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当前位置: 首页 > 文章 > 光照和不同形态氮营养盐供应对坛紫菜硝酸还原酶活性的影响 水产学报 2007,31 (1) 92-98
Position: Home > Articles > Effect of light and different forms of nitrogen on the activity of nitrate reductase of Porphyra haitanensis (Rhodophyta) Journal of Fisheries of China 2007,31 (1) 92-98

光照和不同形态氮营养盐供应对坛紫菜硝酸还原酶活性的影响

作  者：
徐智广;邹定辉;张鑫;刘树霞;高坤山
单  位：
汕头大学海洋生物研究所
关键词：
坛紫菜;硝酸还原酶活性;氮饥饿;氮加富;光照;营养盐
摘  要：
为了探讨光照、NO3--N和NH4+-N对坛紫菜(Porphyra haitanensis)硝酸还原酶活性(NRA)的影响,在光照和黑暗条件下分别对坛紫菜叶状体进行氮(N)饥饿→氮(N)加富和N加富→N饥饿处理,并测定NRA的变化。结果表明:在N饥饿→N加富过程中,光照下NRA比黑暗中要高;NO3--N的加富能提高NRA,且在光照下比黑暗中NRA达到最大值的时间要短;而NH4+-N与NO3--N共同对N饥饿藻体加富时NRA没有明显变化,并与NH4+-N单独加富无显著差异。另外,对于N加富→N饥饿的处理,在光照下NO3--N加富和NH4+-N与NO3--N共同加富的NR都能在N饥饿处理后的一段时间内维持较高的活性。这些结果说明:光照和硝酸盐对NRA起正调节作用,而铵盐对NRA起负调节作用,但NRA与体外硝酸盐浓度并不成直接的正相关关系。
译  名：
Effect of light and different forms of nitrogen on the activity of nitrate reductase of Porphyra haitanensis (Rhodophyta)
作  者：
XU Zhi-guang~1,ZOU Ding-hui~1,ZHANG Xin~1,LIU Shu-xia~1,GAO Kun-shan~(1,2)(1.Marine Biology Institute,Shantou University,Shantou 515063,China;2.Institute of Hydrobiology,Chinese Academy of Science,Wuhan 430072,China)
关键词：
Porphyra haitanensis;activity of nitrate reductase;N-starvation;N-enrichment;light;nutrient
摘  要：
To investigate the effects of light,nitrate(NO_3~——N) and ammonium(NH_4~+-N) on the activity of nitrate reductase(NRA) in the red alga Porphyra haitanensis,thalli were incubated in seawater with different N supply(N-enrichment and N-starvation) in the light or in darkness.The results showed that NRA was higher in the light than in darkness;NRA increased when thalli were incubated in NO_3~——N,and it enhanced faster in the light than in darkness.There was no significant difference of NRA between thalli incubated in seawater enriched by NO_3~——N and NH_4~+-N simultaneously and those enriched by NH_4~+-N solely.Additionally,NR in light could maintain relative high activity for several hours when thalli were transferred from N-enrichment to N-starvation.It was concluded that light and / or NO_3~——N increased NRA of Porphyra haitanensis,but NH_4~+-N restrained it.However,NRA was not in direct proportion to the concentration of NO_3~——N in culture.

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