THE ASSIMILATION OF NITROGEN FROM AMMONIUM SALTS AND NITRATE BY FUNGI
THE ASSIMILATION OF NITROGEN FROM AMMONIUM SALTS AND NITRATE BY FUNGI
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DOI：
10.1093/jxb/5.2.232
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发表时间：
1954-01-01
影响因子：
6.9
通讯作者：
MACMILLAN, A
中科院分区：
文献类型：
--
作者：
MORTON, AG;MACMILLAN, A
研究了几种外界因素对短帚霉同化氨、硝酸盐和亚硝酸盐速率的影响。在许多条件下，氨的同化比硝酸盐快。氨，即使在非常低的浓度，完全抑制硝酸盐同化时，这两种氮源一起存在。然而，亚硝酸盐与氨同时被同化。因此，可以得出结论，氨阻止了真菌将硝酸盐还原为亚硝酸盐。在氨的存在下，硝酸盐同化的抑制对于除S之外的许多霉菌是共同的。短茎并且被认为在自然栖息地中具有适应性意义。硝酸盐还原体系在S.短枝藻在完全不存在硝酸盐的氨上生长。当氨的抑制作用被消除时，它迅速起作用。类似地，硝酸盐生长的菌丝体能够以最大速率同化氨而没有任何适应性滞后。
The influence of several external factors on the rate of assimilation of ammonia, nitrate and nitrite has been studied in Scopulariopsis brevicaulis. Ammonia is assimilated more rapidly than nitrate over a wide range of conditions. Ammonia, even in very low concentration, completely suppresses nitrate assimilation when both sources of nitrogen are present together. Nitrite, however, is assimilated simultaneously with ammonia. It is therefore concluded that ammonia blocks the reduction of nitrate to nitrite by the fungus. The suppression of nitrate assimilation in the presence of ammonia is common to many mould fungi besides S. brevicaulis. and is believed to have adaptive significance in natural habitats. The nitrate-reducing system is formed even when S. brevicaulis is grown on ammonia in complete absence of nitrate. It comes into action rapidly when the inhibiting effect of ammonia is removed. Similarly, nitrate-grown mycelium is capable of assimilating ammonia at maximal rate without any adaptive lag.