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98382

Anatomical Studies for Adaptational Aspects in The Stem of <i> Cynanchum forskaolianum </i> (Schult.) Meve & Liede

Article

Last updated: 01 Jan 2025

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Abstract

DRY habitats of southwestern Saudi Arabia are home to many stem-succulents, of which Cynanchum forskaolianum inhabit a wide range in these harsh environments. In this study, some anatomical and ultrastructure features of stem in C. forskaolianum were examined by using light microscopy, scanning electron microscopy and transmission electron microscopy to investigate adaptational aspects that enable this plant to cope with its stressful habitats. The stem of the plant has multiple morpho-anatomical adaptations of which low surface/volume ratio is an indication of voluminous capacity to store water. Thin boundary layer results in reduced heat-storage capacity. Papillose shape of epidermal cells together with thick epicuticular wax with thin cuticle reduces water loss. Sunken stomata with deep encryption as well as low stomatal frequency decrease transpiration and enhance water use efficiency. The large substomatal cavities with intercellular spaces in chlorenchyma promote gas exchange and diffusion of CO2. Ultrastructure of chlorenchymatous cells showed that chloroplasts have many plastoglobuli and low stacking of thylakoids, which corresponds to high light stress and leads to chloroplast protection against photoinhibition. Cortex cells have highly undulated walls that lend flexibility during drought. Ultrastructure of these walls revealed light packed fibrillar material, which can play a major role in such flexibility, enabling cells to easily lose and refill with water to support activity of adjacent chlorenchyma cells. Xylem characteristics increase safety of water transport with less vulnerability to cavitation. These anatomical and ultrastructure features of stem show C. forskaolianum as a highly adaptable species in its dry habitats.

DOI

10.21608/ejbo.2020.24457.1455

Keywords

adaptation, <i> Cynanchum forskaolianum </i>, Dry habitats, stem anatomy, Ultrastructure

Authors

First Name

Yahya

Last Name

Masrahi

MiddleName

-

Affiliation

Biology Department, Faculty of Science, Jazan University, Jazan, Saudi Arabia

Email

ymasrahi@gmail.com

City

Jazan

Orcid

-

Volume

60

Article Issue

3

Related Issue

19388

Issue Date

2020-12-01

Receive Date

2020-02-22

Publish Date

2020-12-01

Page Start

763

Page End

772

Print ISSN

0375-9237

Online ISSN

2357-0350

Link

https://ejbo.journals.ekb.eg/article_98382.html

Detail API

https://ejbo.journals.ekb.eg/service?article_code=98382

Order

33

Type

Original Article

Type Code

111

Publication Type

Journal

Publication Title

Egyptian Journal of Botany

Publication Link

https://ejbo.journals.ekb.eg/

MainTitle

Anatomical Studies for Adaptational Aspects in The Stem of <i> Cynanchum forskaolianum </i> (Schult.) Meve & Liede

Details

Type

Article

Created At

22 Jan 2023