Combined effects of light intensity and NH_4~+-enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera(Chlorophyta)

IOCAS-IR

	Combined effects of light intensity and NH_4~+-enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera(Chlorophyta)
	Xu ZG(徐智广); Wu HY(吴海一); Zhan DM(詹冬梅); Sun FX(孙福新); Sun JZ(孙建璋); Wang GC(王广策)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2014-09-15
出版年	2014
卷号	v.32 期号:05 页码:46-53
文献类型	CNKI期刊论文
摘要	The aim of this study was to investigate the effects of light intensity and enhanced nitrogen supply on the growth and photosynthesis of the green-tide macroalga, Ulva prolifera. Thalli of U. prolifera were grown in natural or NH 4 +-enriched seawater under two different light intensities for 7 days, and then the growth rate, pigmentation, and photosynthetic performance of the thalli were evaluated. The results show that the relative growth rate(RGR) was markedly higher under the high light level than under the low light level. Enrichment with NH 4 + enhanced the RGR under high light intensity, but did not affect RGR under low light intensity. In low light conditions, NH 4 +-enrichment resulted in a marked decrease in the maximal photosynthetic rate( P m) and the maximum carbon fixation rate( V max), but it did not affect the half saturation constant for carbon( K 0.5) or the ratio of V max to K 0.5, which reflects the carbon acquisition efficiency. In high light conditions, P m, K 0.5, and the dark respiration rate( R d) increased under NH 4 + enrichment, but V max and the V max / K 0.5 ratio decreased. Regardless of the light intensity, NH 4 +-enrichment did not affect the apparent photosynthetic efficiency( α), which refl ects the ability of the alga to use light energy at low light levels. Under both low and high light intensities, the chlorophyll a(Chl a), chlorophyll b(Chl b), and carotenoids(Car) contents in thalli were higher in NH 4 +-enriched than in natural seawater, except that there was a decrease in the Chl b content of thalli in NH 4 +-enriched seawater under low light intensity. Therefore, NH 4 + enrichment improved the growth and photosynthetic performance of U. prolifera under high light intensity, but not under low light intensity. We discuss the possible mechanisms underlying these physiological responses.
关键词	Ulva prolifera low light ammonia enrichment growth rate photosynthesis pigment
CNKI专辑号	A;D;
CNKI专辑名称	基础科学;农业科技;
CNKI专题号	D052;
CNKI专题名称	水产和渔业;
分类号	S968.41
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	Supported by the National Natural Science Foundation of China(No.41376129) ; the Public Science and Technology Research Funds Projects of Ocean(Nos.201305005,201305021,201105008-2) ; the Natural Science Foundation of Jiangsu Province(No.BK2011400) ; the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA11020404-1)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/190313
专题	中国科学院海洋研究所
作者单位	1.InstituteofOceanology,ChineseAcademyofSciences 2.MarineBiologyInstituteofShandongProvince 3.MacroalgaeEngineeringTechnologyCentreofQingdao 4.YutianGroup
推荐引用方式 GB/T 7714	Xu ZG,Wu HY,Zhan DM,et al. Combined effects of light intensity and NH_4~+-enrichment on growth, pigmentation, and photosynthetic performance of Ulva prolifera(Chlorophyta). 2014.