两种红苕(旋花科)的叶片解剖比较:分类学的重要性和对坎加斯干旱条件的适应性。

IF 2.3 3区 生物学 Q2 MULTIDISCIPLINARY SCIENCES
PeerJ Pub Date : 2024-12-10 eCollection Date: 2024-01-01 DOI:10.7717/peerj.18599
Joyce C R Silva, Kleber R Silva, Cecilio F Caldeira, Aline Oriani, Mauricio T C Watanabe
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引用次数: 0

摘要

背景:准确的物种鉴定是制定保护策略的第一步,尤其是对稀有和受威胁物种,如本文研究的物种。此外,了解特有物种对环境和生长条件的反应对其保护也很有必要。本研究比较了生长在巴西铁岩露头(cangas)上并表现出形态趋同的 Ipomoea cavalcantei 和 I. marabaensis 的叶片解剖特征:方法:描述了这两个物种的叶片解剖特征。此外,通过比较生长在自然坎加地区(原地)和表土栽培(异地)的个体,对 I. cavalcantei 的叶片适应潜力进行了评估。定量分析评估了气孔密度、气孔的极径和赤道径以及表皮和叶肉的厚度:结果:Cavalcantei 红苕和 Marabaensis 红苕可以通过叶肉类型区分。Ipomoea marabaensis 的特征还包括中脉背面存在侧突起。栽培的 I. cavalcantei 个体气孔密度较低,但其功能性(极径/赤道径)比自然环境中生长的个体更显著;这些个体的叶片角质层更薄,背面表皮细胞的壁更蜿蜒,毛状体和分泌细胞(鳞片状细胞)的出现率较低,中叶中含有更多含核果的特异细胞。所有这些特征都是对生长条件的适应,包括低光照和无水胁迫:结论:叶片的解剖学特征有助于划分处于非生殖期的 Ipomoea cavalcantei 和 I. marabaensis。在表土中栽培的 I. cavalcantei 的某些特征,尤其是表皮,对光照和水分供应有反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparative leaf anatomy of two species of Ipomoea L. (Convolvulaceae): taxonomic importance and adaptations to xeric conditions of the cangas.

Background: Accurate species identification is the first step towards establishing conservation strategies, especially regarding rare and threatened species, such as those studied here. Moreover, understanding the responses to the environment and growing conditions of endemic species is necessary for its conservation. This study compares the leaf anatomy of Ipomoea cavalcantei and I. marabaensis, which grow on the Brazilian ironstone outcrops (cangas) and exhibit morphological convergence.

Methods: Leaf anatomical characters of the species were described. Additionally, the leaf adaptive potential of I. cavalcantei was evaluated, comparing individuals grown in natural canga areas (in situ) and cultivated in topsoil (ex situ). Quantitative analysis evaluated stomatal density, polar and equatorial diameter of stomata, and thickness of the epidermis and mesophyll.

Results: Ipomoea cavalcantei and I. marabaensis can be distinguished by the mesophyll type. Ipomoea marabaensis is also characterized by the presence of lateral protuberances on the abaxial surface of the midrib. Individuals of I. cavalcantei under cultivation have lower stomatal density, although their functionality (polar/equatorial diameter) is more significant than those grown in a natural environment; these individuals also exhibit leaves with a thinner cuticle, abaxial epidermal cells with more sinuous walls, a lower occurrence of trichomes and secretory cells (laticifers), and more druse-containing idioblasts in the mesophyll. All these traits are adaptations to growing conditions that include lower light and the absence of water stress.

Conclusions: Leaf anatomical traits showed to be useful to delimit Ipomoea cavalcantei and I. marabaensis in the non-reproductive stage. For individuals of I. cavalcantei cultivated in topsoil, some features, especially of the epidermis, respond to light and water supply.

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来源期刊
PeerJ
PeerJ MULTIDISCIPLINARY SCIENCES-
CiteScore
4.70
自引率
3.70%
发文量
1665
审稿时长
10 weeks
期刊介绍: PeerJ is an open access peer-reviewed scientific journal covering research in the biological and medical sciences. At PeerJ, authors take out a lifetime publication plan (for as little as $99) which allows them to publish articles in the journal for free, forever. PeerJ has 5 Nobel Prize Winners on the Board; they have won several industry and media awards; and they are widely recognized as being one of the most interesting recent developments in academic publishing.
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