化感物质对小麦幼苗吸收氮的影响

Effects of allelochemicals on nitrogen absorption of wheat seedling

摘要: 实验研究了3种不同浓度化感物质阿魏酸(FA)、苯甲醛(BH)、4-对叔丁基苯甲酸(4-BA)对小麦幼苗吸收NO₃-N和NH₄-N的影响结果表明，小麦幼苗对NO₃-N和NH₄-N吸收随化感物质浓度增大而逐渐降低。15d时在高浓度(0．5g／L)化感物质下小麦幼苗对NO₃-N吸收，FA、BH、4-BA处理分别为对照的58%、5O%、53％；对NH₄-N的吸收分别为对照的42%、19%、33%。对NH₄-N 吸收的抑制作用太于对NO₃-N吸收的抑制。化感物质对小麦幼苗吸收氮(N)的影响主要表现在小麦幼苗生长的前15d，30d时各浓度化感作用强度均大为减弱。

Abstract: Effects of three allelochenmicals such as ferulic acid(FA)，benzoldehyde(BH)and 4-tert-bytylbanzoie acid(4-BA)on nitrogen absorption of wheat seedling are studied．The results show that N absorption from both N0^-₃ and NH⁺₄ decrease with the increase of concentrationsof allelochemicals．Nitrogen absorption from N0^-3 and NH⁺₄ by fifteen-day-old seedlings，which are grown in three culture liquids such as FA，BH and 4-BA(0．5g／L)，is 58% and 42%，50％and 19% ，53% and 33% of that in the controls respectively．Therefore，the negative effects of allelochemicals on nitrogen absorption of NH⁺₄are stronger than those of NO^-₃．Those negative effects tend to be smaller as seedling grows bigger．