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Growth-promoting bacteria for the green seaweed Ulva clathrata

Abstract : Seaweed production represents one of the rising activities in the aquaculture industry. This study explores the impact of bacteria associated with the growth of Ulva clathrata, a promising alga in the field of food and bioremediation. Fifty-six bacteria isolated from four seaweed (Caulerpa sp., Gracilaria sp., Ulva lactuca and U. clathrata) were tested to evaluate their effect on U. clathrata growth. Eight of them showed a significant growth-promoting effect (p < .05). Isolates Ul-11 and Ul-12 from U. lactuca induced an increase of 73 and 81% of growth respectively. They were classified as Reugeria sp. and Alteromonas sp. based on 16S DNA sequencing (>95.0% sequence identity). Multiple combinations of the growth-promoting bacteria were also tested on U. clathrata, and the best result was achieved by combining Ca-3/Uc-18/Ul-12 isolates with a significant increase in seaweed growth of up to 76%; however, no synergistic effect was observed compared to Ul-12 alone. Scanning electron microscopy revealed no alteration in the cell wall of U. clathrata when inoculated with selected bacteria, showing an average increase of bacterial density on U. clathrata.
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https://hal.univ-brest.fr/hal-02933524
Contributor : Laurent Hedoin <>
Submitted on : Tuesday, September 8, 2020 - 2:54:19 PM
Last modification on : Wednesday, September 9, 2020 - 10:52:23 AM

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Maxence Gemin, Alberto Pena-Rodriguez, Eduardo Quiroz-Guzman, Paola Magallon-Servin, Diana Barajas-Sandoval, et al.. Growth-promoting bacteria for the green seaweed Ulva clathrata. Aquaculture Research, Wiley, 2019, 50 (12), pp.3741-3748. ⟨10.1111/are.14336⟩. ⟨hal-02933524⟩

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