Data/hora: 08/06/2024 13:35:56

Provedor de dados: | 39
País: | Brazil
Título: | Early development of epiphytic roots: perspectives based on the composition of the velamen cell wall
Autores: | Lana,Luísa Gouveia; Silva,Ana Flávia de Melo; Buss,Aldineia; Oliveira,Denis Coelho de; Moreira,Ana Silvia Franco Pinheiro.
Data: | 2020-12-01
Ano: | 2020
Palavras-chave: | Cattleya; Orchidaceae; Pectins; Root meristem; Velamen development.
Resumo: | ABSTRACT The velamen, a root structure of some epiphytic species for water uptake, usually is stratified epidermis consisting of dead cells. In general, its cell walls exhibit variation during development, including in thickness and amount and type of impregnated substances. These changes result in diverse physical and chemical properties that can serve in water and nutrient uptake, as well as in mechanical support and protection. On this basis, the main objective of the current study was to describe the composition of the cell walls of the velamen during the development of the roots of four species of Cattleya. Anatomical, histochemical and immunocytochemical analyses were performed with samples (n=3 individuals per species) of meristematic, developing, and mature regions of the root. The development of the primary wall led to the deposition of pectins as highly methylesterified homogalacturonans, which were demetihylesterified with maturation of the velamen. The deposition of lipids (and subsequently lignins) in velamen cells marked a transition stage to the formation of the secondary wall, which gives rigidity to the tissue. For the first time, we showed that the deposition of lipids and lignins began close to the exodermis in the direction of the epivelamen.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400633
Editor: | Sociedade Botânica do Brasil
Relação: | 10.1590/0102-33062020abb0140
Formato: | text/html
Fonte: | Acta Botanica Brasilica  v.34 n.4 2020
Fonte: | info:eu-repo/semantics/openAccess