Effects of Sweet Potato on the Chemotaxis of Ditylenchus destructor

doi:10.16409/j.cnki.2095-039x.2018.01.017

Abstract

Abstract: The potato rot nematode, Ditylenchus destructor Thorne could cause severe damage to sweet potato. Phytochemicals of host plant play important roles in nematode behavior. In order to obtain extracts with high attraction activity to D. destructor, the chemotaxis of D. destructor to different sweet potato cultivars were investigated on water agar plates. The results showed that the storage roots of susceptible cultivars Lizixiang were significantly more attractive than the other cultivars. Sweetpotato was consistently attractive to the nematodes in all these assays. Nematodes around the sweet potato increased with the resident time, and the chemotaxis index reached 20% after 96 h. Compared with the stem sap, leaves and storage roots, stems showed the strongest attraction ability to nematodes. No significant differences in relative attractiveness were detected between the fresh sweet potato stems and the stems that heated at 80℃ for 8 h, indicating that the attractant from sweetpotato was stable to heat. Furthermore, the compounds of sweet potato were extracted and determined in relation to the host-finding behavior of the nematode. The chemotaxis index of the fraction extracted with alcohol was 6.7%, which were significantly more attractive than the other fractions.

Key words: Ditylenchus destructor, sweet potato, attraction activity, extractions

CLC Number:

S435.31

MA Juan, WANG Rongyan, LI Xiuhua, GAO Bo, WEN Haiyue, CHEN Shulong. Effects of Sweet Potato on the Chemotaxis of Ditylenchus destructor[J]. journal1, 2018, 34(1): 141-147.

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