CN113040151B - 生物碱streptindole及其衍生物在防治植物病毒病菌病中的应用 - Google Patents

生物碱streptindole及其衍生物在防治植物病毒病菌病中的应用 Download PDF

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CN113040151B
CN113040151B CN201911373104.6A CN201911373104A CN113040151B CN 113040151 B CN113040151 B CN 113040151B CN 201911373104 A CN201911373104 A CN 201911373104A CN 113040151 B CN113040151 B CN 113040151B
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王兹稳
高咏悦
张铭君
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Abstract

本发明涉及一种生物碱streptindole及其衍生物在治疗植物病毒病菌病中的应用,本发明首次发现streptindole及其衍生物I‑1~I‑14表现出很好的抗植物病毒病菌活性,能很好地抑制烟草花叶病毒(TMV)和黄瓜枯萎,花生褐斑,苹果轮纹,小麦纹枯,玉米小斑,西瓜炭疽,水稻恶苗,番茄早疫,小麦赤霉,水稻稻瘟,辣椒疫霉,油菜菌核,黄瓜灰霉,水稻纹枯14种植物病菌。

Description

生物碱streptindole及其衍生物在防治植物病毒病菌病中的 应用
技术领域
本发明涉及一种生物碱streptindole及其衍生物在防治植物病毒和病菌病中的应用,属于农业防护技术领域。
背景技术
植物病毒病又称为“植物癌症”,在农业生产中是仅次于真菌危害的一类严重的病害。常见的植物病毒病有大约1000多种,多由716种病毒造成。由于植物病毒是一种活体的寄生物,在其入侵了寄主细胞以后,病毒核酸会与寄主的核糖体结合,在寄主代谢过程中复制病毒蛋白。因此,想要找到一种不对寄主造成损害而又能够有效抑制病毒危害的药物,现阶段仍是十分困难的(中国科学:化学,2016,46(11):1204-1209;中国烟草科学,2011,32(1):84-91.)。八十年代初,植物病毒病给美国农业造成的损失每年达15-20亿美元;直至现在,我国每年由于病毒感染农作物造成的损失有近200亿美元,植物病毒病引起的损失是世界人口生存的威胁之一(江苏农业科学,2017,(24):25-31;Science,2012,336(6082):740-743)。烟草上危害最为严重的病毒即是烟草花叶病毒(Tobacco Mosaic Virus,TMV)。TMV是目前世界上研究最为深入的模式病毒,属于披盖病毒科(Togaviridae)烟草花叶病毒属(Tobamovirus)的单链RNA (ssRNA)病毒(Annu.Rev.Phytopathol.,2004,42(1):13-34)。TMV可浸染38个科268种植物,该病毒病阻碍了烟草产量和品质的进一步提高,对烟草生产危害极大,一般年份发病率约为 25%,严重的达50%以上,经济损失惨重。
目前,不仅有效的植物病毒抑制剂还不多,而且治疗性药剂更少,所报道的药剂在田间实际应用时其防效大多在60%以下。当前使用的代表性农药登记品种有:氨基寡糖素(由D- 氨基葡萄糖以β-1.4糖苷键连接的低聚糖天然产物)、宁南霉素、病毒唑、病毒A(盐酸吗啉胍·乙酸铜)等。
生物源天然农药主要是指以植物、动物、微生物等产生的具有农用生物活性的次生代谢产物开发的农药,如2.5%鱼藤酮乳油,15%井岗霉素水溶粉剂,等。次生代谢物质是Czapek 在20世纪20年代首先提出来的。所谓次生代谢物质,其来源和性质与基础代谢产物如核酸蛋白质等有所不同,是复杂的分支代谢途径的最后产物,大多数不直接参与维持产生者的生长发育和生殖有关的原始生化过程。基于天然产物的新农药发现已逐渐成为创新农药的主要途径。筛选出具有抗植物病毒活性的天然源活性物质作为先导,对其化学结构进行衍生改造,以获得高活性抗植物病毒药物的方法,具有环境兼容性好的优点,符合未来农药发展的趋势,有较好的开发和应用前景。
