Journal
MOLECULAR PLANT
Volume 13, Issue 4, Pages 658-665Publisher
CELL PRESS
DOI: 10.1016/j.molp.2019.12.010
Keywords
plant-parasitic nematode; chemotaxis; rhizosphere; organic diamine
Categories
Funding
- JSPS KAKENHI [25252032, 15H01230, 16H04168, 24114009, 24370024, 16K14757, 17H03967, 18H05487]
- INRA
- French Government (National Research Agency, ANR) through the Investments for the Future LABEX SIGNALIFE program [ANR-11-LABX-0028-01]
- Grants-in-Aid for Scientific Research [16H04168, 17H03967, 16K14757, 15H01230, 24114009] Funding Source: KAKEN
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Root-knot nematodes (RKNs; genus Meloidogyne) are a class of plant parasites that infect the roots of many plant species. It is believed that RKNs target certain signaling molecules derived from plants to locate their hosts; however, currently, no plant compound has been unambiguously identified as a universal RKN attractant. To address this question, we screened a chemical library of synthetic compounds for Meloidogyne incognita attractants. The breakdown product of aminopropylamino-anthraquinone, 1,3-diaminopropane, as well as its related compounds, putrescine and cadaverine, were found to attract M. incognita. After examining various polyamines, M. incognita were found to be attracted specifically by natural compounds that possess three to five methylene groups between two terminal amino groups. Using cryo-TOF-SIMS/SEM, cadaverine was indeed detected in soybean root cortex cells and the surrounding rhizosphere, establishing a chemical gradient. In addition to cadaverine, putrescine and 1,3-diaminopropane were also detected in root exudate by HPLC-MS/MS. Furthermore, exogenously applied cadaverine is sufficient to enhance M. incognita infection of Arabidopsis seedlings. These results suggest that M. incognita is likely attracted by polyamines to locate the appropriate host plants, and the naturally occurring polyamines have potential applications in agriculture in developing protection strategies for crops from RKN infection.
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