title: UVB radiation induces changes in the ultra-structure of Iridaea cordata.
abstract: Iridaea cordata cultivated in the presence of UVB radiation (UVBR) was studied using transmission electron microscopy. Apical segments were cultivated in 0.97Wm(-2) of UVBR for 40 days, 3h a day, and compared to a negative control (UVBR absent). UVBR caused modifications, mainly in the cortical cells, including an increased number of cell wall-producing vesicles, in addition to thicker and denser cellular walls, compared to the control. Additionally, cells were observed with an irregular contour and without defined organelles. The increase of cell-wall thickness could be interpreted as an acclimation to UVBR, which could lead to protection from this radiation.
authors.affiliation: Departamento de Ciencias, Universidad de Magallanes, Chile.
authors.forename: Nelso P
authors.initials: NP
authors.lastname: Navarro
authors.forename: Andrés
authors.initials: A
authors.lastname: Mansilla
authors.forename: Estela M
authors.initials: EM
authors.lastname: Plastino
mesh_terms: D002473:Cell Wall / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D015388:Organelles / Q000648:ultrastructure; D000461:Rhodophyta / Q000528:radiation effects* / Q000648:ultrastructure*; D014466:Ultraviolet Rays