Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan

Studies on cambial variants of Taiwanese species from the genus Clematis (Ranunculaceae) are scarce. This study aimed to investigate and compare the patterns of secondary growth in stems of 22 Clematis taxa, including 19 species and three varieties. The experimental results showed that approximately...

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Autores principales:	Sheng-Zehn Yang, Po-Hao Chen, Chien-Fan Chen
Formato:	article
Lenguaje:	EN
Publicado:	National Taiwan University 2021
Materias:	ranunculaceae ray indentation ring bark scale bark vessel restriction wedge phloem Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/c7df7f9c3dcf495ebc8521d8bfbfe643
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spelling	oai:doaj.org-article:c7df7f9c3dcf495ebc8521d8bfbfe6432021-11-26T02:00:26ZStem cambial variants of the Clematis species (Ranunculaceae) in Taiwan10.6165/tai.2021.66.5260372-333Xhttps://doaj.org/article/c7df7f9c3dcf495ebc8521d8bfbfe6432021-11-01T00:00:00Zhttps://taiwania.ntu.edu.tw/abstract.php?type=abstract&id=1790https://doaj.org/toc/0372-333XStudies on cambial variants of Taiwanese species from the genus Clematis (Ranunculaceae) are scarce. This study aimed to investigate and compare the patterns of secondary growth in stems of 22 Clematis taxa, including 19 species and three varieties. The experimental results showed that approximately 27% of the Clematis species in Taiwan had 12 vascular bundles in the stem. In three cambial variants of the genus, the stem was characterized by an irregular conformation, axial vascular elements in segments, and a wedge-like phloem. The rhytidome is composed of periderm and non-conducting phloem and forms either cogwheel-like or continuous segment bark. Eight Clematis species formed arc-like bark, which developed the cogwheel-like rhytidome. Most Clematis species had an indentation in the region of the wider rays, and the wedge-like indentations developed in the interfascicular region of C. henryi var. morii and C. pseudootophora. Narrow rays that occurred in the secondary xylem increased with increasing stem diameter. The vessels dispersed throughout the stem were semi-ring-porous in most species but ring-porous in others. No species had diffuse porous vessels. The vessel restriction pattern was only found in the two species, C. psilandra and C. tsugetorum. The primary xylem ring was located around the pith of C. uncinata var. uncinata, making its pith cavity hexagonal in shape. Five species had the pith cavity feature. This study provides important basic information about Clematis lianas and addresses their taxonomy, which will help to understand their morphology and to ensure the conservation of their diversity.Sheng-Zehn YangPo-Hao ChenChien-Fan ChenNational Taiwan Universityarticleranunculaceaeray indentationring barkscale barkvessel restrictionwedge phloemBiology (General)QH301-705.5ENTaiwania, Vol 66, Iss 4, Pp 526-540 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ranunculaceae ray indentation ring bark scale bark vessel restriction wedge phloem Biology (General) QH301-705.5
spellingShingle	ranunculaceae ray indentation ring bark scale bark vessel restriction wedge phloem Biology (General) QH301-705.5 Sheng-Zehn Yang Po-Hao Chen Chien-Fan Chen Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan
description	Studies on cambial variants of Taiwanese species from the genus Clematis (Ranunculaceae) are scarce. This study aimed to investigate and compare the patterns of secondary growth in stems of 22 Clematis taxa, including 19 species and three varieties. The experimental results showed that approximately 27% of the Clematis species in Taiwan had 12 vascular bundles in the stem. In three cambial variants of the genus, the stem was characterized by an irregular conformation, axial vascular elements in segments, and a wedge-like phloem. The rhytidome is composed of periderm and non-conducting phloem and forms either cogwheel-like or continuous segment bark. Eight Clematis species formed arc-like bark, which developed the cogwheel-like rhytidome. Most Clematis species had an indentation in the region of the wider rays, and the wedge-like indentations developed in the interfascicular region of C. henryi var. morii and C. pseudootophora. Narrow rays that occurred in the secondary xylem increased with increasing stem diameter. The vessels dispersed throughout the stem were semi-ring-porous in most species but ring-porous in others. No species had diffuse porous vessels. The vessel restriction pattern was only found in the two species, C. psilandra and C. tsugetorum. The primary xylem ring was located around the pith of C. uncinata var. uncinata, making its pith cavity hexagonal in shape. Five species had the pith cavity feature. This study provides important basic information about Clematis lianas and addresses their taxonomy, which will help to understand their morphology and to ensure the conservation of their diversity.
format	article
author	Sheng-Zehn Yang Po-Hao Chen Chien-Fan Chen
author_facet	Sheng-Zehn Yang Po-Hao Chen Chien-Fan Chen
author_sort	Sheng-Zehn Yang
title	Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan
title_short	Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan
title_full	Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan
title_fullStr	Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan
title_full_unstemmed	Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan
title_sort	stem cambial variants of the clematis species (ranunculaceae) in taiwan
publisher	National Taiwan University
publishDate	2021
url	https://doaj.org/article/c7df7f9c3dcf495ebc8521d8bfbfe643
work_keys_str_mv	AT shengzehnyang stemcambialvariantsoftheclematisspeciesranunculaceaeintaiwan AT pohaochen stemcambialvariantsoftheclematisspeciesranunculaceaeintaiwan AT chienfanchen stemcambialvariantsoftheclematisspeciesranunculaceaeintaiwan
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Stem cambial variants of the Clematis species (Ranunculaceae) in Taiwan

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