著者

Uheda Eiji

出版者

一般社団法人日本植物生理学会

雑誌

Plant and cell physiology (ISSN:00320781)

巻号頁・発行日

vol.27, no.7, pp.1255-1261, 1986-10

被引用文献数

1

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A procedure has been developed to isolate hair cells from Anabaena containing packets of the aquatic fern Azolla. Unbroken algal packets, isolated by enzyme treatment and flotation on 12.5% Percoll solution, contained hair cells, Anabaena filaments and the envelope membrane. When the packet suspension was gently pipetted, hair cells attached to the envelope membrane became detached from the Anabaena filaments. Hair cells were separated by flotation on 34% Percoll solution and further purified by sifting through nylon mesh. Both branched and unbranched cells were isolated and about 70% remained unstained by 0.1% trypan blue. Electron microscopic observation showed that these cells were protoplasts enclosed by a thin envelope and had well preserved internal structures. The activities of ammonia-assimilating enzymes in the hair cells were much higher than those in Azolla leaves, while the activities in the endophytes were repressed to very low levels. These results suggest that hair cells play an important role in the assimilation of the nitrogen which the endophytes fix and release into the cavity.