Effect of light period on egg-discharge of gametophyte clones of Undaria pinnatifida (Phaeophyta)

doi:10.1007/s10811-005-5560-1

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	Effect of light period on egg-discharge of gametophyte clones of Undaria pinnatifida (Phaeophyta)
	Liu, JX; Dong, LF; Shen, YQ; Wu, CY
	2004-12-01
发表期刊	JOURNAL OF APPLIED PHYCOLOGY
ISSN	0921-8971
卷号	16 期号:6 页码:519-521
文章类型	Article
摘要	A sporeling culture method using gametophyte clones developed in the early 1990s led to egg discharge occurring in the dark 5 min after the start of the dark period under growth under a 11:13 L-D photoperiod. The course of egg discharge could be disturbed by light, with irradiance as low as 5-6 mu mol photon m(-2) s(-1) causing 75-80% of the discharged eggs to detach from the oogonia and consequently to die within several hours. In order to enhance outgrowth rate of young sporophytes, a study was conducted to test the effect of controlling darkness in the period 2-3 h after dusk. When the slides were transferred from the standard 11:13 L-D regime to continuous light, eggs were discharged 5 min after the end of the light phase and peaked 5-l5 min later on first day after transfer, indicating that the female gametes "remember" the light-dark regime. This suggests the existence of an endogenous circadian rhythm. During the second and third days, very few eggs were discharged throughout the 11 h of the normal light phase of the L-D regime, indicating the inhibitory effect of continuous light and that the rhtyhm is easily damped by light.; A sporeling culture method using gametophyte clones developed in the early 1990s led to egg discharge occurring in the dark 5 min after the start of the dark period under growth under a 11:13 L-D photoperiod. The course of egg discharge could be disturbed by light, with irradiance as low as 5-6 mu mol photon m(-2) s(-1) causing 75-80% of the discharged eggs to detach from the oogonia and consequently to die within several hours. In order to enhance outgrowth rate of young sporophytes, a study was conducted to test the effect of controlling darkness in the period 2-3 h after dusk. When the slides were transferred from the standard 11:13 L-D regime to continuous light, eggs were discharged 5 min after the end of the light phase and peaked 5-l5 min later on first day after transfer, indicating that the female gametes "remember" the light-dark regime. This suggests the existence of an endogenous circadian rhythm. During the second and third days, very few eggs were discharged throughout the 11 h of the normal light phase of the L-D regime, indicating the inhibitory effect of continuous light and that the rhtyhm is easily damped by light.
关键词	Circadian Rhythm Egg Discharge Gametophyte Clone Sporeling Culture Undaria Pinnatifida
学科领域	Biotechnology & Applied Microbiology ; Marine & Freshwater Biology
DOI	10.1007/s10811-005-5560-1
URL	查看原文
收录类别	ISTP ; SCI
语种	英语
WOS记录号	WOS:000230724000015
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/3202
专题	实验海洋生物学重点实验室
作者单位	Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Liu, JX,Dong, LF,Shen, YQ,et al. Effect of light period on egg-discharge of gametophyte clones of Undaria pinnatifida (Phaeophyta)[J]. JOURNAL OF APPLIED PHYCOLOGY,2004,16(6):519-521.
APA	Liu, JX,Dong, LF,Shen, YQ,&Wu, CY.(2004).Effect of light period on egg-discharge of gametophyte clones of Undaria pinnatifida (Phaeophyta).JOURNAL OF APPLIED PHYCOLOGY,16(6),519-521.
MLA	Liu, JX,et al."Effect of light period on egg-discharge of gametophyte clones of Undaria pinnatifida (Phaeophyta)".JOURNAL OF APPLIED PHYCOLOGY 16.6(2004):519-521.

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