FEEDBACK-REGULATION OF NITRATE INFLUX IN BARLEY ROOTS BY NITRATE, NITRITE, AND AMMONIUM

被引:137
作者
KING, BJ
SIDDIQI, MY
RUTH, TJ
WARNER, RL
GLASS, ADM
机构
[1] UNIV BRITISH COLUMBIA, TRI UNIV MESON FACIL, VANCOUVER V6T 2A3, BC, CANADA
[2] WASHINGTON STATE UNIV, DEPT CROPS & SOILS, PULLMAN, WA 99164 USA
关键词
D O I
10.1104/pp.102.4.1279
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The short-lived radiotracer N-13 was used to study feedback regulation of nitrate influx through the inducible high-affinity transport system of barley (Hordeum vulgare L. cv Steptoe) roots. Both wild-type plants and the mutant line Az12:Az70 (genotype nar1a;nar7w), which is deficient in the NADH-specific and NAD(P)H-bispecific nitrate reductases (R.L. Warner, R.C. Huffaker [1989] Plant Physiol 91: 947-953) showed strong feedback inhibition of nitrate influx within approximately 5 d of exposure to 100 muM nitrate. The result with the mutant, in which the flux of nitrogen into reduced products is greatly reduced, indicated that nitrate itself was capable of exercising feedback regulation upon its own influx. This conclusion was supported by the observation that feedback in wild-type plants occurred in both the presence and absence Of L-methionine sulfoximine, an inhibitor of ammonium assimilation. Nitrite and ammonium were also found to be capable of exerting feedback inhibition upon nitrate influx, although it was not determined whether these ions themselves or subsequent metabolites were responsible for the effect. It is suggested that feedback regulation of nitrate influx is potentially mediated through several nitrogen pools, including that of nitrate itself.
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页码:1279 / 1286
页数:8
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