Photoperiodic long-day control of sporophyll and hair formation in the brown alga Undaria pinnatifida

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	Photoperiodic long-day control of sporophyll and hair formation in the brown alga Undaria pinnatifida
	Pang, SJ ; Luning, K
	2004-03-01
发表期刊	JOURNAL OF APPLIED PHYCOLOGY
ISSN	0921-8971
卷号	16 期号:2 页码:83-92
文章类型	Article
摘要	Two photoperiodic responses, the development of sporophylls and hairs, have been quantified in sporophytes of the brown alga Undaria pinnatifida. In a final experiment, the algae were cultivated in outdoor, 2000-L seawater tanks in a greenhouse for up to 12 weeks, and daylength was regulated by automatic blinds mounted on top of the tanks. Vegetative young sporophytes were treated under short-day (SD; 8 h light per day) or long-day conditions (LD; 16 h light per day), at 12 h light per day or in a night-break regime (NB; 8 h light per day, 7.5 h dark, 1 h light, 7.5 h dark). The earliest sporophyll development was observed 6, 7 or 9 weeks under LD, NB or SD conditions, respectively. After 12 weeks the sporophylls were significantly longer and wider under LD or NB conditions than in the SD regime, and only half of the experimental algae had formed sporophylls under SD conditions, but all algae under LD or NB conditions. In a foregoing 7-week culture experiment performed in 300-L indoor tanks, enhanced sporophyll formation had also been observed under LD and not under SD conditions (NB omitted). In both experiments, blade elongation rates remained high until the end of the experiments in SD, but declined during sporophyll initiation in LD, NB or at 12 h light per day. Another difference caused by photoperiod was observed in regard to the development of surface hair spots which occurred in both experiments on the blades in LD, NB or at 12 h light per day with identical densities, but were completely lacking under SD conditions. It is concluded that U. pinnatifida is a facultatative long-day plant in regard to reproduction forming vigorously sporophylls in long days, and an obligate long-day plant in regard to hair formation.; Two photoperiodic responses, the development of sporophylls and hairs, have been quantified in sporophytes of the brown alga Undaria pinnatifida. In a final experiment, the algae were cultivated in outdoor, 2000-L seawater tanks in a greenhouse for up to 12 weeks, and daylength was regulated by automatic blinds mounted on top of the tanks. Vegetative young sporophytes were treated under short-day (SD; 8 h light per day) or long-day conditions (LD; 16 h light per day), at 12 h light per day or in a night-break regime (NB; 8 h light per day, 7.5 h dark, 1 h light, 7.5 h dark). The earliest sporophyll development was observed 6, 7 or 9 weeks under LD, NB or SD conditions, respectively. After 12 weeks the sporophylls were significantly longer and wider under LD or NB conditions than in the SD regime, and only half of the experimental algae had formed sporophylls under SD conditions, but all algae under LD or NB conditions. In a foregoing 7-week culture experiment performed in 300-L indoor tanks, enhanced sporophyll formation had also been observed under LD and not under SD conditions (NB omitted). In both experiments, blade elongation rates remained high until the end of the experiments in SD, but declined during sporophyll initiation in LD, NB or at 12 h light per day. Another difference caused by photoperiod was observed in regard to the development of surface hair spots which occurred in both experiments on the blades in LD, NB or at 12 h light per day with identical densities, but were completely lacking under SD conditions. It is concluded that U. pinnatifida is a facultatative long-day plant in regard to reproduction forming vigorously sporophylls in long days, and an obligate long-day plant in regard to hair formation.
关键词	Algal Hairs Long-day Effect Photoperiodism Sporophylls Undaria Pinnatifida Wakame
学科领域	Biotechnology & Applied Microbiology ; Marine & Freshwater Biology
收录类别	SCI
语种	英语
WOS记录号	WOS:000224436600001
引用统计	被引频次：20[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/337002/3208
专题	实验海洋生物学重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 2666071, Peoples R China 2.Stiftung Alfred Wegener Inst Polar & Meeresforsch, Wattenmeerstn Sylt, D-25992 List Auf Sylt, Germany
推荐引用方式 GB/T 7714	Pang, SJ,Luning, K. Photoperiodic long-day control of sporophyll and hair formation in the brown alga Undaria pinnatifida[J]. JOURNAL OF APPLIED PHYCOLOGY,2004,16(2):83-92.
APA	Pang, SJ,&Luning, K.(2004).Photoperiodic long-day control of sporophyll and hair formation in the brown alga Undaria pinnatifida.JOURNAL OF APPLIED PHYCOLOGY,16(2),83-92.
MLA	Pang, SJ,et al."Photoperiodic long-day control of sporophyll and hair formation in the brown alga Undaria pinnatifida".JOURNAL OF APPLIED PHYCOLOGY 16.2(2004):83-92.

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