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首页> 外文期刊>Biochemical Systematics and Ecology >Geographic and genetic variation in the leaf surface resin components of Mimulus aurantiacus from southern California
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Geographic and genetic variation in the leaf surface resin components of Mimulus aurantiacus from southern California

机译：南加州的ur草叶片表面树脂成分的地理和遗传变异

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摘要

Nearly 30% of the dry weight of leaves of the chaparral subshrub Mimulus aurantiacus comprise leaf surface resins. This resin provides some defense against the insect herbivore. Euphydryas chalcedona and may also protect plants from desiccation and UV light injury. The resin is composed of several components and the different components may contribute differentially to the resin's multiple protective roles. The quantities of each of seven resin components from field-grown plants, from six southern California populations of M. aurantiacus spanning a range of water availability and differing in attack by E. chalcedona, and clones from these plants grown in a common garden, were determined. Two predictions were tested: (1) E. chalcedona will attack plant populations with relatively low quantities of total resins and/or concentrations of the ortho dihydroxy resins, and (2) plant populations in drier environments will produce resin that is relatively richer in the methoxylated components than plant populations in more mesic environments. Although resin composition differed genetically among plant populations, the pattern of variation was not as predicted. Insect attack was not associated with lower levels of ortho dihydroxy compounds, and populations with higher proportions of methoxylated flavonoids were not found in the drier sites. The pattern of genetic variation among populations in resin composition therefore was not explained by the differences in chemical structure that were predicted to influence the role of the components as herbivore protectants or antidesiccants.
机译：丛林亚灌木Mimulus aurantiacus的叶片干重的近30％包含叶片表面树脂。这种树脂为昆虫的食草动物提供了一定的防御能力。 Euphydryas chalcedona，也可以保护植物免受干燥和紫外线的伤害。树脂由几种组分组成，不同的组分可能对树脂的多重保护作用做出不同的贡献。来自加利福尼亚南部南部六个地区的M. aurantiacus田间生长植物的七种树脂成分的量各不相同，这些范围跨越了水的供应范围，并且受到大肠杆菌的攻击程度不同，并且这些植物的克隆生长在一个共同的花园中。决心。测试了两个预测：（1）芥菜油菜将以相对较低的总树脂量和/或邻二羟基树脂浓度攻击植物种群，（2）在干燥环境中的植物种群将产生相对较丰富的树脂。在更多的环境中，甲氧基化的组分比植物种群多。尽管植物种群之间的树脂组成在遗传上有所不同，但变异模式并未如预期的那样。昆虫攻击与较低水平的邻二羟基化合物无关，在较干燥的地方未发现甲氧基化类黄酮含量较高的种群。因此，无法通过预测会影响这些成分作为草食动物保护剂或抗干燥剂作用的化学结构差异来解释树脂组合物中种群间遗传变异的模式。

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