Consulta: subjectFacets:"Companion cells"
Registros recuperados: 1
Data/hora: 02/06/2024 05:19:36

Role of intermediary cells in Peltodon radicans (Lamiaceae) in the transfer of calcium and formation of calcium oxalate crystals
Provedor de dados: Brazilian Archives of Biology and Technology
Autores: Paiva,Elder Antônio Sousa; Machado,Silvia Rodrigues.
With the objective of studying the connection between calcium oxalate crystals formation and the phloem, fragments of leaves of Peltodon radicans Pohl (Lamiaceae) were fixed and processed, for light and electron-transmission microscopes. It was observed that the crystals occurred in the cells of the bundle sheath, juxtaposed in relation to the phloem. Intermediary cells established a connection between the sieve element and crystal-bearing sheath cells. Calcium was present abundantly in the cytoplasm of sheath cells as calcium oxalate crystals. The presence of calcium was also detected in the intermediary cells, but in the sieve elements it was not detected. There was, therefore, an increasing concentration gradient of calcium in the sieve elements from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium oxalate; Calcium metabolism; Companion cells; Crystals; Peltodon radicans; Phloem.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000100019