chromate induces adventitious root formation via auxin signalling and SOLITARY-ROOT/IAA14 gene function in Arabidopsis thaliana . Biometals 28, 353–365 (2015). https://doi.org/10.1007/s10534-015-9838-8
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DOI: https://doi.org/10.1007/s10534-015-9838-8