Occurrence of Atypical Phellem in Representatives of Cornus. Myśkow, E. 175(3):328–335. ![Occurrence of Atypical Phellem in Representatives of Cornus [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Premise of research. Epidermis and periderm protect internal plant tissues against environmental factors, water loses, and pathogen entry. Formation of periderm, which replaces epidermis in ontogeny, is generally known; however, the mechanisms involved in this process, as well as the deposition of cutin and suberin in the cell walls of protective tissues, are still poorly understood and require detailed analyses. Thus, in this research, the origin and activity of the first phellogen and the resulting structure of periderm are examined in five species of Cornus.Methodology. Analyses were performed based on the series of transverse sections of 1- to 10-yr-old branches. Various staining reactions were coupled with the autofluorescence in UV light to show the differences in the structure and chemical composition of periderm.Pivotal results. In analyzed species, two different mechanisms orchestrate the process of periderm development. In some species a continuous cylinder of periderm is rapidly formed in the second year of growth, whereas in other species the initiation of periderm is delayed, up to 8-10 yr. In the latter case, stems are covered by epidermis, although lenticels are formed in some locations, even in 1-yr-old branches. Then, lenticels increase in size, fuse, and replace the epidermis. Periderm formed in this way is not continuous. Additionally, in Cornus sanguinea and C. controversa, an atypical layer of nonsuberized phellem cells (phelloids) is formed at the end of each growing season. The external walls of these cells differ in structure and chemical composition from other phellem cells, resembling the cuticle.Conclusions. The presence of the atypical cuticle-like layer in phellem cells, which has not been earlier described, was revealed in C. controversa and C. sanguinea. It is postulated that this atypical layer may increase the protective value of periderm.
@article{myskowOccurrenceAtypicalPhellem2014,
title = {Occurrence of {{Atypical Phellem}} in {{Representatives}} of {{Cornus}}},
author = {Myśkow, Elżbieta},
date = {2014-03},
journaltitle = {International Journal of Plant Sciences},
volume = {175},
pages = {328--335},
issn = {1058-5893},
doi = {10.1086/674447},
url = {https://doi.org/10.1086/674447},
abstract = {Premise of research.\hspace{1em}Epidermis and periderm protect internal plant tissues against environmental factors, water loses, and pathogen entry. Formation of periderm, which replaces epidermis in ontogeny, is generally known; however, the mechanisms involved in this process, as well as the deposition of cutin and suberin in the cell walls of protective tissues, are still poorly understood and require detailed analyses. Thus, in this research, the origin and activity of the first phellogen and the resulting structure of periderm are examined in five species of Cornus.Methodology.\hspace{1em}Analyses were performed based on the series of transverse sections of 1- to 10-yr-old branches. Various staining reactions were coupled with the autofluorescence in UV light to show the differences in the structure and chemical composition of periderm.Pivotal results.\hspace{1em}In analyzed species, two different mechanisms orchestrate the process of periderm development. In some species a continuous cylinder of periderm is rapidly formed in the second year of growth, whereas in other species the initiation of periderm is delayed, up to 8-10 yr. In the latter case, stems are covered by epidermis, although lenticels are formed in some locations, even in 1-yr-old branches. Then, lenticels increase in size, fuse, and replace the epidermis. Periderm formed in this way is not continuous. Additionally, in Cornus sanguinea and C. controversa, an atypical layer of nonsuberized phellem cells (phelloids) is formed at the end of each growing season. The external walls of these cells differ in structure and chemical composition from other phellem cells, resembling the cuticle.Conclusions.\hspace{1em}The presence of the atypical cuticle-like layer in phellem cells, which has not been earlier described, was revealed in C. controversa and C. sanguinea. It is postulated that this atypical layer may increase the protective value of periderm.},
keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13057426,cornus-spp,forest-resources,plant-physiology},
number = {3}
}
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Thus, in this research, the origin and activity of the first phellogen and the resulting structure of periderm are examined in five species of Cornus.Methodology. Analyses were performed based on the series of transverse sections of 1- to 10-yr-old branches. Various staining reactions were coupled with the autofluorescence in UV light to show the differences in the structure and chemical composition of periderm.Pivotal results. In analyzed species, two different mechanisms orchestrate the process of periderm development. In some species a continuous cylinder of periderm is rapidly formed in the second year of growth, whereas in other species the initiation of periderm is delayed, up to 8-10 yr. In the latter case, stems are covered by epidermis, although lenticels are formed in some locations, even in 1-yr-old branches. Then, lenticels increase in size, fuse, and replace the epidermis. Periderm formed in this way is not continuous. Additionally, in Cornus sanguinea and C. controversa, an atypical layer of nonsuberized phellem cells (phelloids) is formed at the end of each growing season. The external walls of these cells differ in structure and chemical composition from other phellem cells, resembling the cuticle.Conclusions. The presence of the atypical cuticle-like layer in phellem cells, which has not been earlier described, was revealed in C. controversa and C. sanguinea. 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Formation of periderm, which replaces epidermis in ontogeny, is generally known; however, the mechanisms involved in this process, as well as the deposition of cutin and suberin in the cell walls of protective tissues, are still poorly understood and require detailed analyses. Thus, in this research, the origin and activity of the first phellogen and the resulting structure of periderm are examined in five species of Cornus.Methodology.\\hspace{1em}Analyses were performed based on the series of transverse sections of 1- to 10-yr-old branches. Various staining reactions were coupled with the autofluorescence in UV light to show the differences in the structure and chemical composition of periderm.Pivotal results.\\hspace{1em}In analyzed species, two different mechanisms orchestrate the process of periderm development. 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