Surface composition of myrmecophilic plants:: Cuticular wax and glandular trichomes on leaves of Macaranga tanarius
Surface composition of myrmecophilic plants:: Cuticular wax and glandular trichomes on leaves of Macaranga tanarius
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DOI：
10.1007/s10886-005-7104-1
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发表时间：
2005-10-01
影响因子：
2.3
通讯作者：
Jetter, R
中科院分区：
文献类型：
--
作者：
Guhling, O;Kinzler, C;Jetter, R
原生植物表面覆盖有由角质和蜡组成的角质层，是与昆虫相互作用的重要基质。对喜蚁植物血桐叶表面的组成进行了研究。异戊烯化的黄烷酮nymphaeol-C被确定在表面提取物和本地化完全在腺毛的背面叶侧。这些毛状体周围的表皮铺面细胞被一层光滑的上表皮蜡膜所覆盖，很少有小的蜡晶从中突出。上表皮的蜡质总量约为8 μ g cm（-2），相当于近轴和远轴叶侧蜡质负载量的85%。从两个叶片表面的表皮蜡混合物含有超过70%的伯醇，14%的脂肪酸，2%的醛，和痕量的乙酸烷基酯，与链长范围从C-20到C-38。相比之下，表皮内蜡层主要由三萜醇α-香树脂醇、β-香树脂醇和羽扇豆醇主导。因此，这些特征化合物不能用于与植物表面上的昆虫直接接触。
Primary plant surfaces, covered with cuticles consisting of cutin and waxes, are important substrates for interaction with insects. The composition of leaf surfaces of the myrmecophilic plant Macaranga tanarius was studied. The prenylated flavanone nymphaeol-C was identified in surface extracts and was localized exclusively in glandular trichomes on the abaxial leaf side. The epidermal pavement cells surrounding these trichomes were covered with a smooth film of epicuticular wax from which few small wax crystals protruded. The epicuticular wax amounted to approximately 8 mu g cm(-2), corresponding to 85% of the wax load on the adaxial as well as the abaxial leaf sides. The epicuticular wax mixtures from both leaf surfaces contained more than 70% primary alcohols, 14% fatty acids, 2% aldehydes, and traces of alkyl acetates, with chain lengths ranging from C-20 to C-38. In contrast, the intracuticular wax layer was largely dominated by triterpenoid alcohols alpha-amyrin, beta-amyrin, and lupeol. Consequently, these characteristic compounds are not available for direct contact with insects on the plant surface.