Streptindole(结构式一)是一种具有双吲哚结构的天然生物碱,属于双吲哚甲烷天然产物中的一种。1983年,Osawa等首次从人类肠道菌Streptococcus faecium IB 37分离到streptindole(Tetrahedron Lett.1983,24,4719)。目前还没有关于该类化合物抗植物病毒病菌活性的报道。
发明内容
本发明提供一种生物碱streptindole及其衍生物I(结构式一)在防治植物病毒病菌病中的应用。本专利的一种生物碱streptindole及其衍生物I具有很好的抗植物病毒和病菌活性。
本发明的一种生物碱streptindole及其衍生物如通式I所示,具体为I-1~I-14。
Figure BSA0000198237430000021
本发明的生物碱streptindole衍生物I-1~I-3按照反应式一所示的方法制备,两当量的相应的吲哚1与一当量的醛2在0.2当量的碘催化下缩合得到化合物I-1~I-3。
Figure BSA0000198237430000022
本发明的生物碱streptindole衍生物I-4按照反应式二所示的方法制备,酯I-1在乙醇中与水合肼发生肼解反应得到化合物I-4。
Figure BSA0000198237430000031
本发明的I-5和I-6按照反应式三所示的方法制备,酯I-1在四氢呋喃中经四氢铝锂还原得I-5,再与乙酰氯反应得到化合物I-6。
Figure BSA0000198237430000032
本发明的I-7按照反应式四所示的方法制备,醛3在乙酸中与硝基甲烷缩合得硝基烯4,再在NBS催化下与吲哚1a加成得到化合物I-7。
Figure BSA0000198237430000033
本发明的I-8~I-12按照反应式五所示的方法制备,醛5在乙腈中碘催化下与吲哚1a缩合得I-8,再在甲苯溶液中经水合肼去保护得化合物I-9,再与相应的酰氯反应得化合物I-8~I-12。
Figure BSA0000198237430000041
本发明的I-13和I-14按照反应式六所示的方法制备,衍生物I-9在二氯甲烷中与相应的异硫氰酸酯反应得化合物I-13和I-14。
Figure BSA0000198237430000042
相比于现有技术,本发明首次发现生物碱streptindole及其衍生物I-1~I-14表现出很好的抗植物病毒和病菌活性,能很好地抑制烟草花叶病毒(TMV)和黄瓜枯萎,花生褐斑,苹果轮纹,小麦纹枯,玉米小斑,西瓜炭疽,水稻恶苗,番茄早疫,小麦赤霉,水稻稻瘟,辣椒疫霉,油菜菌核,黄瓜灰霉,水稻纹枯14种植物病菌。
具体实施方式
实施例1:化合物I-1~I-3的合成:0℃,搅拌状态下,向溶有相应吲哚1(5mmol)和醛2(0.26 g,2.5mmol)的乙腈溶液(25mL)中加入I2(0.13g,0.5mmol)。保持在该温度下搅拌30min,加入5%Na2S2O3溶液(20mL)淬灭反应。反应液用乙酸乙酯萃取(3×50mL),有机相用饱和食盐水洗涤(100mL),无水Na2SO4干燥,抽滤,浓缩。剩余物以石油醚和乙酸乙酯(5∶1,v/v)柱层析得化合物I-1~I-3。
2,2-双(1H-吲哚-3-基)乙酸乙酯(I-1).棕色油状物;收率91%;1H NMR(400MHz,CDCl3)δ8.03 (s,2H,NH),7.67(d,J=7.9Hz,2H,Ar-H),7.30(t,J=8.1Hz,2H,Ar-H),7.23-7.21(m,2H, Ar-H),7.14-7.10(m,2H,Ar-H),7.00(d,J=2.0Hz,2H,Ar-H),5.53(s,1H,Ar2-CH),4.25(q,J= 7.1Hz,2H,CH2),1.29(t,J=7.1Hz,3H,CH3);13C NMR(100MHz,CDCl3)δ173.7,136.3, 126.7,123.5,122.1,119.5,119.3,113.5,111.3,61.2,40.7,14.3.
