UVB radiation induces changes in the ultra-structure of Iridaea cordata.
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.
Navarro
Nelso P
NP
Departamento de Ciencias, Universidad de Magallanes, Chile.
Mansilla
Andrés
A
Plastino
Estela M
EM
D002473:Cell Wall / Q000648:ultrastructure; D046529:Microscopy, Electron, Transmission; D015388:Organelles / Q000648:ultrastructure; D000461:Rhodophyta / Q000528:radiation effects* / Q000648:ultrastructure*; D014466:Ultraviolet Rays