1.College of Plant Protection/Agricultural Foundation Experiment Teaching Center,Yunnan Agricultural University,Kunming 650201,China
2.Key Laboratory of Agriculture Biodiversity for Plant Disease Management,the Ministry of Education,Yunnan Agricultural University,Kunming 650201,China
3.Plant Protection and Quarantine Station of Tonghai County,Yuxi 652700,China
The aims of this study were to investigate the control mechanism of sweet corn rotation combined with marigold straw returning mode on cabbage clubroot disease, and provide theoretical basis and technical support for the planting mode. Fluorescence quantitative PCR technology, non-target metabolomics technology, high-throughput sequencing technology and field test verification were used in this study to explore the field control effect of sweet corn rotation combined with marigold straw returning treatment (CrMs) on Chinese cabbage clubroot, the number of resting spores and the differences in metabolites and microbial species in rhizosphere soil of Chinese cabbage. The results showed that: The field control effect of CrMs treatment on cabbage clubroot was 61.11%. The number of resting spores in the soil decreased from 1×105.92 spores per gram to 1×103.73 spores per gram. CrMs treatment changed the metabolite components in the rhizosphere soil of Chinese cabbage, increased the contents of metabolites such as chenodeoxycholic acid, alpha-Linolenic acid and 4-Isopropylbenzoic acid, and decreased the contents of metabolites such as oleamide and melibiose. Alpha-Linolenic acid and chenodeoxycholic acid were negatively correlated with the relative abundance of Plasmodiophora, and oleamide was positively correlated with the relative abundance of Plasmodiophora. In addition, CrMs treatment enriched the rhizosphere microbial diversity of Chinese cabbage, improved the composition of the soil microbial community, significantly increased the relative abundance of Bacillus, Bradyrhizobium, Lysobacter and Streptomyces, and decreased the relative abundance of Plasmodiophora, Fusarium,and Helicotylenchus. In summary, the new mode of sweet corn rotation+marigold straw returning to the field is an important cultivation measure to control the Chinese cabbage clubroot, which provides a key technical reference for the green prevention and control of the clubroot.
将采集的土样从4 ℃冰箱中取出,使用土壤DNA提取试剂盒Power Soil DNA Isolation Kit (MO BIO Laboratories,Inc,USA) 提取土壤DNA,以PB05F:5'-GAACGGGTTCACAGACTAGAT-3',PB05R:5'-GCCCACTGTGTTAATGATCC-3'为扩增引物,参照李淼等[31]方法,对甜玉米种植前、甜玉米轮作配施万寿菊秸秆返田处理后和对照土样中根肿菌休眠孢子的数量进行检测。
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