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    Author(s): Juan Du; Suzanne Gerttula; Zehua Li; Shu‐Tang Zhao; Ying‐Li Liu; Yu Liu; Meng‐Zhu Lu; Andrew T. Groover
    Date: 2020
    Source: New Phytologist
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Southwest Research Station
    PDF: Download Publication  (10.0 MB)

    Description

    Summary

    Brassinosteroids have been implicated in the differentiation of vascular cell types in herbaceous plants, but their roles during secondary growth and wood formation are not well defined. Here we pharmacologically and genetically manipulated brassinosteroid levels in poplar trees and assayed the effects on secondary growth and wood formation, and on gene expression within stems. Elevated brassinosteroid levels resulted in increases in secondary growth and tension wood formation, while inhibition of brassinosteroid synthesis resulted in decreased growth and secondary vascular differentiation. Analysis of gene expression showed that brassinosteroid action is positively associated with genes involved in cell differentiation and cell‐wall biosynthesis. The results presented here show that brassinosteroids play a foundational role in the regulation of secondary growth and wood formation, in part through the regulation of cell differentiation and secondary cell wall biosynthesis.

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    Citation

    Du, Juan; Gerttula, Suzanne; Li, Zehua; Zhao, Shu‐Tang; Liu, Ying‐Li; Liu, Yu; Lu, Meng‐Zhu; Groover, Andrew T. 2020. Brassinosteroid regulation of wood formation in poplar. New Phytologist. 225(4): 1516-1530. https://doi.org/10.1111/nph.15936.

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    Keywords

    brassinosteroids, forest tree, phytohormones, Populus, secondary growth, wood formation

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https://www.fs.usda.gov/treesearch/pubs/58565