化感物质对小麦幼苗吸收氮的影响

Effects of allelochemicals on nitrogen absorption of wheat seedling.

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NO_-N和NH_4-N的影响。结果表明,小麦幼苗对NO_3-N和NH_4-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NO_3-N吸收,FA、BH、4-BA处理分别为对照的58％、50％、53％;对NH_4-N的吸收分别为对照的42％、19％、33％。对NH_4-N吸收的抑制作用大于对NO_3-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。

Effects of three allelochemicals such as ferulic acid(FA) ,benzoldehyde(BH) and 4-tert-bytylbanzoic acid(4-BA) on nitrogen absorption of wheat seedling are studied. The results show that N absorption from both NO3- and NH4+ decrease with the increase of concentrations of allelochemicals. Nitrogen absorption from NO3- and NH4+ 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 NH4+ are stronger than those of NO3- . Those negative effects tend to be smaller as seedling grows bigger.