2,2-双(5-溴-1H-吲哚-3-基)乙酸乙酯(I-2).棕色油状物;收率85%;1H NMR(400MHz,CDCl3) δ8.28(s,2H,NH),7.75(d,J=1.7Hz,2H,Ar-H),7.27(d,J=1.8Hz,1H,Ar-H),7.25(d,J=1.8 Hz,1H,Ar-H),7.17(s,1H,Ar-H),7.15(s,1H,Ar-H),7.00(d,J=2.3Hz,2H,Ar-H),5.37(s,1H, Ar2-CH),4.26(q,J=7.1Hz,2H,CH2),1.31(t,J=7.1Hz,3H,CH3);13CNMR(100MHz,CDCl3) δ173.5,135.1,128.1,125.1,124.7,121.8,113.0,112.9,112.6,61.7,40.6,14.2.
2,2-双(6-溴-1H-吲哚-3-基)乙酸乙酯(I-3).棕色油状物;收率85%;1H NMR(400MHz,CDCl3) δ8.27(s,2H,NH),7.46(s,2H,Ar-H),7.44(s,1H,Ar-H),7.20(d,J=1.4Hz,1H,Ar-H),7.17(d,J =1.3Hz,1H,Ar-H),6.98-7.07(m,3H,Ar-H),5.42(s,1H,Ar2-CH),4.24(q,J=7.1Hz,2H,CH2), 1.28(t,J=7.1Hz,3H,CH3);13C NMR(100MHz,CDCl3)δ173.4,137.1,125.4,124.0,122.9,120.5,115.7,114.3,113.4,61.5,40.5,14.3.
实施例2:2,2-双(1H-吲哚-3-基)乙酰肼(I-4)的合成:搅拌状态下,向溶有酯I-1(1.59g,5mmol) 的乙醇溶液(25mL)中加入80%的水合肼(25mL)。回流反应3h,冷至室温,浓缩掉部分乙醇,析出大量固体,抽滤,水洗,干燥得白色固体化合物I-4(1.26g,83%),熔点234-235℃;1H NMR(400MHz,DMSO-d6):δ10.87(s,2H,NH),9.42(s,1H,NH2-NH),7.57(d,J=7.9Hz, 2H,Ar-H),7.34(d,J=8.1Hz,2H,Ar-H),7.17(d,J=2.2Hz,2H,Ar-H),7.07-7.03(m,2H,Ar-H), 6.96-6.92(m,2H,Ar-H),5.26(s,1H,Ar2-CH),4.26(s,2H,NH-NH2);13C NMR(100MHz, DMSO-d6)δ172.3,136.6,127.1,124.1,121.3,119.4,118.6,114.3,111.8,39.5.
实施例3:化合物2,2-双(1H-吲哚-3-基)乙醇(I-5)和2,2-双(1H-吲哚-3-基)乙基乙酸酯(I-6)的合成:
第一步:0℃,搅拌状态下,向四氢呋喃(50mL)中缓慢加入四氢铝锂(0.57g,15mmol),搅拌10min,慢慢加入酯I-1(1.59g,5mmol),反应液自然升至室温,反应3h,缓慢向反应体系中滴加水(10mL)淬灭反应。加硅藻土抽滤,滤饼用乙酸乙酯洗涤,合并有机相用无水 Na2SO4干燥,抽滤,浓缩,柱层析得浅黄色油状化合物I-5(1.02g,74%);1H NMR(400MHz,CDCl3)δ7.95(s,2H,NH),7.60(d,J=7.9Hz,2H,Ar-H),7.17-7.20(m,4H,Ar-H),7.09(t,J=6.2Hz,2H,Ar-H),6.72(s,2H,Ar-H),4.72(t,J=5.9Hz,1H,Ar2-CH),4.20(d,J=5.8Hz,2H,CH2),2.32(s,1H,OH);13C NMR(100MHz,CDCl3)δ136.5,126.9,122.9,122.0,119.4,119.3,115.9,111.5,85.7,36.9.C18H17N2O[M+H]+277.1335,found(ESI+)277.1331.
