Deposition of ammonium and nitrate in the roots of maize seedlings supplied with different nitrogen salts

被引:30
作者
Bloom, Arnold J. [1 ]
Randall, Lesley [1 ]
Taylor, Alison R. [2 ]
Silk, Wendy K. [3 ]
机构
[1] Univ Calif Davis, Dept Plant Sci, Davis, CA 95616 USA
[2] Univ N Carolina, Dept Biol & Marine Biol, Wilmington, NC 28403 USA
[3] Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA
基金
美国国家科学基金会;
关键词
ammonium; nitrate; osmolarity; root apex; tissue storage; xylem sap; SELECTIVE MICROELECTRODES; INORGANIC NITROGEN; GROWTH ZONE; NET FLUXES; ION UPTAKE; ASSIMILATION; POTASSIUM; ACCUMULATION; ABSORPTION; PATTERNS;
D O I
10.1093/jxb/err410
中图分类号
Q94 [植物学];
学科分类号
071001 [植物学];
摘要
This study measured total osmolarity and concentrations of NH4+, NO3-, K+, soluble carbohydrates, and organic acids in maize seminal roots as a function of distance from the apex, and NH4+ and NO3- in xylem sap for plants receiving NH4+ or NO3- as a sole N-source, NH4+ plus NO3-, or no nitrogen at all. The disparity between net deposition rates and net exogenous influx of NH4+ indicated that growing cells imported NH4+ from more mature tissue, whereas more mature root tissues assimilated or translocated a portion of the NH4+ absorbed. Net root NO3- influx under Ca(NO3)(2) nutrition was adequate to account for pools found in the growth zone and provided twice as much as was deposited locally throughout the non-growing tissue. In contrast, net root NO3- influx under NH4NO3 was less than the local deposition rate in the growth zone, indicating that additional NO3- was imported or metabolically produced. The profile of NO3- deposition rate in the growth zone, however, was similar for the plants receiving Ca(NO3)(2) or NH4NO3. These results suggest that NO3- may serve a major role as an osmoticant for supporting root elongation in the basal part of the growth zone and maintaining root function in the young mature tissues.
引用
收藏
页码:1997 / 2006
页数:10
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