Responses of vegetative gametophytes of Undaria pinnatifida to high irradiance in the process of gametogenesis

doi:10.1111/j.1440-1835.2008.00509.x

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	Responses of vegetative gametophytes of Undaria pinnatifida to high irradiance in the process of gametogenesis
	Pang, Shao Jun 1; Shan, Ti Feng 1,2; Zhang, Zhi Huai 1; Pang, SJ, Chinese Acad Sci, Inst Oceanol, Marine Biol Culture Collect Ctr, Qingdao 266071, Peoples R China
	2008-12-01
发表期刊	PHYCOLOGICAL RESEARCH
ISSN	1322-0829
卷号	56 期号:4 页码:280-287
文章类型	Article
摘要	The population of Undaria pinnatifida in its ecologic niche sustains itself in high temperature summer in the form of vegetative gametophytes, the haploid stage in its heteromorphic life cycle. Gametogenesis initiates when seawater temperature drops below the threshold levels in autumn in the northern hemisphere. Given that the temperature may fall into the appropriate range for gametogenesis, the level of irradiance determines the final destiny of a gametophytic cell, either undergoing vegetative cell division or initiating gametogenesis. In elucidating how vegetatively propagated gametophytes cope with changes of irradiance in gametogenesis, we carried out a series of culture experiments and found that a direct exposure to irradiance as high as 270 mu mol photons m(-2) s(-1) was lethal to dim-light (7-10 mu mol photons m(-2) s(-1)) adapted male and female gametophytes. This lethal effect was linearly corelated with the exposure time. However, dim-light adapted vegetative gametophytes were shown to be able tolerate as high as 420 mu mol photons m(-2) s(-1) if the irradiance was steadily increased from dim light levels (7-10 mu mol photons m(-2) s(-1)) to 90, 180 and finally 420 mu mol photons m(-2) s(-1), respectively, at a minimum of 1-3 h intervals. Percentage of female gametophytic cells that turned into oogonia and were eventually fertilized was significantly higher if cultured at higher but not lethal irradiances. Findings of this investigation help to understand the dynamic changes of population size of sporophytic plants under different light climates at different site-specific ecologic niches. It may help to establish specific technical details of manipulation of light during mass production of seedlings by use of vegetatively propagated gametophytes.; The population of Undaria pinnatifida in its ecologic niche sustains itself in high temperature summer in the form of vegetative gametophytes, the haploid stage in its heteromorphic life cycle. Gametogenesis initiates when seawater temperature drops below the threshold levels in autumn in the northern hemisphere. Given that the temperature may fall into the appropriate range for gametogenesis, the level of irradiance determines the final destiny of a gametophytic cell, either undergoing vegetative cell division or initiating gametogenesis. In elucidating how vegetatively propagated gametophytes cope with changes of irradiance in gametogenesis, we carried out a series of culture experiments and found that a direct exposure to irradiance as high as 270 mu mol photons m(-2) s(-1) was lethal to dim-light (7-10 mu mol photons m(-2) s(-1)) adapted male and female gametophytes. This lethal effect was linearly corelated with the exposure time. However, dim-light adapted vegetative gametophytes were shown to be able tolerate as high as 420 mu mol photons m(-2) s(-1) if the irradiance was steadily increased from dim light levels (7-10 mu mol photons m(-2) s(-1)) to 90, 180 and finally 420 mu mol photons m(-2) s(-1), respectively, at a minimum of 1-3 h intervals. Percentage of female gametophytic cells that turned into oogonia and were eventually fertilized was significantly higher if cultured at higher but not lethal irradiances. Findings of this investigation help to understand the dynamic changes of population size of sporophytic plants under different light climates at different site-specific ecologic niches. It may help to establish specific technical details of manipulation of light during mass production of seedlings by use of vegetatively propagated gametophytes.
关键词	Gametogenesis Light Acclimation Reproduction Seaweed Undaria Pinnatifida
学科领域	Marine & Freshwater Biology
DOI	10.1111/j.1440-1835.2008.00509.x
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000260734700006
引用统计	被引频次：8[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/337002/1655
专题	实验海洋生物学重点实验室
通讯作者	Pang, SJ, Chinese Acad Sci, Inst Oceanol, Marine Biol Culture Collect Ctr, Qingdao 266071, Peoples R China
作者单位	1.Chinese Acad Sci, Inst Oceanol, Marine Biol Culture Collect Ctr, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Pang, Shao Jun,Shan, Ti Feng,Zhang, Zhi Huai,et al. Responses of vegetative gametophytes of Undaria pinnatifida to high irradiance in the process of gametogenesis[J]. PHYCOLOGICAL RESEARCH,2008,56(4):280-287.
APA	Pang, Shao Jun,Shan, Ti Feng,Zhang, Zhi Huai,&Pang, SJ, Chinese Acad Sci, Inst Oceanol, Marine Biol Culture Collect Ctr, Qingdao 266071, Peoples R China.(2008).Responses of vegetative gametophytes of Undaria pinnatifida to high irradiance in the process of gametogenesis.PHYCOLOGICAL RESEARCH,56(4),280-287.
MLA	Pang, Shao Jun,et al."Responses of vegetative gametophytes of Undaria pinnatifida to high irradiance in the process of gametogenesis".PHYCOLOGICAL RESEARCH 56.4(2008):280-287.

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