Seedling developmental defects upon blocking CINNAMATE-4-HYDROXYLASE are caused by perturbations in auxin transport

El Houari I, Van Beirs C, Arents H, Han H, Chanoca A, Opdenacker D, Pollier J, Storme V, Steenackers W, Quareshy M, Napier R, Beeckman T, Friml J, De Rybel B, Boerjan W, Vanholme B. 2021. Seedling developmental defects upon blocking CINNAMATE-4-HYDROXYLASE are caused by perturbations in auxin transport. New Phytologist. 230(6), 2275–2291.

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Journal Article | Published | English
Author
El Houari, I; Van Beirs, C; Arents, HE; Han, HuibinIST Austria; Chanoca, A; Opdenacker, D; Pollier, J; Storme, V; Steenackers, W; Quareshy, M; Napier, R; Beeckman, T
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Department
Abstract
• The phenylpropanoid pathway serves a central role in plant metabolism, providing numerous compounds involved in diverse physiological processes. Most carbon entering the pathway is incorporated into lignin. Although several phenylpropanoid pathway mutants show seedling growth arrest, the role for lignin in seedling growth and development is unexplored. • We use complementary pharmacological and genetic approaches to block CINNAMATE‐4‐HYDROXYLASE (C4H) functionality in Arabidopsis seedlings and a set of molecular and biochemical techniques to investigate the underlying phenotypes. • Blocking C4H resulted in reduced lateral rooting and increased adventitious rooting apically in the hypocotyl. These phenotypes coincided with an inhibition in auxin transport. The upstream accumulation in cis‐cinnamic acid was found to likely cause polar auxin transport inhibition. Conversely, a downstream depletion in lignin perturbed phloem‐mediated auxin transport. Restoring lignin deposition effectively reestablished phloem transport and, accordingly, auxin homeostasis. • Our results show that the accumulation of bioactive intermediates and depletion in lignin jointly cause the aberrant phenotypes upon blocking C4H, and demonstrate that proper deposition of lignin is essential for the establishment of auxin distribution in seedlings. Our data position the phenylpropanoid pathway and lignin in a new physiological framework, consolidating their importance in plant growth and development.
Publishing Year
Date Published
2021-03-17
Journal Title
New Phytologist
Volume
230
Issue
6
Page
2275-2291
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El Houari I, Van Beirs C, Arents H, et al. Seedling developmental defects upon blocking CINNAMATE-4-HYDROXYLASE are caused by perturbations in auxin transport. New Phytologist. 2021;230(6):2275-2291. doi:10.1111/nph.17349
El Houari, I., Van Beirs, C., Arents, H., Han, H., Chanoca, A., Opdenacker, D., … Vanholme, B. (2021). Seedling developmental defects upon blocking CINNAMATE-4-HYDROXYLASE are caused by perturbations in auxin transport. New Phytologist. Wiley. https://doi.org/10.1111/nph.17349
El Houari, I, C Van Beirs, HE Arents, Huibin Han, A Chanoca, D Opdenacker, J Pollier, et al. “Seedling Developmental Defects upon Blocking CINNAMATE-4-HYDROXYLASE Are Caused by Perturbations in Auxin Transport.” New Phytologist. Wiley, 2021. https://doi.org/10.1111/nph.17349.
I. El Houari et al., “Seedling developmental defects upon blocking CINNAMATE-4-HYDROXYLASE are caused by perturbations in auxin transport,” New Phytologist, vol. 230, no. 6. Wiley, pp. 2275–2291, 2021.
El Houari I, Van Beirs C, Arents H, Han H, Chanoca A, Opdenacker D, Pollier J, Storme V, Steenackers W, Quareshy M, Napier R, Beeckman T, Friml J, De Rybel B, Boerjan W, Vanholme B. 2021. Seedling developmental defects upon blocking CINNAMATE-4-HYDROXYLASE are caused by perturbations in auxin transport. New Phytologist. 230(6), 2275–2291.
El Houari, I., et al. “Seedling Developmental Defects upon Blocking CINNAMATE-4-HYDROXYLASE Are Caused by Perturbations in Auxin Transport.” New Phytologist, vol. 230, no. 6, Wiley, 2021, pp. 2275–91, doi:10.1111/nph.17349.

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