红毛丹果壳中齐墩果烷型三萜苷类成分的生防活性

Biocontrol Activity of Oleanane Saponins from the Rind of Nephelium lappaceum

研究了红毛丹果壳中的9个齐墩果烷型三萜苷类化合物对线虫(Panagrellus redivivus)、烟草青枯病菌(Ralstonia solanacearum)、棉花枯萎病菌(Fusarium oxysporum f.sp.vasinfectum)和香蕉枯萎病菌(Fusarium oxysporum f.sp.cubense)的生防活性,并分析了齐墩果烷型三萜苷拮抗病原菌的构效关系。研究结果表明,9个齐墩果烷型三萜苷对线虫(Panagrellus redivivus)均有一定的致死活性,部分化合物对烟草青枯病菌(Ralstonia solanacearum)、棉花枯萎病菌(Fusarium oxysporum f.sp.vasinfectum)和香蕉枯萎病菌(Fusarium oxysporum f.sp.cubense)显示拮抗作用,其中有4个齐墩果烷型三萜苷对这4种植物病原菌表现出兼抗活性。

Nine oleanane saponins were isolated from the rind of the rambutan（ Nephelium lappaceum） to determine their biocontrol activities against Panagrellus redivivus,Ralstonia solanacearum,Fusarium oxysporum f.sp. vasinfectum and Fusarium oxysporum f. sp. cubense,and the effect of the structures of these 9 compounds on the three pathogens was also analyzed. The 9 compounds were found to exhibit lethal activity against P. redivivus,and some compounds showed antagonism against R. solanacearum,F. oxysporum f. sp. vasinfectum and F.oxysporum f. sp. cubense. Four compounds displayed their antagonism against all the tested pathogens. The compound structure analysis showed that the compounds with the acetyl group linked to the sugar moiety were better in antagonistic action against the pathogens than those with no acetyl group linked to the sugar moiety,indicating the acetyl group in the structure of oleanane saponins is an important active group in biocontrol activity.