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• W4308185317 abstract "Rationale Cassava production will face challenges in a changing climate. Pulse labelling cassava with 13C-CO2 has the potential to elucidate carbon allocation mechanisms of cassava under drought stress and with potassium application. Understanding these mechanisms could guide efforts to mitigate effects of drought in cassava cropping systems. Methods Fourty-eight cassava plants received nutrient solution high or low in potassium. Water deficit was imposed on half of the plants at bulk root initiation stage, after which they were labelled for eight hours with 13C-CO2 in a 15 m3 growth chamber. Plants were harvested eight hours, nine days and 24 days after labelling, and separated into leaves, stems and roots. δ13C values of the different parts were measured with an isotope ratio mass spectrometer, from which 13C excess was calculated. Results Water deficit decreased transpiration (p < 0.001) and increased carbon respiration (p < 0.05). Potassium application increased assimilate distribution to the roots (p < 0.05) at nine days after labelling and this more strongly for plants under water deficit. The opposite was found at 24 days (p < 0.05) with the legacy of water deficit additionally increasing assimilate distribution to roots (p < 0.05). Youngest fully developed leaves contained up to 47% of initial 13C excess at 24 days after labelling. Conclusions The method of pulse labelling proved to be successful in shedding light on carbon allocation in relation to water and potassium availability. This technique, once adapted to field conditions, could further be used to improve fertilizer recommendations or change agronomic practices to cope with plant stress." @default.
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• W4308185317 date "2022-11-22" @default.
• W4308185317 modified "2023-10-17" @default.
• W4308185317 title "Carbon allocation in cassava is affected by water deficit and potassium application – A ¹³ C‐CO ₂ pulse labelling assessment" @default.
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• W4308185317 doi "https://doi.org/10.1002/rcm.9426" @default.
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