Burr marigold (Bidens tripartita L.) roots directly and immediately scavenge rhizosphere methane with highly exuded hydrogen peroxide via a rhizosphere ?Fenton reaction

• Published in: Plant and soil 2021-02, Vol.459 (1/2), p.289-313
• Main Authors: Wagatsuma, Tadao, Tanaka, Kazuhiro, Iino, Yuuichirou, Satou, Tsuyoshi, Khan, Md. Shahadat Hossain, Tawaraya, Keitaro
• Format: Article
• Language: English
• Subjects: Analysis; Aquatic plants; Bidens tripartita; Biomedical and Life Sciences; Chemical reactions; Cultivated plants; Ecology; Emissions; Exudation; Flooded soils; Flowers & plants; Hydrogen peroxide; Iron; Life Sciences; Measurement; Metal ions; Methane; Methods; Plant Physiology; Plant roots; Plant Sciences; Plant species; Regular Article; REGULAR ARTICLES; Rhizosphere; Roots; Roots (Botany); Scavenging; Soil conditions; Soil Science & Conservation; Soils; Species; Transition metals
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/s11104-020-04766-z

Aims The major factors controlling the soil methane (CH 4 ) concentration and CH 4 emissions of various plant (mainly wetland) species were identified. Methods Five plant species ( Oryza sativa , Zizania latifolia , Phragmites australis , Sesbania cannabina , and Bidens tripartita ) were separately cultivated under the flooded soil conditions. The direct CH 4 scavenging potential of B. tripartita roots was also measured in conjunction with in vitro CH 4 scavenging experiments using H 2 O 2 and several transition metal ions. Results CH 4 emissions from the soil-cultivated plants did not depend on the maximum CH 4 emission potential for each plant species but on the soil CH 4 concentrations, which were positively correlated with the CH 4 production potential of the soil and negatively correlated with soil Eh values. Bidens tripartita roots possessed the highest increasing soil Eh potential and a direct, immediate, and continuous CH 4 scavenging potential via the Fenton reaction using a considerably high concentration of root apoplastic H 2 O 2 and rhizosphere Fe 2+ . Conclusions Bidens tripartita presented the highest soil Eh ascending potential. The in vitro experiments suggested the involvement of・OH/Fe IV O 2+ via the newly termed rhizosphere Fenton reaction as a strong destructive power for CH 4 . To our knowledge, this is the first report on direct CH 4 scavenging by high H 2 O 2 -exuding plant roots.