Effects of temperature and light on the growth and reproduction of an endophytic pest alga Ectocarpus siliculosus (Ectocarpales) found in wild Gracilaria textorii (Gracilariales) SCIE SCOPUS

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Title
Effects of temperature and light on the growth and reproduction of an endophytic pest alga Ectocarpus siliculosus (Ectocarpales) found in wild Gracilaria textorii (Gracilariales)
Author(s)
Li, Huiru; Kim, Hawon; Shin, Kyoung Soon; Hyun, Bonggil; Kim, Young Sik; Kim, Ju-Hyoung
KIOST Author(s)
Shin, Kyoung Soon(신경순)Hyun, Bonggil(현봉길)
Alternative Author(s)
신경순; 현봉길
Publication Year
2022-11
Abstract
The genus Gracilaria is an economically important macroalgae group that has been cultivated worldwide on a commercial scale. Epiphytic algae are commonly found in both natural and cultured Gracilaria and have become one of the major concerns in the Gracilaria aquaculture. In contrast to the wide reports of epiphytic pests, the endophytic algae inGracilaria have rarely been reported. In this study, we isolated the brown filamentous endophytic macroalgae Ectocarpus siliculosus from the host wild Gracilaria textorii to investigate its growth and reproduction capability under environmental changes. We studied the effects of various temperatures and light levels on growth and reproduction for 12 days. The results revealed that the highest growth rate (26.65 ± 1.78 day−1) of the endophytic pest E. siliculosus was at 25 °C and 50 μmol photons m−2 s−1. Furthermore, the gametangium/sporangium formation and gamete/spore release of the pest E. siliculosus preferred 20 °C with medium and high light intensities. In contrast, the worst performances of growth (3.34 ± 0.49 day−1) and reproduction (0.13 ± 0.09 gametangia/sporangia) occurred at the highest temperature (25 °C) and light level (100 μmol photons m−2 s−1). Our study indicate that optimal temperature can stimulate the rapid growth of E. siliculosus, and the strategy of living inside seaweed helps E. siliculosus avoid the excessive sunlight, which is especially critical for the ones inhabiting on the intertidal rocks. The physiological characteristics of endophytic E. siliculosus may help to inform the best pest management strategies for Gracilaria aquaculture. © 2022 Elsevier B.V.
ISSN
0044-8486
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/43035
DOI
10.1016/j.aquaculture.2022.738526
Bibliographic Citation
Aquaculture, v.560, 2022
Publisher
Elsevier B.V.
Keywords
Ectocarpus siliculosus; Endophytic algae; Gracilaria textorii; Growth; Light; Temperature
Type
Article
Language
English
Document Type
Article
Publisher
Elsevier B.V.
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