Abstract:
:Using the ammonium analogue (14)CH3NH 3 (+) , ammonium transport was studied in the cyanobiont cells freshly isolated from the root nodules of Cycas revoluta. An L-methionine-DL-sulphoximine (MSX)-insensitive ammonium-transport system, which was dependent on membrane potential (ΔΨ), was found in the cyanobiont. However, the cyanobiont was incapable of metabolizing exogenous (14)CH3NH 3 (+) or NH 4 (+) because of the absence of another ammonium-transport system responsible for the uptake of ammonium for assimilation via glutamine synthetase (EC 6.3.1.2). Such a modification seems to be the result of symbiosis because the free-living cultured isolate, Anabaena cycadeae, has been shown to possess both the ammonium-transport systems.
journal_name
Plantajournal_title
Plantaauthors
Rai AN,Lindblad P,Bergman Bdoi
10.1007/BF00392134subject
Has Abstractpub_date
1986-11-01 00:00:00pages
379-81issue
3eissn
0032-0935issn
1432-2048journal_volume
169pub_type
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