| Title: | "Branch regeneration induced by sever damage in the brown alga Dictyota dichotoma (dictyotales, phaeophyceae)" |
| Author(s): | Tanaka A; Hoshino Y; Nagasato C; Motomura T; |
| Address: | "Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan. atsuko72tanaka@gmail.com. Faculty of Science, University of the Ryukyus, Nishihara, Okinawa, 903-0213, Japan. atsuko72tanaka@gmail.com. Experiment Farm, Field Science Center for Northern Biosphere, Hokkaido University, Sapporo, 060-0811, Japan. Muroran Marine Station, Field Science Center for Northern Biosphere, Hokkaido University, Muroran, 051-0013, Japan" |
| DOI: | 10.1007/s00709-016-1025-4 |
| ISSN/ISBN: | 1615-6102 (Electronic) 0033-183X (Linking) |
| Abstract: | "Tissue wounds are mainly caused by herbivory, which is a serious threat for macro-algae, and brown algae are known to regenerate branches or buds in response to wounding. In the present paper, we describe a branch regeneration system, induced by sever damage, in the brown alga Dictyota dichotoma. Segmentations of juvenile thalli induced branch regenerations unless explants possessed apical cells. Apical excisions in distinct positions elucidated that disruption of an apical cell or disconnection of tissue with an apical cell triggered the branch regeneration. Furthermore, spatial positions of regenerated branches seemed to be regulated by the apical region, which was assumed to generate inhibitory effects for lateral branch regeneration. Mechanical incision, which disrupted tissue continuity with the apical region, induced branch regeneration preferentially below the incision. Although we were unable to identify the candidate inhibitory substance, our results suggested that the apical region may have an inhibitory effect on lateral branch regeneration. Additionally, observations of branch regeneration showed that all epidermal cells in D. dichotoma possess the ability to differentiate into apical cells, directly. This may be the first report of algal transdifferentiation during the wound-stress response" |
| Keywords: | Cell Differentiation/*physiology Cell Transdifferentiation/*physiology Phaeophyta/*growth & development/physiology Plant Epidermis/*cytology Regeneration/*physiology Signal Transduction/physiology Apical dominance Regeneration Signal propagation Transdiff; |
| Notes: | "MedlineTanaka, Atsuko Hoshino, Yoichiro Nagasato, Chikako Motomura, Taizo eng Austria 2016/10/06 Protoplasma. 2017 May; 254(3):1341-1351. doi: 10.1007/s00709-016-1025-4. Epub 2016 Oct 4" |