第二步:0℃,搅拌状态下,向化合物I-5(1.38g,5mmol)和三乙胺(0.76g,7.5mmol)的二氯甲烷(30mL)溶液中,缓慢加入乙酰氯(0.43g,5.5mmol),反应液自然升至室温,反应3h,缓慢向反应体系中滴加水(40mL)淬灭反应,分液,水相二氯甲烷萃取(30mL×2),合并有机相用无水Na2SO4干燥,抽滤,浓缩,柱层析得棕色油状化合物I-6(0.92g,58%);1H NMR(400MHz,CDCl3)δ7.92(s,2H,NH),7.60(d,J=7.9Hz,2H,Ar-H),7.28(d,J=8.1Hz,2H, Ar-H),7.15(t,J=7.5Hz,2H,Ar-H),7.05(t,J=7.6Hz,2H,Ar-H),6.86(d,J=2.1Hz,2H,Ar-H), 4.92(t,J=7.1Hz,1H,Ar2-CH),4.71(d,J=7.1Hz,2H,CH2),1.95(s,3H,CH3);13C NMR(100 MHz,CDCl3)δ171.5,136.5,127.0,122.2,122.1,119.5,119.4,116.2,111.2,67.5,33.6,21.2. C20H19N2O2[M+H]+319.1441,found(ESI+)319.1447.
实施例4:3,3′-(2-硝基乙烷-1,1-二取代)双(1H-吲哚)(I-7)的合成:
第一步:100mL圆底烧瓶分别加入吲哚甲醛(1.0g,6.9mmol),乙酸铵(0.53g,6.9mmol),冰乙酸(5.3mL),硝基甲烷(1.3g,21.3mmol),反应液120℃下反应4h。减压除去大部分乙酸,加入乙酸乙酯100mL,水100mL,分液,水相再用乙酸乙酯洗涤(50mL×2),合并有机相,饱和食盐水洗涤,无水Na2SO4干燥,抽滤,浓缩,柱层析得棕红色固体化合物4(1.09g,84%),熔点170-172℃;1H NMR(400MHz,CDCl3)δ8.82(s,1H,NH),8.29(d,J=13.5Hz,1H,NO2CH),7.80(d,J=13.5Hz,1H,Ar-CH),7.76-7.80(m,1H,Ar-H),7.67(d,J=2.9Hz,1H,Ar-H),7.47-7.49(m,1H,Ar-H),7.32-7.37(m,2H,Ar-H).
第二步:搅拌状态下,向化合物4(1.0g,5.32mmol)的二氯甲烷(100mL)溶液中依次加入吲哚 (0.62g,5.32mmol)和NBS(0.95g,5.32mmol),反应液回流反应16h,冷至室温,加入水100 mL,分液,水相再用二氯甲烷洗涤(50mL×2),合并有机相,饱和食盐水洗涤,无水Na2SO4干燥,抽滤,浓缩,柱层析得棕色固体化合物I-7(0.73g,45%),熔点63-65℃;1H NMR(400 MHz,CDCl3)δ8.06(s,2H,NH),7.62(d,J=7.9Hz,2H,Ar-H),7.38(d,J=8.1Hz,2H,Ar-H), 7.23(t,J=7.8Hz,2H,Ar-H),7.13(t,J=7.8Hz,2H,Ar-H),7.05(t,J=2.3Hz,2H,Ar-H),5.53(t, J=7.8Hz,1H,Ar-CH),5.11(d,J=7.8Hz,2H,NO2-CH2).
