EFFECTS OF NITROGEN LIMITATION ON UPTAKE OF INORGANIC CARBON AND SPECIFIC ACTIVITY OF RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE OXYGENASE IN GREEN MICROALGAE

被引:48
作者
BEARDALL, J [1 ]
ROBERTS, S [1 ]
MILLHOUSE, J [1 ]
机构
[1] LA TROBE UNIV,DEPT BOT,BUNDOORA,VIC 3043,AUSTRALIA
来源
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE | 1991年 / 69卷 / 05期
关键词
MICROALGAE; CO2; ASSIMILATION; NITROGEN LIMITATION; RUBISCO; CHLORELLA;
D O I
10.1139/b91-147
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The effects of nitrogen limitation on the characteristics of inorganic carbon-dependent O2 evolution have been examined in the green microalgae Chlorella emersonii and Gloeomonas sp. When cells were grown under 5% CO2 or air, decreasing the growth rate (increasing nitrogen limitation) caused a decrease in maximum rates of photosynthetic O2 evolution, although when expressed on a per cell basis such changes were only evident at growth rates below 0.16 day-1. Severe nitrogen limitation also caused a marked decrease in k1/2 (CO2) in light- and CO2-dependent O2 evolution. Although values for this parameter were not as low as for low CO2 grown cells with a fully induced CO2-concentrating mechanism, they were less than one-half the corresponding values from cells with the mechanism fully repressed. Nitrogen-limitation also resulted in decreases in the activity and cellular content of ribulose-1,5-bisphosphate carboxylase/oxygenase. The changes to activity and levels of this enzyme were not equivalent so the specific activity decreased dramatically between growth rates of 0.57 and 0.25 day-1. Similar effects were noted in Gloeomonas and in air-grown Chlorella. The results are discussed in relation to regulation of CO2 uptake and assimilation in microalgae.
引用
收藏
页码:1146 / 1150
页数:5
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