Back to Search
Start Over
Defense mechanisms of sargassacean species against the epiphytic red alga Neosiphonia harveyi.
Defense mechanisms of sargassacean species against the epiphytic red alga Neosiphonia harveyi.
- Source :
-
Journal of Phycology . Aug2015, Vol. 51 Issue 4, p695-705. 11p. 1 Color Photograph, 2 Black and White Photographs, 2 Charts, 4 Graphs. - Publication Year :
- 2015
-
Abstract
- Flora diversity and abundance of epiphytes are specific to their basiphyte species and may relate to variations in the defensive abilities of basiphytes. Thus, investigating the interactions between epiphytes and basiphytes is useful for a better understanding of the biological impact of epiphytism and the survival strategies of basiphytes. We examined the epiphyte density on five sargassacean species at six locations between two study sites, which showed that the epiphytic red alga Neosiphonia harveyi was remarkably less abundant on Sargassum siliquastrum at all locations. To assess its defense mechanism against N. harveyi, we performed bioassays of phlorotannins, which are considered effective in deterring fouling, by culturing sargassacean blades with N. harveyi carpospores and observed the process by which sargassacean blades remove epiphytes. When the carpospores were incubated with various concentrations of dissolved phlorotannins, settlement and germination were inhibited only at the highest concentrations (>0.1 g · L−1), and this effect did not significantly differ among the five sargassacean species. When the carpospores were combined with blades from the five species, many of the spores attached and germinated on every blade. Because N. harveyi penetrated rhizoids into basiphyte tissues, cuticle peeling observed in all five sargassacean species could not remove this epiphyte after germination. However, in S. siliquastrum, the blade tissues around the germlings became swollen and disintegrative, and were removed together with the germlings. The spores normally grew on the dead blades, suggesting that the tissue degradation of S. siliquastrum is triggered by the infection of N. harveyi. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ALGAE defenses
*ALGAE
*BIODIVERSITY
*SARGASSACEAE
*EPIPHYTES
*RED algae
*PHYCOLOGY
Subjects
Details
- Language :
- English
- ISSN :
- 00223646
- Volume :
- 51
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- Journal of Phycology
- Publication Type :
- Academic Journal
- Accession number :
- 108899771
- Full Text :
- https://doi.org/10.1111/jpy.12311