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当前位置: 首页 > 文章 > 粪产碱菌(Alcaligenes faecalis)的反硝化及固氮作用 核农学报 1987,1 (3) 3-10
Position: Home > Articles > DENITRIFICATION AND NITROGEN FIXATIONBY Altaligenes faecalis Journal of Nuclear Agricultural Sciences 1987,1 (3) 3-10

粪产碱菌(Alcaligenes faecalis)的反硝化及固氮作用

作  者：
林敏;尤崇杓
单  位：
中国农业科学院原子能利用研究所
关键词：
粪产碱菌;反硝化作用;固氮活性
摘  要：
粪产碱菌生长在NH_4~+和NO_3~-两种氮源的介质中时,优先利用NH_4~+,在好气条件下,NH_4~+的存在抑制了粪产碱菌对NO_3~-的同化作用。在厌氧条件下,粪产碱菌能以乳酸为碳源,NH_4~+为唯一氮源进行反硝化作用,NO_3~-作为最终电子受体,接受无氧呼吸链传递的末端电子,经NO_2~-等氮氧化物最终还原为N_2。在好气和厌气条件下,低浓度的NO_2~-对粪产碱菌生长有一定抑制作用,但NH_4~-的存在并不抑制细菌对NO_2~-的利用。粪产碱菌在厌氧条件下还具有需硝酸盐的固氮酶活性。当氧存在或以NO_2~-代替NO_3~-时,固氮活性均受抑制,硝酸盐或亚硝酸盐浓度愈高,抑制愈强。反硝化作用产生的N_2能为微好氧条件下生长的粪产碱菌所重新固定。
译  名：
DENITRIFICATION AND NITROGEN FIXATIONBY Altaligenes faecalis
作  者：
Liu Min You Chongbiao (Institute for APPlic tion of Atomic Energy, Chinese Academy of Agricultural Sciences, Beijing)
关键词：
Alcaligcncs faecals denitrification nitrogenase activity
摘  要：
Alcaligenes faecalis predominantly utilizes NH4+-N as nitrogen source, when it grows in the culture medium contained both N HI and NO3-Ammonia inhibits the assimilation of nitrate by bacterium under aerobic condition.Nitrate serves as a terminal election acceptor in Alcaligenes faecalis,when it grows anaerobically with lactate and ammonia as the carbon and nitrogen sources,respectively.Under anaerobic condition nitrate accepts the terminal electron transfered from respiratory chain,and then reduces N2 via nitrite in the bacterium.Nitrite inhibits the growth rate of the bacterium even in low concentrations.The utilization of nitrite is not restricted by ammonia in the bacterium under both aerobic and anaerobic conditions.Nitrate-dependent nitrogenase activity has been shown in A.faecalis under severe oxygen-limited condition,but nitrite inhibits nitrogenase activity even in low concentrations under the same condition.In the presence of O2(air).nitrogenase activity dramatically decreased with increasing concentration of nitrate in the bacterium.A.faecalis could fix 15N2 which was converted from 15NO3-by denitrification.

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