实施例5:化合物I-8~I-12的合成:
第一步:0℃,搅拌状态下,向溶有吲哚1a(0.59g,5mmol)和醛5(0.48g,2.5mmol)的乙腈溶液(25mL)中加入I2(0.13g,0.5mmol)。保持在该温度下搅拌30min,加入5%Na2S2O3溶液(20 mL)淬灭反应。反应液用乙酸乙酯萃取(3×50mL),有机相用饱和食盐水洗涤(100mL),无水 Na2SO4干燥,抽滤,浓缩。剩余物以石油醚和乙酸乙酯(2∶1,v/v)柱层析得粉色固体化合物 2-(2,2-双(1H-吲哚-3-基)乙基)异吲哚啉-1,3-二酮(I-8)(0.97g,96%)。熔点210-211℃;1H NMR (400MHz,CDCl3)δ7.97(s,2H,NH),7.75(d,J=8.0Hz,2H,Ar-H),7.72(dd,J=3.2,5.5Hz,2H, Ar-H),7.61(dd,J=3.0,5.4Hz,2H,Ar-H),7.29(d,J=8.0Hz,2H,Ar-H),7.13(t,J=7.2Hz,2H, Ar-H),7.09(d,J=2.0Hz,2H,Ar-H),7.03(t,J=7.5Hz,2H,Ar-H),5.31(t,J=7.7Hz,1H, Ar2-CH),4.37(d,J=7.8Hz,2H,CH2).C26H20N3O2[M+H]+406.1550,found(ESI+)406.1556.
第二步:搅拌状态下,向溶有化合物I-8(1g,2.5mmol)的甲苯溶液(50mL)中加入80%的水合肼(0.78g,12.5mmol)。反应液加热回流20h,冷至室温。减压浓缩出去甲苯,然后加入二氯甲烷200mL,2mol/L的氢氧化钠水溶液100mL,萃取分液,水相再用100mL二氯甲烷萃取,合并有机相,100mL水洗,干燥,减压脱除溶剂得白色固体化合物2,2-双(1H-吲哚-3-基) 乙基-1-胺(I-9)(0.63g,91%)。熔点164-165℃;1H NMR(400MHz,DMSO-d6)δ10.80(s,2H, NH),7.50(d,J=7.9Hz,2H,Ar-H),7.30(d,J=8.1Hz,2H,Ar-H),7.21(s,2H,Ar-H),7.00(t,J=7.6Hz,2H,Ar-H),6.87(t,J=7.6Hz,2H,Ar-H),4.38(t,J=7.1Hz,1H,Ar2-CH),3.26(d, J=7.0Hz,2H,CH2),1.33(s,2H,NH2).C18H18N3[M+H]+276.1495,found(ESI+)276.1491.
第三步:0℃,搅拌状态下,向化合物I-9(1g,3.64mmol)和三乙胺(0.76g,7.5mmol)的二氯甲烷(80mL)溶液中,缓慢加入相应的酰氯(4mmol),反应液自然升至室温,反应3h,缓慢向反应体系中滴加水(40mL)淬灭反应,分液,水相二氯甲烷萃取(30mL×2),合并有机相用无水Na2SO4干燥,抽滤,浓缩,柱层析得化合物I-10~I-12;
N-(2,2-双(1H-吲哚-3-基)乙基)苯甲酰胺(I-10).棕色固体;收率80%;熔点74-75℃;1H NMR (400MHz,CDCl3)δ8.41(s,1H,Ar-H),8.30(d,J=7.8Hz,1H,Ar-H),7.84(d,J=7.9Hz,1H, Ar-H),7.78(d,J=8.0Hz,2H,Ar-H),7.69-7.63(m,2H,Ar-H,NH),7.57-7.51(m,4H,Ar-H),7.47 (s,1H,Ar-H),7.39(t,J=7.3Hz,2H,Ar-H),7.27-7.24(m,3H,Ar-H),6.54(t,J=4.5Hz,1H, CH2-NH),5.07(t,J=6.9Hz,1H,Ar2-CH),4.45(t,J=6.3Hz,2H,CH2);13CNMR(100MHz, CDCl3)δ167.8,136.7,133.7,131.4,130.2,128.5,126.9,126.8,122.3,122.2,119.6,119.5,116.7, 111.3,44.2,34.3.C25H22N3O[M+H]+380.1757,found(ESI+)380.1751.
