期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 70, 期 22, 页码 6658-6669出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.2c01748
关键词
B; pilosa; hatching inhibitors; M; incognita; nematicidal activity; companion crop
资金
- German Academic Exchange Service (DAAD) [91672644]
- United States Department of Agriculture, Agricultural Research Service [58-6615-3-011 F]
- Norwegian Agency for Development Cooperation [RAF-3058 KEN-18/0005]
- Swedish International Development Cooperation Agency (Sida)
- Swiss Agency for Development and Cooperation (SDC)
- Kenyan Government
Plant parasitic nematodes can be suppressed by the non-host plant Bidens pilosa, which reduces the number of galls and egg masses in susceptible host plants. Chemical analysis identified vitamins and aromatic acids as the most active components in the root exudates of B. pilosa, exhibiting strong inhibition and nematicidal activity against Meloidogyne incognita.
Plant parasitic nematodes (PPNs) develop through three major stages in their life cycle: hatching, infection, and reproduction. Interruption of any of these stages can affect their growth and survival. We used screenhouse pot experiments, laboratory in vitro hatching and mortality assays, and chemical analysis to test the hypothesis that the non-host Asteraceae plant vegetable black-jack (Bidens pilosa) suppresses infection of the PPN Meloidogyne incognita in two susceptible Solanaceae host plants, tomato (Solanum lycopersicum) and black nightshade (S. nigrum). In intercrop and drip pot experiments, B. pilosa significantly reduced the number of galls and egg masses in root-knot nematode (RKN)-susceptible host plants by 3-9-fold compared to controls. Chemical analysis of the most bioactive fraction from the root exudates of B. pilosa identified several classes of compounds, including vitamins, a dicarboxylic acid, amino acids, aromatic acids, and a flavonoid. In in vitro assays, the vitamins and aromatic acids elicited the highest inhibition in egg hatching, whereas ascorbic acid (vitamin) and 2-hydroxybenzoic acid (aromatic acid) elicited strong nematicidal activity against M. incognita, with LC50/48 h values of 12 and 300 ng/mu L, respectively. Our results provide insights into how certain non-host plants can be used as companion crops to disrupt PPN infestation.
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