https://doi.pangaea.de/10.1594/PANGAEA.996553Steiner, NikoNikoSteiner0000-0003-2559-5891Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenNilsen, Anne MAnne MNilsenNord UniversityGauci, ClémentClémentGauciNord UniversityJueterbock, AlexanderAlexanderJueterbock0000-0002-0659-3172Nord UniversityBartsch, InkaInkaBartsch0000-0001-7609-2149Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, BremerhavenPANGAEA2026heat stressheatwaveKelpLaboratory experimentthermal primingthermal toleranceEvent labelType of studyDateDay of experimentTreatmentTreatment: temperatureReplicateSurvivalSporophyte blade area, totalSporophyte blade area, healthyLaboratory experimentVisual observationImage analysis NIH ImageJPulse-Amplitude-Modulated (PAM) fluorometer, WALZ GmbH, Germany, M-Series2024-06-24T00:00:00/2024-07-08T00:00:00Datasethttps://doi.pangaea.de/10.1594/PANGAEA.99654710.3354/meps152532540 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalWe assessed the heat tolerance of juvenile Saccharina latissima sporophytes under heat stress and in response to sporopyhte priming. Gametogenesis of gametophytes (Spitsbergen 2011, 2015; 5°C clonal culture, n = 5) was induced at 5°C and sporophytes reared for 6 months. Sporophytes were distributed to three treatment groups. A 17-day heat wave (from 5°C to 20°C and back) followed by a 1-day priming trigger at 21.5°C (HWT); 17 days at 10°C and a 1-day priming trigger (T); a control remaining at 10°C throughout (C). All groups were subjected to a 7-day heat stress treatment at 20°C, 21.5°C, 23°C, and 25°C, where we measured Fv/Fm, percentage of healthy area and survival. All laboratory experiments were carried out at the Alfred Wegener Institute in Bremerhaven, from January to July 2024.8.5805253.53327The Research Council of Norwayhttps://doi.org/10.13039/501100005416334327KELPRIME - Priming as a kelp engineering technology to enhance yield and secure production under environmental challenges