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

doi:10.16378/j.cnki.1003-1111.24018

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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.

Key words： Laminaria japonica heterosis high light resistance hybridization chlorophyll fluorescence

Received: 19 January 2024

S968.42

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	Articles by authors
	SONG Guiwen
	HUANG Xiang
	ZHANG Di
	YAN Yu
	JIN Haiping
	XU Yuanyuan
	DAI Hongliang
	LIU Fuli

Cite this article:

SONG Guiwen,HUANG Xiang,ZHANG Di, et al. Evaluation of Heterosis of Growth and Photosynthetic Efficiency in Hybrid Offsprings from Multiple Crosses between Northern and Southern Kelp Laminaria japonica Cultivars in China[J]. Fisheries Science, 2025, 44(2): 202-211.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.24018 OR https://www.shchkx.com/EN/Y2025/V44/I2/202

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