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<p>Cassava (<i>Manihot esculenta</i>) is an important crop for food security in the tropics, particularly for smallholder farmers in sub-Saharan Africa, where yields are often severely limited by pathogen pressure, nutrient deficiency and water scarcity. We expressed a non-rectifying <i>Arabidopsis thaliana</i> potassium (K<sup>+</sup>) channel gene version, <i>AKT2</i><sub><i>var</i></sub>, in the vascular tissue of cassava plants. The transgenic cassava plants had higher electron transport and CO<sub>2</sub> assimilation rates, a higher bulk flow velocity and increased source–sink carbohydrate transport, as demonstrated by comparative <sup>11</sup>C-positron emission tomography and tissue-specific metabolite profiling. Cassava storage root yield was significantly increased in greenhouse experiments and in a multi-year field trial conducted under subtropical conditions. <i>AKT2</i><sub><i>var</i></sub> plants were also more tolerant of drought stress and had higher storage root yield. Targeted alteration of K<sup>+</sup> transport is therefore a promising strategy to improve cassava productivity without additional fertilizer input and in climate-adverse growing conditions.</p>

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Engineering vascular potassium transport increases yield and drought resilience of cassava

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月17日

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  • W. Zierer,
  • M. Fritzler,
  • T. J. Chiu,
  • R. B. Anjanappa,
  • S.-H. Chang,
  • R. Metzner,
  • J. Quiros,
  • C. E. Lamm,
  • M. Thieme,
  • R. Koller,
  • G. Huber,
  • O. Muller,
  • U. Rascher,
  • U. Sonnewald,
  • H. E. Neuhaus,
  • W. Gruissem,
  • L. Bellin

摘要

Cassava (Manihot esculenta) is an important crop for food security in the tropics, particularly for smallholder farmers in sub-Saharan Africa, where yields are often severely limited by pathogen pressure, nutrient deficiency and water scarcity. We expressed a non-rectifying Arabidopsis thaliana potassium (K+) channel gene version, AKT2var, in the vascular tissue of cassava plants. The transgenic cassava plants had higher electron transport and CO2 assimilation rates, a higher bulk flow velocity and increased source–sink carbohydrate transport, as demonstrated by comparative 11C-positron emission tomography and tissue-specific metabolite profiling. Cassava storage root yield was significantly increased in greenhouse experiments and in a multi-year field trial conducted under subtropical conditions. AKT2var plants were also more tolerant of drought stress and had higher storage root yield. Targeted alteration of K+ transport is therefore a promising strategy to improve cassava productivity without additional fertilizer input and in climate-adverse growing conditions.