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为明确挥发性化合物反式-2-己烯醛、香茅醛、1-辛烯-3-醇、芳樟醇、1-戊烯-3-醇对土传病害及线虫病的防治潜力,采用密封盘菌丝生长速率法比较了挥发性化合物对辣椒疫霉等7种植物土传病原真菌、南方根结线虫和禾谷孢囊线虫的生物活性。反式-2-己烯醛和香茅醛的生物活性高于1-辛烯-3-醇、芳樟醇及1-戊烯-3-醇,21.0μL/L反式-2-己烯醛处理能够完全抑制供试病原真菌菌丝的生长。10.5μL/L反式-2-己烯醛或香茅醛处理对花生冠腐病菌孢子及棉花黄萎病菌色素的产生均有较强的抑制作用,且42.0μL/L处理能够完全抑制黄瓜菌核病菌菌核的萌发。2.62μL/L反式-2-己烯醛处理南方根结线虫和禾谷孢囊线虫的2龄幼虫,24h的死亡率均为100%;2.62μL/L香茅醛处理24 h的死亡率分别为95.4%和89.5%,而对照处理的死亡率分别为2.5%和3.0%。研究表明反式-2-己烯醛及香茅醛具有较好的熏蒸抑菌及杀线虫活性。
In order to clarify the potential of controlling the soil-borne diseases and nematode diseases of trans-2-hexenal, citronellal, 1-octen-3-ol, linalool and 1-penten-3-ol, The bioactivities of volatile compounds against seven species of soil-borne pathogenic fungi, Meloidogyne incognita and Cereal cyst nematode, such as Phytophthora capsici, were compared using the sealed disc mycelium growth rate method. Trans-2-hexenal and citronellal have higher biological activity than 1-octen-3-ol, linalool and 1-penten-3-ol, 21.0 μL / The treatment can completely inhibit the growth of mycorrhizal fungi tested. Treatment with 10.5 μL / L trans-2-hexenal or citronellal had a strong inhibitory effect on the growth of D. pestis spores and P. verticillium wilt, and the treatment with 42.0 μL / L could completely inhibit the growth of cucumber Nuclear germ nuclear sclerotia. 2.62μL / L trans-2-hexenal treatment of root instar M. elegans and cereal cyst nematode second instar larvae, 24h mortality were 100%; 2.62μL / L citronellal treatment of 24 h mortality 95.4% and 89.5% respectively, while the control-treated mortality rates were 2.5% and 3.0% respectively. Studies have shown that trans-2-hexenal and citronellal have good fumigation antibacterial and nematicidal activity.