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首页> 外文期刊>Biochemical Systematics and Ecology >Variations in leaf epicuticular n-alkanes in some Broussonetia, Ficus and Humulus species
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Variations in leaf epicuticular n-alkanes in some Broussonetia, Ficus and Humulus species

机译：布鲁氏菌属，榕属和Hum草属植物叶片表皮正构烷烃的变化

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摘要

n-Alkanes are biosynthesized from very long-chain fatty acid wax precursors and its distribution grants the most useful taxonomic contribution for plant species. In current study, five species from three genera of Moraceae family were sampled separately from three areas (Mountain Jin-yun, Mountain Jin-fo and Bei-bei) in Chongqing, China, namely, Broussonetia papyrifera, Broussonetia kazinoki, Ficus virens, Ficus tikoua, and Humulus scandens. The amounts of n-alkanes in epicuticular wax enabled discrimination among areas, varying from 4.9 mu g cm(-2) to 16.9 mu g cm(-2) in Mountain Jin-yun, 6.9 mu g cm(-2) to 20.5 mu g cm(-2) in Bei-bei, and 4.7 mu g cm(-2) to 61.7 mu g cm(-2) in Mountain Jin-fo, respectively. Among the five species, the amount of n-alkanes was the highest in B. papyrifera and the lowest in E tikoua for all areas, showing high species variation. The most abundant n-alkanes in all investigated species were two odd-numbered n-alkanes, i.e., C-29 and C-31. The epicuticular waxes of H. scandens from Bei-bei had a higher relative abundance of C-29 than other species from Mountain Jin-yun and Mountain Jin-fo. The chain length of n-alkanes from Bei-bei was longer than that from other areas. The even/odd predominance (EOP) or odd/even predominance (OEP) occurred in short-chain n-alkanes of plant epicuticular wax might be correlated with their growing environments. All Carbon Preference Index (CPIs) and Average Chain Length (ACLs) from Bei-bei were lower than those from other sampling areas, mainly attributing to the higher numbers of short- and mid-chain n-alkanes in plants from Bei-bei. Cluster analysis revealed that H. scandens from Bei-bei and E virens from Mountain Jin-yun were different from other species. Based on these findings, it seems that environmental conditions contribute to the complex patterns and variation of n-alkanes and different plant species had different responses to environment changes. The distribution of n-alkanes could be a good indicator to distinguish plant species under different growing conditions before other obvious morphological changes could be observed
机译：正构烷烃是由非常长链的脂肪酸蜡前体生物合成的，其分布为植物物种提供了最有用的分类学贡献。在当前的研究中，从中国重庆的三个地区（山金云，山金佛和北-），分别从桑科的三个属中提取了五个物种，即布鲁氏菌，棉铃虫，榕树，榕树。 tikoua和Hum草。表皮蜡中正构烷烃的数量能够区分区域，在金云山，从4.9μg cm（-2）到16.9 mu g cm（-2），从6.9μg cm（-2）到20.5 mu在北-分别为g cm（-2）和在Jin-fo山中为4.7μg cm（-2）至61.7μg cm（-2）。在这五个物种中，所有区域中正构烷烃的数量在所有产区均为最高，而在E tikoua中最低。在所有调查物种中，最丰富的正构烷烃是两个奇数正构烷烃，即C-29和C-31。北-树的表皮蜡相对于金云山和金佛山的其他物种具有较高的C-29相对丰度。北-正构烷烃的链长比其他地区长。植物表皮蜡的短链正构烷烃中出现的偶数/奇数优势（EOP）或奇数/偶数优势（OEP）可能与其生长环境有关。北-的所有碳偏好指数（CPI）和平均链长（ACL）均低于其他采样区域，主要归因于北plants植物中短链和中链正构烷烃的数量较高。聚类分析表明，北Bei的H. scandens和Jin云山的E virens与其他物种不同。基于这些发现，似乎环境条件导致了正构烷烃的复杂模式和变化，而且不同的植物物种对环境变化的反应也不同。在观察到其他明显形态变化之前，正构烷烃的分布可能是区分不同生长条件下植物物种的良好指标。

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