NOTES ON LEAF AND STEM ANATOMY OF Thlaspi sensu lato

Cengiz Karai̇smai̇loğlu,Osman Erol

doi:10.23902/trkjnat.762509

Cengiz Karai̇smai̇loğlu, Osman Erol

Open Access

https://doi.org/10.23902/trkjnat.762509

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Abstract

In this study, anatomical characteristics of leaves and stems of 19 taxa of Thlaspi sensu lato, 9 of which are endemic to Turkey, were investigated in order to determine taxonomic relationships among the studied taxa. The anatomical characteristics of all taxa were determined and assessed using the cluster analysis and the principal component analysis. The transverse sections of the leaves and stems exhibited various diagnostic characters in terms of the pattern of epidermal cell and mesophyll layers, the number and size of vascular bundles, and the thickness of the cortex and endodermis. Important differences were detected in number, size, and index of stomata, and in epidermal cell wall structures in the adaxial and abaxial surfaces. The results showed that the compared anatomical characteristics among taxa are partially compatible with their sectional delimitation in their traditional rank in The Flora of Turkey and the East Aegean Islands. The results also point out that some taxonomic re-arrangements may be required.

Highlights

Brassicaceae is a large and important plant family in terms of economically significant species and model organisms such as Arabidopsis Heynh. and Brassica L
The results showed that the compared anatomical characteristics among taxa are partially compatible with cengiz.karaismailoglu@siirt.edu.tr their sectional delimitation in their traditional rank in The Flora of Turkey and the East Aegean
This paper offers the first comprehensive assessment of the systematic importance of leaf and stem anatomy in the examined Thlaspi taxa

Summary

Introduction

Brassicaceae is a large and important plant family in terms of economically significant species and model organisms such as Arabidopsis Heynh. and Brassica L. Brassicaceae is a large and important plant family in terms of economically significant species and model organisms such as Arabidopsis Heynh. The family has approximately 338 genera and 3709 species worldwide, primarily in temperate zones of the Northern Hemisphere (Al-Shehbaz et al 2006). In Turkey, Brassicaceae includes 571 species with 65 subspecies, 24 varieties and 660 taxa belonging to 91 genera (Al-Shehbaz et al 2007). Thlaspi L. is known to be one of the largest genera of Brassicaceae and it has 75 species distributed mainly in Eurasia (Al-Shehbaz 1986, Appel & Al-Shehbaz 2003). The genus, represented by 36 taxa at various levels, is diverse in Turkey. Twenty-one of these taxa are endemic to Turkey, making the endemism rate of the genus 58% (Davis 1988, Karaismailoğlu & Erol 2019)

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