Evaluation of Heterosis of Growth and Photosynthetic Efficiency in Hybrid Offsprings from Multiple Crosses between Northern and Southern Kelp Laminaria japonica Cultivars in China
SONG Guiwen1, HUANG Xiang1, ZHANG Di2, YAN Yu1, JIN Haiping1, XU Yuanyuan1, DAI Hongliang3, LIU Fuli1
1. Key Laboratory of Marine Genetics and Breeding, Ministry of Education, College of Marine Life Science, Ocean University of China, Qingdao 266003, China; 2. Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266003, China; 3. Yantai Fenghong Marine Seedling Industry Co., Ltd, Yantai 265617, China
Abstract：The female and male gametophytes of kelp Laminaria japonica Lianza 1 and Haijia 1 in the southern seas, 901, Yudai 1 and Dongfang 7 in the northern seas were cultured in solutions with final concentrations of 4 mg/L N and 0.4 mg/L P in sterilized seawater at 1600 lx (16L∶8D) and 10 ℃, and the gametophyte cloning and multiplication and self-breeding of various varieties were carried out by shaking culture. By comparing the growth rate and anti-high-light ability of the hybrid offspring, the heterosis characteristics of cross-breeding with different parental combinations were evaluated, and the mechanism of heterosis formation of high-light tolerance of kelp was probed by photosynthetic physiology to provide a basis for the breeding of high light-resistant varieties. The results showed that significant high-parent heterosis was observed in only a few crossing combinations, with mid-parent heterosis in most hybrid offsprings, indicating that crossing did not necessarily produce heterosis in growth and stress resistance. The 5—10 cm length seedlings had the maximum growth light intensity of 13 600 lx, and crossing and reciprocal crossing had a significant impact on the growth rate and high light resistance of hybrid offspring. The growth rate and high light resistance of offspring were shown to be more similar to their female parent self-cross group. The findings provide new ideas and evidence for cross breeding of kelp to cultivate high light-resistant varieties.
宋桂文, 黄翔, 张娣, 颜雨, 金海平, 徐园园, 戴宏亮, 刘福利. 多组中国南、北方海带品种杂交后代生长和光合效率的杂种优势评价[J]. 水产科学, 2025, 44(2): 202-211.
SONG Guiwen, HUANG Xiang, ZHANG Di, YAN Yu, JIN Haiping, XU Yuanyuan, DAI Hongliang, LIU Fuli. Evaluation of Heterosis of Growth and Photosynthetic Efficiency in Hybrid Offsprings from Multiple Crosses between Northern and Southern Kelp Laminaria japonica Cultivars in China. Fisheries Science, 2025, 44(2): 202-211.
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2025, Vol. 44 
