A lignin-derived material improves plant nutrient bioavailability and growth through its metal chelating capacity

Qiang Liu, Tsubasa Kawai, Yoshiaki Inukai, Dan Aoki, Zhihang Feng, Yihui Xiao, Kazuhiko Fukushima, Xianyong Lin, Weiming Shi, Wolfgang Busch, Yasuyuki Matsushita () and Baohai Li ()
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Qiang Liu: Zhejiang University
Tsubasa Kawai: Nagoya University
Yoshiaki Inukai: Nagoya University
Dan Aoki: Nagoya University
Zhihang Feng: Zhejiang University
Yihui Xiao: Zhejiang University
Kazuhiko Fukushima: Nagoya University
Xianyong Lin: Zhejiang University
Weiming Shi: Foshan University
Wolfgang Busch: Salk Institute for Biological Studies
Yasuyuki Matsushita: Nagoya University
Baohai Li: Zhejiang University

Nature Communications, 2023, vol. 14, issue 1, 1-15

Abstract: Abstract The lignocellulosic biorefinery industry can be an important contributor to achieving global carbon net zero goals. However, low valorization of the waste lignin severely limits the sustainability of biorefineries. Using a hydrothermal reaction, we have converted sulfuric acid lignin (SAL) into a water-soluble hydrothermal SAL (HSAL). Here, we show the improvement of HSAL on plant nutrient bioavailability and growth through its metal chelating capacity. We characterize HSAL’s high ratio of phenolic hydroxyl groups to methoxy groups and its capacity to chelate metal ions. Application of HSAL significantly promotes root length and plant growth of both monocot and dicot plant species due to improving nutrient bioavailability. The HSAL-mediated increase in iron bioavailability is comparable to the well-known metal chelator ethylenediaminetetraacetic acid. Therefore, HSAL promises to be a sustainable nutrient chelator to provide an attractive avenue for sustainable utilization of the waste lignin from the biorefinery industry.

Date: 2023
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DOI: 10.1038/s41467-023-40497-2

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