The cuticular wax layer can be important for plant resistance to insects. Thrips (Frankliniella occidentalis) damage was assessed on 11 pepper accessions of Capsicum annuum and C. chinense in leaf disc and whole plant assays. Thrips damage differed among the accessions. We analyzed the composition of leaf cuticular waxes of these accessions by GC-MS. The leaf wax composition was different between the two Capsicum species. In C. annuum, 1-octacosanol (C₂₈ alcohol) was the most abundant component, whereas in C. chinense 1-triacotanol (C₃₀ alcohol) was the prominent. Thrips susceptible accessions had significantly higher concentrations of C₂₅-C₂₉ n-alkanes and iso-alkanes compared to relatively resistant pepper accessions. The triterpenoids α- and ß-amyrin tended to be more abundant in resistant accessions. Our study suggests a role for very long chain wax alkanes in thrips susceptibility of pepper.

角质层蜡层对于植物抵抗昆虫很重要。在叶盘和整株植物测定中，对Capsicum annuum和C. chinense的 11 个辣椒种质进行了蓟马(Frankliniella occidentalis ) 损害评估。不同种质中蓟马的损害不同。我们通过 GC-MS 分析了这些材料的叶角质层蜡的组成。两种辣椒品种的叶蜡成分不同。在C. annuum 中，1-二十八烷醇（C ₂₈醇）是最丰富的成分，而在C. chinense 中，1-三十烷醇（C ₃₀醇）是最主要的。与相对抗性的辣椒种质相比，蓟马敏感种质具有明显更高浓度的C ₂₅ -C ₂₉正烷烃和异烷烃。抗性种质中的三萜类化合物 α- 和 ß-香树精往往更丰富。我们的研究表明，长链蜡烷烃在辣椒蓟马的易感性中发挥着作用。