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    Auxin signaling and vascular cambium formation enables storage metabolism in cassava tuberous roots

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    Journal Article (2.212Mb)
    Date
    2021
    Author
    Rüscher, D.
    García, J.M.C.
    Carluccio, A.V.
    Klemens, P.A.
    Gisel, A.
    Stavolone, L.
    Neuhaus, H.E.
    Ludewig, F.
    Sonnewald, U.
    Zierer, W.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Cassava storage roots are among the most important root crops worldwide and represent one of the most consumed staple foods in Sub-Saharan Africa. The vegetatively propagated tropical shrub can form many starchy tuberous roots from its stem. These storage roots are formed through the activation of secondary root growth processes. However, the underlying genetic regulation of storage root development is largely unknown. Here we report on distinct structural and transcriptional changes occurring during the early phases of storage root development. A pronounced increase in auxin-related transcripts and the transcriptional activation of secondary growth factors, as well as a decrease in gibberellin-related transcripts was observed during the early stages of secondary root growth. This was accompanied by increased cell wall biosynthesis, increased most notably during the initial xylem expansion within the root vasculature. Starch storage metabolism was activated only after the formation of the vascular cambium. The formation of nonlignified xylem parenchyma cells and the activation of starch storage metabolism coincided with increased expression of the KNOX/BEL genes KNAT1, PENNYWISE and POUND-FOOLISH, indicating their importance for proper xylem parenchyma function.
    https://dx.doi.org/10.1093/jxb/erab106
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7099
    IITA Authors ORCID
    Anna Vittoria Carlucciohttps://orcid.org/0000-0001-6887-5792
    ANDREAS GISELhttps://orcid.org/0000-0001-7218-9488
    LIVIA STAVOLONEhttps://orcid.org/0000-0002-0691-1302
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1093/jxb/erab106
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Cassava; Handling, Transport, Storage and Protection of Agricultural Products; Plant Breeding; Plant Production
    Agrovoc Terms
    Cassava; Auxins; Development; Gibberellins; Parenchyma; Roots; Starch; Storage; Xylem
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Journal of Experimental Botany
    Collections
    • Journal and Journal Articles4836
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