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Diverging cell wall strategies for drought adaptation in two maize inbreds with contrasting lodging resistance.
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  • Silvia Calderone,
  • Nuria Mauri,
  • Alba Manga-Robles,
  • Silvia Fornalé,
  • Lluís García-Mir,
  • María-Luz Centeno,
  • Camila Sánchez-Retuerta,
  • Robertas Ursache,
  • José-Luis Acebes,
  • Narciso Campos,
  • Penélope García-Angulo,
  • Antonio Encina,
  • David Caparrós-Ruiz
Silvia Calderone
Center for Research in Agricultural Genomics
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Nuria Mauri
Center for Research in Agricultural Genomics
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Alba Manga-Robles
Universidad de Leon
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Silvia Fornalé
Center for Research in Agricultural Genomics
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Lluís García-Mir
Center for Research in Agricultural Genomics
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María-Luz Centeno
Universidad de Leon
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Camila Sánchez-Retuerta
Center for Research in Agricultural Genomics
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Robertas Ursache
Center for Research in Agricultural Genomics
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José-Luis Acebes
Universidad de Leon
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Narciso Campos
Center for Research in Agricultural Genomics
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Penélope García-Angulo
Universidad de Leon
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Antonio Encina
Universidad de Leon
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David Caparrós-Ruiz
Center for Research in Agricultural Genomics

Corresponding Author:[email protected]

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Abstract

The plant cell wall is a plastic structure of variable composition that constitutes the first line of defense against environmental challenges. Lodging and drought are two stressful conditions that severely impact on maize yield. In a previous work, we characterized the cell walls of two maize inbreds susceptible (EA2024) or resistant (B73) to stalk-lodging. Here, we show that drought induces phenotypical, physiological, cell wall, and transcriptional changes with distinct dynamics in the two inbreds, and that B73 is less tolerant than EA2024 to this stress. While in control conditions, stalk of EA2024 had higher levels of cellulose, uronic acids and p-coumarate than B73, upon drought these displayed increased levels of arabinose-enriched polymers, such as pectin-arabinans and arabinogalactan proteins, and a decreased lignin content. By contrast, a deeper rearrangement of cell walls including the modification of lignin composition and an increase of uronic acids was observed in B73. Drought induced higher changes in gene expression in B73 compared to EA2024, particularly in cell wall-related genes, that were altered in an inbred-specific manner. Transcription factor enrichment assays unveiled inbred-specific regulatory networks coordinating cell wall genes expression. Altogether, these findings reveal that B73 and EA2024 inbreds, with opposite stalk-lodging phenotypes, undertake different cell wall modification strategies in response to drought. We propose that the specific cell wall composition that confers lodging resistance to B73 compromises its cell wall plasticity and renders this inbred more susceptible to drought.
27 Sep 2023Submitted to Plant, Cell & Environment
27 Sep 2023Submission Checks Completed
27 Sep 2023Assigned to Editor
30 Sep 2023Review(s) Completed, Editorial Evaluation Pending
01 Oct 2023Reviewer(s) Assigned
29 Oct 2023Editorial Decision: Revise Minor