Parasitism and pathogenicity of Radopholus similis to Ipomoea aquatica, Basella rubra and Cucurbita moschata and genetic diversity of different populations

LI Yu; WANG Ke; XIE Hui; XU Chun-ling; WANG Dong-wei; LI Jing; HUANG Xin

首页> 中文期刊> 《农业科学学报（英文版）》 >Parasitism and pathogenicity of Radopholus similis to Ipomoea aquatica, Basella rubra and Cucurbita moschata and genetic diversity of different populations

Parasitism and pathogenicity of Radopholus similis to Ipomoea aquatica, Basella rubra and Cucurbita moschata and genetic diversity of different populations

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Ten populations of Radopholus similis from different ornamental hosts were tested for their parasitism and pathogenicity to water spinach(Ipomoea aquatic), malabar spinach(Basella rubra), and squash(Cucurbita moschata) in pots. The results showed all three plants were new hosts of R. similis. Growth parameters of plants inoculated with nematodes were significantly lower than those of healthy control plants. All R. similis populations were pathogenic to the three plants, but pathogenicity differed among populations from different hosts. The same R. similis populations also showed different pathogenic effects in the three different plants. Rad N5 population from Anthurium andraeanum had the highest pathogenicity to the three studied plants. Rad N1 from A. andraeanum had the lowest pathogenicity to squash and Rad N7 from Chrysalidocarpus lutesens had the lowest pathogenicity to water spinach and malabar spinach. R. similis is usually associated with root tissues, but here we report that it could be found to move and feed in the stem bases of all three studied plants. Sequence and phylogenetic analyses of DNA markers of the 18 S r RNA, 28 S r RNA, ITS r RNA, and mitochondrial DNA gene sequences of ten R. similis populations revealed significant genetic diversity. Rad N5 and Rad N6 populations from anthurium showed a close genetic relationship and could be distinguished from other populations by PCR-RFLP. At the same time, Rad N5 and Rad N6 populations were the most pathogenic to three studied plants. These results confirm the e xistence of large biological variability and molecular diversity among R. similis populations from the same or different hosts, and these characteristics are related to pathogenic variability.

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《农业科学学报（英文版）》 |2016年第1期|120-134|共15页
作者
LI Yu; WANG Ke; XIE Hui; XU Chun-ling; WANG Dong-wei; LI Jing; HUANG Xin;
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Laboratory of Plant Nematology and Research Center of Nematodes of Plant Quarantine, Department of Plant Pathology, South China Agricultural University, Guangzhou 510642, P.R.China;

Laboratory of Plant Nematology and Research Center of Nematodes of Plant Quarantine, Department of Plant Pathology, South China Agricultural University, Guangzhou 510642, P.R.China;

Laboratory of Plant Nematology and Research Center of Nematodes of Plant Quarantine, Department of Plant Pathology, South China Agricultural University, Guangzhou 510642, P.R.China;

Laboratory of Plant Nematology and Research Center of Nematodes of Plant Quarantine, Department of Plant Pathology, South China Agricultural University, Guangzhou 510642, P.R.China;

Laboratory of Plant Nematology and Research Center of Nematodes of Plant Quarantine, Department of Plant Pathology, South China Agricultural University, Guangzhou 510642, P.R.China;

Laboratory of Plant Nematology and Research Center of Nematodes of Plant Quarantine, Department of Plant Pathology, South China Agricultural University, Guangzhou 510642, P.R.China;

Laboratory of Plant Nematology and Research Center of Nematodes of Plant Quarantine, Department of Plant Pathology, South China Agricultural University, Guangzhou 510642, P.R.China;

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Parasitism and pathogenicity of Radopholus similis to Ipomoea aquatica, Basella rubra and Cucurbita moschata and genetic diversity of different populations

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