Branch regeneration induced by sever damage in the brown alga Dictyota dichotoma (dictyotales, phaeophyceae)

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 . S...

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Bibliographic Details
Published in:Protoplasma 2017-05, Vol.254 (3), p.1341-1351
Main Authors: Tanaka, Atsuko, Hoshino, Yoichiro, Nagasato, Chikako, Motomura, Taizo
Format: Article
Language:English
Subjects:
Biomedical and Life Sciences
Cell Biology
Cell Differentiation - physiology
Cell Transdifferentiation - physiology
Dictyota dichotoma
Dictyotales
Life Sciences
Original Article
Phaeophyceae
Phaeophyceae - growth & development
Phaeophyceae - physiology
Plant Epidermis - cytology
Plant Sciences
Regeneration - physiology
Signal Transduction - physiology
Zoology
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Summary: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.
ISSN:0033-183X
1615-6102
DOI:10.1007/s00709-016-1025-4