Can targeted defense elicitation improve seaweed aquaculture?.

Wang, Gaoge, Chang, Lirong, Zhang, Rui, Wang, Shasha, Wei, Xiaojiao, Rickert, Esther, Krost, Peter, Xiao, Luyang and Weinberger, Florian (2019) Can targeted defense elicitation improve seaweed aquaculture?. Open Access Journal of Applied Phycology, 31 (3). pp. 1845-1854. DOI 10.1007/s10811-018-1709-6.

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Diseases increasingly threaten aquaculture of kelps and other seaweeds. At the same time, protection concepts that are based upon application of biocides are usually not applicable, as such compounds would be rapidly diluted in the sea, causing ecological damage. An alternative concept could be the application of immune stimulants to prevent and control diseases in farmed seaweeds. We here present a pilot study that investigated the effects of oligoalginate elicitation on juvenile and adult sporophytes of Saccharina japonica cultivated in China and on adult sporophytes of Saccharina latissima cultivated in Germany. In two consecutive years, treatment with oligoalginate clearly reduced the detachment of S. japonica juveniles from their substrate curtains during the nursery stage in greenhouse ponds. Oligoalginate elicitation also decreased the density of endobionts and the number of bacterial cells on sporophytes of S. latissima that were cultivated on sea-based rafts. However, the treatment increased the susceptibility of kelp adults to settlement of epibionts (barnacles in Germany and filamentous algal epiphytes in China). In addition, oligoalginate elicitation accelerated the aging of S. japonica adults. Based upon these findings, oligoalginate elicitation could be a feasible way to provide “environmentally friendly” protection of kelp juveniles in nurseries. The same treatment causes not only beneficial, but also unwanted effects in adult kelp sporophytes. Therefore, it is not recommended as a treatment after the juvenile stage is completed. Future tests with other elicitors and other cultivated seaweed species may allow for the development of more feasible applications of targeted defense elicitation in seaweed aquaculture.

Document Type: Article
Keywords: Oligoalginate; Seaweed defense elicitation; Pest control; Saccharina japonica; Saccharina latissima; Phaeophyta
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10811-018-1709-6
ISSN: 0921-8971
Date Deposited: 08 Jan 2019 07:37
Last Modified: 13 Jun 2019 08:50

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