N-(2,2-双(1H-吲哚-3-基)乙基)乙酰胺(I-11).棕色固体;收率82%;熔点69-70℃;1H NMR (400MHz,CDCl3)δ8.21-8.15(m,2H,Ar-H),7.58(d,J=8.0Hz,2H,Ar-H),7.33(d,J=8.1Hz, 2H,Ar-H),7.16(t,J=7.1Hz,2H,Ar-H),7.04-6.95(m,4H,Ar-H,NH),5.59(s,1H,CH2-NH), 4.71(t,J=6.8Hz,1H,Ar2-CH),4.01(t,J=6.4Hz,2H,CH2),1.85(s,3H,CH3);13C NMR(100 MHz,CDCl3)δ170.3,136.6,126.9,122.1,119.5,119.4,116.9,111.3,45.4,34.3,23.4.C20H20N3O [M+H]+318.1601,found(ESI+)318.1607.
N-(2,2-双(1H-吲哚-3-基)乙基)-4-甲基苯磺酰胺(I-12).棕色固体;收率90%;熔点108-109℃;1H NMR(400MHz,CDCl3)δ8.03(s,2H,NH),7.61(d,J=8.3Hz,2H,Ar-H),7.41-7.34(m,4H, Ar-H),7.23-7.18(m,5H,Ar-H,CH2-NH),7.05-7.01(m,2H,Ar-H),6.92(d,J=2.1Hz,2H,Ar-H), 4.66(t,J=6.7Hz,1H,Ar2-CH),3.69(d,J=6.7Hz,2H,CH2),2.43(s,3H,CH3);13C NMR(100 MHz,CDCl3)δ143.4,136.53,136.45,129.7,127.1,126.4,122.8,122.2,119.5,119.2,115.6,111.4, 46.6,34.2,21.6.C25H24N3O2S[M+H]+430.1584,found(ESI+)430.1588.
实施例6:化合物I-13和I-14的合成:0℃,搅拌状态下,向化合物I-9(1g,3.64mmol)的二氯甲烷(50mL)溶液中,缓慢加入相应的异硫氰酸酯(3.64mmol),反应液自然升至室温,反应3h,缓慢向反应体系中滴加水(40mL)淬灭反应,分液,水相二氯甲烷萃取(30mL×2),合并有机相依次用饱和碳酸氢钠溶液(40mL),饱和食盐水溶液(40mL)洗涤,无水Na2SO4干燥,抽滤,浓缩,柱层析得化合物I-13和I-14;
1-(2,2-双(1H-吲哚-3-基)乙基)-3-(4-甲氧基苯基)硫脲(I-13).浅黄色固体;收率66%;熔点 265-266℃;1H NMR(400MHz,CDCl3)δ8.01(s,2H,NH),7.65(d,J=8.0Hz,2H,Ar-H),7.39 (d,J=8.2Hz,2H,Ar-H),7.20-7.23(m,3H,Ar-H),7.06-7.10(m,2H,Ar-H),7.01(d,J=2.1Hz, 2H,Ar-H),6.86(t,J=8.8Hz,1H,CH2-NH),6.58(dd,J=8.9Hz,4H,Ar-H),5.95(s,1H, CH2NHCS-NH),4.97(t,J=7.3Hz,1H,Ar2-CH),4.42(q,J=5.8Hz,2H,CH2),3.75(s,3H,CH3);13C NMR(100MHz,DMSO-d6)δ179.5,136.4,126.7,125.2,122.6,120.9,118.9,118.1,116.01, 115.97,113.8,111.4,55.1.C26H25N4OS[M+H]+441.1744,found(ESI+)441.1741.
1-苄基-3-(2,2-双(1H-吲哚-3-基)乙基)硫脲(I-14).深棕色固体;收率69%;熔点93-94℃;1H NMR(400MHz,CDCl3)δ8.00(s,2H,NH),7.56(d,J=7.8Hz,2H,Ar-H),7.29-7.43(m,5H, Ar-H),7.16-7.21(m,4H,Ar-H),7.02-7.06(m,2H,Ar-H),6.75(d,J=2.0Hz,2H,Ar-H),6.02(s, 1H,CH2NHCS-NH),5.75(s,1H,CH2NH),4.76(t,J=6.7Hz,1H,Ar2-CH),4.73(s,2H,Ph-CH2), 4.13-4.18(m,2H,Ar2CH-CH2);13C NMR(100MHz,CDCl3)δ180.6,135.5,133.2,127.9,127.7,127.6,127.4,126.7,126.4,125.8,121.3,121.2,118.5,110.3,47.6,32.7,28.7.C26H25N4S[M+H]+ 425.1794,found(ESI+)425.1799.
