Mucilage cells in the flower of Rosales species: reflections on morphological diversity, classification, and functions.

Autor: De Barros TC; Departamento de Biologia, Centro de Ciências da Natureza, Universidade Federal do Piauí, Avenida Universitária, Lado Ímpar, Teresina, PI, 64049-550, Brazil., Leite VG; DIPEQ, Instituto de Pesquisas Jardim Botânico Do Rio de Janeiro, Rua Pacheco Leão, 915, Rio de Janeiro, RJ, 22460-030, Brazil.; Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. Do Café, S/N, Ribeirão Preto, SP, 14040-903, Brazil., Pedersoli GD; Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. Do Café, S/N, Ribeirão Preto, SP, 14040-903, Brazil., Leme FM; Laboratório de Botânica, Instituto de Biociências, Universidade Federal de Mato Grosso Do Sul, Cidade Universitária, Caixa Postal 549, Campo Grande, MS, 79070-900, Brazil., Marinho CR; Real Jardín Botánico, CSIC, 28014, Madrid, Spain., Teixeira SP; Departamento de Ciências Farmacêuticas, Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. Do Café, S/N, Ribeirão Preto, SP, 14040-903, Brazil. spadua@fcfrp.usp.br.
Jazyk: angličtina
Zdroj: Protoplasma [Protoplasma] 2023 Jul; Vol. 260 (4), pp. 1135-1147. Date of Electronic Publication: 2023 Jan 13.
DOI: 10.1007/s00709-023-01836-8
Abstrakt: The presence of mucilage cells in plants, studied mainly in vegetative organs, is a condition shared by several taxonomic groups and aspects related to their diversity have been discussed with systematic purposes. This study explores the flower distribution and classification of mucilage cells in Rosales species, with inferences about flower functions. Floral buds from fifty-seven species representing seven of nine families recognized in the Rosales were sampled and processed for light and transmission electron microscopy. Mucilage cells were found in about 40% of the studied species of Cannabaceae, Rhamnaceae, Ulmaceae, and Urticaceae families, whereas no floral mucilage cells were found in species of Elaeagnaceae, Moraceae, and Rosaceae. Mucilage cells were found in the epidermis and internal tissues of many organs of different floral morph types. There is a great diversity of forms of presentation of mucilage in cells, from smaller individualized single cells to very bulky cells and to completely filled mucilage reservoirs. In some cases, cells with mucilage apparently in the cell wall and others with mucilage in the vacuole seem to occur side by side. This diversity challenges the existing classifications of mucilage cells and reinforces the importance of ontogenetic and ultrastructural studies following the path of mucilage in cells in order to propose a more natural classification and to elucidate the evolution of mucilage cells in plants.
(© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.)
Databáze: MEDLINE
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