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Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait
Although both the petiole and lamina of foliage leaves have been thoroughly studied, the transition zone between them has often been overlooked. We aimed to identify objectively measurable morphological and anatomical criteria for a generally valid definition of the petiole–lamina transition zone by...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8071152/ https://www.ncbi.nlm.nih.gov/pubmed/33920846 http://dx.doi.org/10.3390/plants10040774 |
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author | Langer, Max Speck, Thomas Speck, Olga |
author_facet | Langer, Max Speck, Thomas Speck, Olga |
author_sort | Langer, Max |
collection | PubMed |
description | Although both the petiole and lamina of foliage leaves have been thoroughly studied, the transition zone between them has often been overlooked. We aimed to identify objectively measurable morphological and anatomical criteria for a generally valid definition of the petiole–lamina transition zone by comparing foliage leaves with various body plans (monocotyledons vs. dicotyledons) and spatial arrangements of petiole and lamina (two-dimensional vs. three-dimensional configurations). Cross-sectional geometry and tissue arrangement of petioles and transition zones were investigated via serial thin-sections and µCT. The changes in the cross-sectional geometries from the petiole to the transition zone and the course of the vascular bundles in the transition zone apparently depend on the spatial arrangement, while the arrangement of the vascular bundles in the petioles depends on the body plan. We found an exponential acropetal increase in the cross-sectional area and axial and polar second moments of area to be the defining characteristic of all transition zones studied, regardless of body plan or spatial arrangement. In conclusion, a variety of terms is used in the literature for describing the region between petiole and lamina. We prefer the term “petiole–lamina transition zone” to underline its three-dimensional nature and the integration of multiple gradients of geometry, shape, and size. |
format | Online Article Text |
id | pubmed-8071152 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-80711522021-04-26 Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait Langer, Max Speck, Thomas Speck, Olga Plants (Basel) Article Although both the petiole and lamina of foliage leaves have been thoroughly studied, the transition zone between them has often been overlooked. We aimed to identify objectively measurable morphological and anatomical criteria for a generally valid definition of the petiole–lamina transition zone by comparing foliage leaves with various body plans (monocotyledons vs. dicotyledons) and spatial arrangements of petiole and lamina (two-dimensional vs. three-dimensional configurations). Cross-sectional geometry and tissue arrangement of petioles and transition zones were investigated via serial thin-sections and µCT. The changes in the cross-sectional geometries from the petiole to the transition zone and the course of the vascular bundles in the transition zone apparently depend on the spatial arrangement, while the arrangement of the vascular bundles in the petioles depends on the body plan. We found an exponential acropetal increase in the cross-sectional area and axial and polar second moments of area to be the defining characteristic of all transition zones studied, regardless of body plan or spatial arrangement. In conclusion, a variety of terms is used in the literature for describing the region between petiole and lamina. We prefer the term “petiole–lamina transition zone” to underline its three-dimensional nature and the integration of multiple gradients of geometry, shape, and size. MDPI 2021-04-15 /pmc/articles/PMC8071152/ /pubmed/33920846 http://dx.doi.org/10.3390/plants10040774 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Langer, Max Speck, Thomas Speck, Olga Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait |
title | Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait |
title_full | Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait |
title_fullStr | Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait |
title_full_unstemmed | Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait |
title_short | Petiole-Lamina Transition Zone: A Functionally Crucial but Often Overlooked Leaf Trait |
title_sort | petiole-lamina transition zone: a functionally crucial but often overlooked leaf trait |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8071152/ https://www.ncbi.nlm.nih.gov/pubmed/33920846 http://dx.doi.org/10.3390/plants10040774 |
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