受固氮活性制约的蓝藻固氮去铵阻抑及其与生理条件的关系
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* 国家自然科学基金


NH4+-DEKEPRESSION OF NITROGEN FIXATION IN BLUE-GREEN ALGAE Anabaena 7120 RESTRICTED BY NITROGEN-FIXING ACTIVITY AND ITS RELATION TO PHYSIOLOGICAL CONDITIONS
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    摘要:

    在不同气体环境中培养的蓝藻Anabaenu 7120固氮活性各异,Ar+CO2中最大,空气中次之,Ar中最小。固氮活性高者去铵阻抑速率大,反之则小。它们对各种生理条件的反应不一样,固氮活性高者,其去铵阻抑速率受氧和氮的抑制小。在氢和氧加合条件下,三种活性的蓝藻去铵阻抑均加快,但活性低者慢而小些。光强减弱或加光合抑制剂时,固氮活性低者去铵阻抑速率显着小于活性高者,而添加外源的蔗糖或丙酮酸时,也是固氮活性低者小些。

    Abstract:

    Under an atmosphere containing 97% Ar and 3% CO2 or containing 100% Ar, the nitrogenase activity of Anabaena 7120 was much higher or lower, respectively, than that in air. When the treatment was done in the above listed atmosphere considerable variation in the NH4+-derepression of nitrogen fixation in Anabaena occurred. Moreover, the response of NH4+-derepression of nitrogen fixation in Anobaena to physiological conditions differed. When algae was incubated in O2 or N2, Respectively, the extent of inhibition of NH4+-derepression in Anobaena with a lower nitrogen-fixing activity was greater than that in one with a higher activity. A great acceleration of NH4+-derepression of nitrogen fixation by hydrogen in Anabaena with a higher nitrogen-fixing activity was observed. The rate of NH4+-derepr;.ssion of nitrogen fixation in Anabaena with a higher nitrogen-fixing activity was significantly faster when the hydrogen was added with oxygen or added only with exogenous carbonhydrates, such as sucrose or pyruvate, to the test system. Under weak light or in the presence of phtosynthetic inhibitors in the reaction system, the NH4+-derepression of nitrogen fixation was more pronounced in Anabaena with a lower nitrogen-fixing activity.

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陈因,方大惟.受固氮活性制约的蓝藻固氮去铵阻抑及其与生理条件的关系[J].土壤学报,1994,31(4):422-429. Chen Yin, Fang Dawei. NH4+-DEKEPRESSION OF NITROGEN FIXATION IN BLUE-GREEN ALGAE Anabaena 7120 RESTRICTED BY NITROGEN-FIXING ACTIVITY AND ITS RELATION TO PHYSIOLOGICAL CONDITIONS[J]. Acta Pedologica Sinica,1994,31(4):422-429.

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  • 在线发布日期: 2013-02-25
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