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    Metabolic profiles of six African cultivars of cassava (Manihot esculenta Crantz) highlight bottlenecks of root yield

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    Journal Article (2.267Mb)
    Date
    2020
    Author
    Obata, T.
    Klemens, P.A.W.
    Rosado-Souza, L.
    Schlereth, A.
    Gisel, A.
    Stavolone, L.
    Zierer, W.
    Morales, N.
    Muller, L.A.
    Zeeman, S.C.
    Ludewig, F.
    Stitt, M.
    Sonnewald, U.
    Neuhaus, H.E.
    Fernie, A.R.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
    Show full item record
    Abstract/Description
    Cassava is an important staple crop in sub‐Saharan Africa, due to its high productivity even on nutrient poor soils. The metabolic characteristics underlying this high productivity are poorly understood including the mode of photosynthesis, reasons for the high rate of photosynthesis, the extent of source/sink limitation, the impact of environment, and the extent of variation between cultivars. Six commercial African cassava cultivars were grown in a greenhouse in Erlangen, Germany, and in the field in Ibadan, Nigeria. Source leaves, sink leaves, stems and storage roots were harvested during storage root bulking and analyzed for sugars, organic acids, amino acids, phosphorylated intermediates, minerals, starch, protein, activities of enzymes in central metabolism and yield traits. High ratios of RuBisCO:phosphoenolpyruvate carboxylase activity support a C3 mode of photosynthesis. The high rate of photosynthesis is likely to be attributed to high activities of enzymes in the Calvin–Benson cycle and pathways for sucrose and starch synthesis. Nevertheless, source limitation is indicated because root yield traits correlated with metabolic traits in leaves rather than in the stem or storage roots. This situation was especially so in greenhouse‐grown plants, where irradiance will have been low. In the field, plants produced more storage roots. This was associated with higher AGPase activity and lower sucrose in the roots, indicating that feedforward loops enhanced sink capacity in the high light and low nitrogen environment in the field. Overall, these results indicated that carbon assimilation rate, the K battery, root starch synthesis, trehalose, and chlorogenic acid accumulation are potential target traits for genetic improvement.
    https://dx.doi.org/10.1111/tpj.14693
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/6849
    IITA Authors ORCID
    ANDREAS GISELhttps://orcid.org/0000-0001-7218-9488
    LIVIA STAVOLONEhttps://orcid.org/0000-0002-0691-1302
    Non-IITA Authors ORCID
    Lukas Mullerhttps://orcid.org/0000-0001-8640-1750
    Uwe Sonnewaldhttps://orcid.org/0000-0003-1835-5339
    Alisdair Ferniehttps://orcid.org/0000-0001-9000-335X
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1111/tpj.14693
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Agronomy; Cassava; Food Security; Food Systems; Plant Breeding; Plant Health; Plant Production; Value Chains
    Agrovoc Terms
    Cassava; Yields; Photosynthesis; Enzyme Activity; Nitrogen Metabolism; Starch; Chlorogenic Acid
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    The Plant Journal
    Collections
    • Journal and Journal Articles5286
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