Bergmark C L, Jackson W A, Volk R J, Blum U
Department of Soil Science, North Carolina State University, Raleigh, North Carolina 27695-7619.
Plant Physiol. 1992 Feb;98(2):639-45. doi: 10.1104/pp.98.2.639.
The influence of the allelopathic compound ferulic acid (FA) on nitrogen uptake from solutions containing both NO(3) (-) and NH(4) (+) was examined in 8-day-old nitrogen-depleted corn (Zea mays L.) seedlings. Concurrent effects on uptake of Cl(-) and K(+) also were assessed. The presence of 250 micromolar FA inhibited the initial (0-1 hours) rate of NO(3) (-) uptake and also prevented development of the NO(3) (-)-inducible accelerated rate. The pattern of recovery when FA was removed was interpreted as indicating a rapid relief of FA-restricted NO(3) (-) uptake activity, followed by a reinitiation of the induction of that activity. No inhibition of NO(3) (-) reduction was detected. Ammonium uptake was less sensitive than NO(3) (-) uptake to inhibition by FA. An inhibition of Cl(-) uptake occurred as induction of the NO(3) (-) transport system developed in the absence of FA. Alterations of Cl(-) uptake in the presence of FA were, therefore, a result of a beneficial effect, because NO(3) (-) uptake was restricted, and a direct inhibitory effect. The presence of FA increased the initial net K(+) loss from the roots during exposure to the low K, ammonium nitrate uptake solution and delayed the recovery to positive net uptake, but it did not alter the general pattern of the response. The implications of the observations are discussed for growth of plants under natural conditions and cultural practices that foster periodic accumulation of allelopathic substances.
在8日龄缺氮的玉米（Zea mays L.）幼苗中，研究了化感化合物阿魏酸（FA）对从同时含有NO(3) (-) 和NH(4) (+) 的溶液中吸收氮的影响。同时还评估了对Cl(-) 和K(+) 吸收的影响。250微摩尔FA的存在抑制了NO(3) (-) 吸收的初始（0 - 1小时）速率，并且还阻止了NO(3) (-) 诱导的加速吸收速率的发展。当去除FA时的恢复模式被解释为表明FA限制的NO(3) (-) 吸收活性迅速缓解，随后该活性诱导重新开始。未检测到对NO(3) (-) 还原的抑制作用。铵的吸收比NO(3) (-) 的吸收对FA抑制的敏感性更低。在没有FA的情况下，随着NO(3) (-) 转运系统的诱导发展，Cl(-) 的吸收受到抑制。因此，在FA存在下Cl(-) 吸收的改变是有益作用的结果，因为NO(3) (-) 的吸收受到限制，也是直接抑制作用的结果。在暴露于低钾硝酸铵吸收溶液期间，FA的存在增加了根系最初的净K(+) 损失，并延迟了恢复到正净吸收的时间，但它没有改变反应的总体模式。讨论了这些观察结果对自然条件下植物生长以及促进化感物质周期性积累的栽培实践的意义。
