Naphthoquinones from Walnut Husk Residues Show Strong Nematicidal Activities against the Root-knot Nematode Meloidogyne hispanica

作者：Maleita Carla^*; Esteves Ivania; Chim Rita; Fonseca Luis; Braga Mara E M; Abrantes Isabel^*; de Sousa Herminio C^*

来源：ACS Sustainable Chemistry & Engineering, 2017, 5(4): 3390-3398.

DOI：10.1021/acssuschemeng.7b00039

• 1,4-Naphthoquinone
• Extracts
• Juglans spp
• Juglone
• Naphthoquinone-based bionematicides
• Plumbagin

Naphthoquinones exhibit important biological activities and are present in walnut husk residues in significant amounts. However, their potential as alternatives to synthetic nematicides has not been fully explored. This work aimed to assess the effects of pure naphthoquinones (juglone; 1,4-naphthoquinone; plumbagin) on the mortality of the root-knot nematode Meloidogyne hispanica second-stage juveniles J2). Extracts from Juglans spp. walnut husks were characterized, and the effects of J. nigra extracts on attraction and life cycle of M. hispanica were evaluated. 1,4-Naphthoquinone was the most effective compound causing 42% J2 mortality at SO ppm. The extract from in natura J. nigra walnut husks presented similar effects on J2 mortality to those observed for, pure 1,4-naphthoquinone. The extract from dried husks was repellent and reduced nematode root penetration but did not affect reproduction. Therefore, walnut residues can be valorized as renewable sources of naphthoquinone-based products and potentially employed as bionematicides against Meloidogyne spp.

• 出版日期2017-4