Abstract

The study was aimed on a comparison of morphometric traits of the stomatal apparatus in cultivated Symphyotrichum Nees species to evaluate the adaptive capacity of these alien taxa. The study included eleven Symphyotrichum species from the collection of the Botanical Garden of Padua (Italy): S. novi-belgii, S. novae-angliae, S. ciliolatum, S. laeve, S. lateriflorum, S. puniceum, S. × salignum, S. × versicolor, S. chilense, S. cordifolium, and S. tradescantii. For these species, original data on 21 quantitative morphometric characteristics of the stomatal apparatus are presented. The species were divided into three groups according to the index of relative transpiration area (RTA). High RTA values (12–14%) were observed in S. novae-angliae, S. novi-belgii, and S. × salignum; medium RTA values (3–7%) were typical of S. lateriflorum, S. ciliolatum, S. laeve, S. × versicolor, and S. puniceum; finally, low RTA values (0.2–2.0%) were revealed in S. chilense, S. cordifolium, and S. tradescantii. As in the previous study of the genus Solidago, a positive correlation was observed between the RTA and the invasiveness of alien species. A hypothesis was proposed that a high RTA value indicates a greater adaptability of alien species and, along with other traits, can be used to predict the further expansion of their secondary range and possibility of their transformation into invasive species.

中文翻译：

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拟南芥属物种的气孔结构作为侵袭性的附加指标

摘要

该研究旨在比较栽培的Symphyotrichum Nees物种中气孔器具的形态特征，以评估这些外来类群的适应能力。这项研究包括11 Symphyotrichum从帕多瓦植物园（意大利）的集合种：S.诺维-belgii，S.新星- angliae，S. ciliolatum，S.柴，S. lateriflorum，S. puniceum，小号。×角质层，S。×云芝，S. chilense，S. cordifolium，和S. tradescantii。对于这些物种，提出了有关气孔器21种定量形态特征的原始数据。根据相对蒸腾面积（RTA）的指数将其分为三类。中观察到高RTA值（12-14％）S.新星-angliae，S.诺维-belgii，和小号。×角胶; 介质RTA值（3-7％）为典型的S. lateriflorum，S. ciliolatum，S.柴，S。×杂色和刺槐; 最后，低RTA值（0.2〜2.0％）被发现在S. chilense，S. cordifolium，和S. tradescantii。如先前对Solidago的研究，在RTA与外来物种的入侵之间观察到正相关。提出了一个假设，即较高的RTA值表明外来物种具有更大的适应性，并且可以与其他特征一起用于预测其次生范围的进一步扩大以及其转化为入侵物种的可能性。