香草硫缩病醚对稻瘟病菌的抑制活性及在水稻上的应用

Inhibitory activity of Vanisulfane against Pyricularia oryzae and its application on rice

为明确高效低毒低残留植物生长调节剂香草硫缩病醚在水稻上的应用,使用室内毒力测定和田间药效试验,初步探明该小分子药剂在水稻上的使用技术。结果表明,5%香草硫缩病醚原药(XCLSBM)及2.5%香草硫缩病醚2.5%寡糖复配剂原药(XCLSBMO)对稻瘟病菌(Pyricularia oryzae)生长有抑制作用,25μg·mL^(-1)XCLSBM和25μg·mL^(-1)XCLSBMO对稻瘟病菌生长抑制率分别为48.1%和82.2%;2.5μg·mL^(-1)XCLSBM、25μg·mL^(-1)XCLSBM、2.5μg·mL^(-1)XCLSBO和25μg·mL^(-1)XCLSBO对稻瘟病菌分生孢子产生、孢子萌发和附着胞形成均有显著影响;12%香草硫缩病醚·寡糖微乳剂(XCLSBMOME)50g·ha-1在田间对稻瘟病防效可达到85.92%±0.20%,水稻增产6%~6.3%。表明生产中可利用香草硫缩病醚防治水稻稻瘟病并促进水稻增产增收。

To clarify the application of small molecule agents on rice,the technology of using highly effective,low toxicity and low residue plant growth regulator Vanisulfane on rice is initially explored using indoor toxicity measurements and field efficacy tests.The results show that 5%Vanisulfane(XCLSBM)and 2.5%Vanisulfane 2.5%oligosaccharide compound prodrug(XCLSBMO)inhibited the growth of Pyricularia oryzae with 25μg·mL^(-1) XCLSBM and 25μg·mL^(-1) XCLSBMO inhibiting the growth of Pyricularia oryzae by 48.1%and 82.2%,respectively.The inhibition rates of 2.5μg·mL^(-1)XCLSBM,25μg·mL^(-1)XCLSBM,2.5μg·mL^(-1)XCLSBO and 25μg·mL^(-1) XCLSBO has significant effects on conidia production,spore germination and appressorium formation of rice fungus.The effectiveness of 50 g·ha-112%XCLSBMO in the field against rice blast can reach 85.92%±0.20%,and the yield increase of rice after treatment with 12%XCLSBMO ranged from 6%to 6.3%.This indicates that XCLSBM can be used in production to control rice blast and promote rice yield increase.