围氏马尾藻(Sargassum wightii)周年生长及有性生殖的早期发育研究

doi:10.11978/2024069

Abstract

Abstract:

Sargassum wightii is a common species in the Weizhou Island of Guangxi, Xuwen of Guangdong and other sea areas, and is an economic macroalgae. Understanding the annual growth and early development of macroalgae can predict the mature time of thalli and provide scientific basis for artificial seedling and cultivation of macroalgae. This paper reports the annual growth characteristics, the effect of temperature on ovulation and the early developmental process of sexual reproduction of S. wightii in the sea area of Xuwen, Guangdong. The results show that the annual growth of S. wightii can be divided into 4 periods: fast growing period, mature period, decline period and resting period. The average length of thalli reaches its maximum [(188.32±43.77) cm] in early April, exceeding 180 cm in both April and May, and less than 5 cm in late July to early November. The male and female reproductive parts of S. wightii are in the same receptacle, and the egg cell development belongs to 8-nucleui type. The culture temperature is very important to the ovulation process. Ovulation could not be achieved at 15, 27 and 30 ℃, but could be achieved at 18~24℃. The ovulation time is shortest at 24 ℃, only 3 d. The zygotes develop into germlings with rhizoid buds at 24 ℃ for about 24h, and the seedlings develop a fourth leaflet after 30 d of culture. The results of this study provide basic information for the biology, ecology, artificial seedling and cultivation of S.wightii.

Key words: Sargassum wightii, macroalgae, annual growth, sexual reproduction, early development, ovulation

CLC Number:

Q944

ZENG Zhaojun, SUN Liwei, XIE Enyi. Study on the annual growth and early development of sexual reproduction of Sargassum wightii[J].Journal of Tropical Oceanography, 2025, 44(1): 44-52.

Figures/Tables 6

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培养温度/℃	排卵时间(均值±标准差)/d
15	未见排卵
18	15 ± 1.0
21	10 ± 0.5
24	3 ± 0.5
27	腐烂未排卵
30	腐烂未排卵

Study on the annual growth and early development of sexual reproduction of Sargassum wightii

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