Abstract

Iris lutescens is a rhizomatous species of the Iridaceae family, generally found in the dry areas of the Mediterranean basin. It is characterised by large flowers, exhibiting a colour polymorphism in two varieties (yellow and purple). Even though it can grow on calcareous soils, it is reported as a serpentine-preferential taxon. In this work, the volatile emission in the headspaces of flowers, leaves and rhizomes of specimens of both the colour morphs growing on an ultramafic garigue have been analysed. The flower and rhizome headspaces had greater overall similarities compared to the leaves; flowers were the organs for which the volatile emission differed the most between the two colour morphs. Moreover, a comparison with a published headspace composition of I. lutescens yellow and purple flowers growing on calcareous soil evidenced quali-quantitative differences, as well as a greater differentiation of the volatile organic compounds emitted by the two colour morphs growing in a serpentine environment. To the best of our knowledge, this is the first report on the volatile emission of different organs of I. lutescens specimens growing on serpentine soil.

摘要

鸢尾（Iris lutescens）是鸢尾科的一种根茎种，通常见于地中海盆地的干旱地区。它的特征是大花，在两个品种（黄色和紫色）​​中表现出颜色多态性。尽管它可以在石灰质土壤上生长，但据报道是蛇纹岩优先分类群。在这项工作中，已经分析了在超镁铁质家谱上生长的两种颜色形态的标本的花朵，叶子和根茎顶部空间中的挥发性发射。与叶相比，花和根茎的顶空具有更大的整体相似性。花是两种颜色形态之间挥发物释放差异最大的器官。此外，与已发表的I. lutescens顶空成分进行比较在石灰质土壤上生长的黄色和紫色花朵表现出定性的定量差异，并且在蛇形环境中生长的两种颜色的形态所散发出的挥发性有机化合物的差异更大。据我们所知，这是关于蛇纹石土壤上生长的鸢尾标本不同器官挥发性排放的第一份报告。