Comparative pollen morphology of the genera Axyris L., Ceratocarpus L., Grayia Hook. & Arn. and Krascheninnikovia Gueldenst. (Amaranthaceae)

IF 1.7 3区地球科学 Q2 PALEONTOLOGY

Review of Palaeobotany and Palynology Pub Date : 2026-02-01 Epub Date: 2025-11-26 DOI:10.1016/j.revpalbo.2025.105477

Zoya M. Tsymbalyuk , Daniella Ivanova , Lyudmila M. Nitsenko

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引用次数: 0

Abstract

Based on morphological, morphometric and molecular data, Axyris, Ceratocarpus and Krascheninnikovia, were classified to the subtribe Axyridinae, and later this group was elevated to tribe Axyrideae (Chenopodiaceae / Amaranthaceae). Previously, the representatives of these three genera, together with Grayia, have been included in the subtribe Eurotiinae. Their relationships are poorly understood; the position of Grayia still remains unclear. Considering that palynomorphological traits can be useful for angiosperm taxonomy, the aim of this research was to provide detailed data on the Axyrideae and Grayia pollen characters and to evaluate their taxonomic significance. Pollen morphology of 13 specimens belonging to seven species of the genera Axyris, Ceratocarpus, Grayia (including Zuckia), and Krascheninnikovia was studied using light and scanning electron microscopy. Pollen grains are pantoporate, spheroidal, mainly circular in outline, small or medium-sized. Exine sculpture and pore membranes are nanoechinate, tectum is psilate-perforate. The data obtained showed that species and genera can be identified based on palynomorphological features, especially the pollen diameter, pore number, pore diameter, distance between pores and between pore centres, nanoechini density, number of nanoechini on pore membranes, exine thickness, and structure of columellae. Exine structure (columellae) of pollen grains of all species was analysed for the first time in the present study. UPGMA dendrogram, based on quantitative pollen traits (nanoechini height, width at the base, number per 4 μm², and number on pore membrane), supported the differentiation of genera. The data obtained confirm the close relationships between tribe Axyrideae (Axyris, Ceratocarpus, Krascheninnikovia) and Grayia (including Zuckia). This study highlights the importance of palynomorphological characters for the taxonomy.

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鸢尾属、角鼻花属、凤尾花属花粉形态比较。和攻击。和Krascheninnikovia Gueldenst。(苋科)

根据形态学、形态测量学和分子测量学资料，将Axyris、Ceratocarpus和Krascheninnikovia划分为Axyridinae亚族，后将其提升为axyridae族（Chenopodiaceae / amaranaceae）。在此之前，这三个属的代表，连同格雷亚，被包括在欧洲亚族。人们对它们之间的关系知之甚少；格雷娅的位置仍不明朗。考虑到花粉形态特征对被子植物的分类有重要意义，本研究的目的是为被子植物的花粉特征提供详细的资料，并评价其分类意义。本文采用光镜和扫描电镜技术研究了石竹属（Axyris）、Ceratocarpus、Grayia（包括Zuckia）和Krascheninnikovia 7种13个标本的花粉形态。花粉粒为宽孔状，球形，轮廓以圆形为主，小或中等。外叶雕刻和孔膜呈纳米针状，顶盖呈具囊孔状。根据孢粉形态特征，特别是花粉直径、孔数、孔直径、孔间和孔中心之间的距离、纳米针孔密度、孔膜上纳米针孔数、外壁厚度和小柱结构，可以进行种属鉴定。本研究首次对所有树种花粉粒的外叶结构（小柱）进行了分析。UPGMA树状图显示花粉的数量特征（纳米针尖高度、基部宽度、每4 μm2数量和孔膜数量）支持属的分化。所获得的资料证实了axyridae部落（Axyris, Ceratocarpus, Krascheninnikovia）和Grayia（包括Zuckia）之间的密切关系。本研究强调了形态学特征对植物分类学的重要性。

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来源期刊

Review of Palaeobotany and Palynology 地学-古生物学

CiteScore

3.50

自引率

21.10%

发文量

149

审稿时长

6 months

期刊介绍： The Review of Palaeobotany and Palynology is an international journal for articles in all fields of palaeobotany and palynology dealing with all groups, ranging from marine palynomorphs to higher land plants. Original contributions and comprehensive review papers should appeal to an international audience. Typical topics include but are not restricted to systematics, evolution, palaeobiology, palaeoecology, biostratigraphy, biochronology, palaeoclimatology, paleogeography, taphonomy, palaeoenvironmental reconstructions, vegetation history, and practical applications of palaeobotany and palynology, e.g. in coal and petroleum geology and archaeology. The journal especially encourages the publication of articles in which palaeobotany and palynology are applied for solving fundamental geological and biological problems as well as innovative and interdisciplinary approaches.