Kelpak® is a seaweed extract from the phaeophyte, Ecklonia maxima, used to enhance growth and production of terrestrial plants. It is also beneficial for some red and green seaweeds. As such, we assessed if Kelpak® could enhance growth and thermal tolerance of the brown seaweeds, Saccharina latissima and S. angustissima. Juvenile sporophytes were dipped (30 or 60 min) in Kelpak® solutions of different concentrations (0.001, 0.005, 0.05, 1, and 5 ml L⁻¹). These sporophytes were then cultivated in half‐strength PES at different temperatures (12, 16, 19, 23 and 25°C ± 1) for 20 days. The surviving sporophytes were then moved to 18 ± 1°C and cultivated for 14 additional days. Results show that temperature was the main factor driving survival and growth. Both species exposed to the temperatures of 23 and 25°C died during the first 7 days. Furthermore, no significant differences were observed in growth of sporophytes at the temperatures of 12 and 16°C. Results also show that treated sporophytes exposed to 18°C, the sublethal temperature, particularly of S. angustissima showed a higher survival and overall vigor than nontreated sporophytes. These results indicate that Kelpak® may enhance thermal tolerance and growth of S. latissima and S. angustissima exposed to sublethal temperatures.

中文翻译：

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探索性评价Kelpak®海藻提取物对栽培海藻糖藻的影响。暴露于亚致死和致死温度

Kelpak®是来自自生植物Ecklonia maxima的海藻提取物，用于增强陆生植物的生长和生产。这对于一些红色和绿色的海藻也是有益的。因此，我们评估了Kelpak®是否可以增强褐藻，Saccharina latissima和S. angustissima的生长和耐热性。将幼小孢子体浸入（30、60分钟）不同浓度（0.001、0.005、0.05、1和5 ml L ^-1的Kelpak®溶液中））。然后将这些孢子体在半强度PES中于不同温度（12、16、19、23和25°C±1）下培养20天。然后将存活的孢子体移至18±1℃并再培养14天。结果表明温度是驱动生存和生长的主要因素。暴露在23和25°C的温度下的两个物种在头7天内死亡。此外，在12和16℃的温度下，孢子体的生长没有观察到显着差异。结果还表明，与未处理的孢子体相比，处理过的孢子体暴露于18°C（亚致死温度）下，特别是对虾的S. angustissima具有更高的存活率和总体活力。这些结果表明，Kelpak®可以提高热耐受性和成长S. latissima和S. angustissima暴露于致死温度下。