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在研究红萍固氮时,曾发现培养液里含有氮素,因此推测红萍可能排氮。P~etersC将此作为理论性问题提出来,他用卡洲满江红(Azolla caroliniana)离体藻研究时发现,该藻可把它固定氮的50%以铵的形式释放出来,而正常的萍、藻共生体却未发现排氮。Brill曾提及野生型墨西哥满江红(Azolla mexicana)可将其固氮量的20%左右以铵态排出,但尚未见详细实验报道。 为了进一步弄清这问题,我们采用~(15)N示踪技术,初步探讨了红萍排氮过程及水稻对它的利用情况。
In the study of Azolla nitrogen fixation, it was found that the culture fluid contains nitrogen, so speculated that Rhodiola may nitrogen. P ~ etersC put forward this as a theoretical issue, he used Azolla caroliniana isolated algae study found that the algae can be 50% of its fixed nitrogen released in the form of ammonium, while the normal Ping, Algal symbionts did not find nitrogen row. Brill mentioned that wild-type Azolla mexicana can discharge about 20% of its nitrogen-fixing capacity in ammonium form, but no detailed experiments have been reported yet. In order to further clarify this problem, we used ~ (15) N tracing technique to investigate the nitrogen-fixing process of Rhodiola rosea and its utilization by rice.