实施例7:抗烟草花叶病毒活性的测定,测定程序如下:
1、病毒提纯及浓度测定:
病毒提纯及浓度测定参照南开大学元素所生测室编制烟草花叶病毒SOP规范执行。病毒粗提液经2次聚乙二醇离心处理后,测定浓度,4℃冷藏备用。
2、化合物溶液配制:
称量后,原药加入DMF溶解,制得1×105μg/mL母液,后用含1‰吐温80水溶液稀释至所需浓度;宁南霉素制剂直接兑水稀释。
3、活体保护作用:
选长势均匀一致的3-5叶期珊西烟,全株喷雾施药,每处理3次重复,并设1‰吐温80 水溶液对照。24h后,叶面撒布金刚砂(600目),用毛笔蘸取病毒液,在全叶面沿支脉方向轻擦2次,叶片下方用手掌支撑,病毒浓度10μg/mL,接种后用流水冲洗。3d后记录病斑数,计算防效。
4、活体治疗作用:
选长势均匀一致的3-5叶期珊西烟,用毛笔全叶接种病毒,病毒浓度为10μg/mL,接种后用流水冲洗。叶面收干后,全株喷雾施药,每处理3次重复,并设1‰吐温80水溶液对照。3d后记录病斑数,计算防效。
5、活体钝化作用:
选长势均匀一致的3-5叶期珊西烟,将药剂与等体积的病毒汁液混合钝化30min后,摩擦接种,病毒浓度10μg/mL,接种后即用流水冲洗,重复3次,设1‰吐温80水溶液对照。3d后数病斑数,计算结果。
抑制率(%)=[(对照枯斑数-处理枯斑数)/对照枯斑数]×100%
首先在处理剂量500μg/mL条件下进行所有化合物的抗烟草花叶病毒活体钝化活性测试,相对抑制率大于40%的化合物进一步进行处理剂量500μg/mL条件下的活体治疗和活性保护活性测试。阳性对照为商品化抗植物病毒药剂病毒唑。
表1生物碱streptindole及其衍生物I-1~I-14的抗烟草花叶病毒(TMV)活性测试结果
Figure BSA0000198237430000091
从表1数据可见,生物碱streptindole及其衍生物I-1~I-14均表现出不错的抗TMV活性,化合物I-5,I-6,I-9,I-14的活性明显优于病毒唑,具有极大的开发价值。
实施例8:抗菌活性测试,测定程序如下:
离体杀菌测试,菌体生长速率测定法(平皿法):
将一定量药剂溶解在适量丙酮内,然后用含有200μg/mL乳化剂水溶液稀释至所需浓度,然后各吸取1mL药液注入培养皿内,再分别加入9mL培养基,摇匀后制成50μg/mL的含药平板,以添加1mL灭菌水的平板做空白对照。用直径4mm的打孔器沿菌丝外缘切取菌盘,移至含药平板上。每处理重复三次。将培养皿放在24±1℃恒温培养箱内培养。48小时后调查各处理菌盘扩展直径,求平均值,与空白对照比较计算相对抑菌率。
Figure BSA0000198237430000092
表2生物碱streptindole及其衍生物I-1~I-14的离体杀菌活性测试结果:
Figure BSA0000198237430000101
生物碱streptindole及其衍生物在测试浓度为50μg/mL的条件下对14种被测试菌都表现出广谱的抑制活性。多种化合物对多种菌株表现出优于对照样百菌清的活性,具备极大的开发价值。
上述实施例中所涉及的原料和试剂均由商购或参考文献方法制备获得,化学反应工艺是本技术领域的技术人员所能掌握的。

Claims (1)

1.生物碱streptindole及其衍生物在防治烟草花叶病毒病中的应用,所述生物碱streptindole及其衍生物为下述I-1~I-14结构式中的一种:
Figure FSB0000196269420000011
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