Abstract:
:The inhibitory effect of NH4+ on net NO3- uptake has been attributed to an enhancement of efflux and, recently, to an inhibition of influx. To study this controversy, we devised treatments to distinguish the effects of NH4+ on these two processes. Roots of intact barley (Hordeum vulgare L.) seedlings, uninduced or induced with NO3- or NO2-, were used. Net uptake and efflux, respectively, were determined by following the depletion and accumulation in the external solutions. In roots of both uninduced and NO2- -induced seedlings, NO3- efflux was negligible; hence, the initial uptake rates were equivalent to influx. Under these conditions, NH4+ had little effect on NO3- uptake (influx) rates by either the low- or high-Km uptake systems. In contrast, in plants preloaded with NO3-, NH4+ and its analog CH3NH3+ decreased net uptake, presumably by enhancing NO3- efflux. The stimulatory effect of NH4+ on NO3- efflux was a function of external NH4+ and internal NO3- concentration. These results were corroborated by the absence of any effect of NH4+ on NO2- uptake unless the roots were preloaded with NO2-. In this case NH4+ increased efflux and decreased net uptake. Hence, the main effect of NH4+ on net NO3- and NO2- uptake appears to be due to enhancement of efflux and not to inhibition of influx.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Aslam M,Travis RL,Huffaker RCdoi
10.1104/pp.106.4.1293subject
Has Abstractpub_date
1994-12-01 00:00:00pages
1293-1301issue
4eissn
0032-0889issn
1532-2548pii
106/4/1293journal_volume
106pub_type
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