<i>cis</i>-Cinnamic Acid Selective Suppressors Distinct from Auxin Inhibitors
作者:Katsuhiro Okuda、Keisuke Nishikawa、Hiroshi Fukuda、Yoshiharu Fujii、Mitsuru Shindo
DOI:10.1248/cpb.c14-00169
日期:——
The activity of cis-cinnamic acid (cis-CA), one of the allelochemicals, in plants is very similar to that of indole-3-acetic acid (IAA), a natural auxin, and thus cis-CA has long been believed to be an analog of auxin. We have reported some structure–activity relationships studies by synthesizing over 250 cis-CA derivatives and estimating their inhibitory activities on root growth inhibition in lettuce. In this study, the compounds that showed low- or no-activity on root growth inhibition were recruited as candidates suppressors against cis-CA and/or auxin and tested for their activity. In the presence of cis-CA, lettuce root growth was inhibited; however, the addition of some cis-CA derivatives restored control-level root growth. Four compounds, (Z)-3-(4-isopropylphenyl)acrylic acid, (Z)-3-(3-butoxyphenyl)acrylic acid, (Z)-3-[3-(pentyloxy)phenyl]acrylic acid, and (Z)-3-(naphthalen-1-yl)acrylic acid were selected as candidates for a cis-CA selective suppressor they allowed the recovery of root growth from inhibition by cis-CA treatment without any effects on the IAA-induced effect or elongating activity by themselves. Three candidates significantly ameliorated the root shortening by the potent inhibitor derived from cis-CA. In brief, we have found some cis-CA selective suppressors which have never been reported from inactive cis-CA derivatives for root growth inhibition. cis-CA selective suppressors will play an important role in elucidating the mechanism of plant growth regulation.
等位化学物质之一的顺式肉桂酸(cis-CA)在植物体内的活性与天然辅助素吲哚-3-乙酸(IAA)非常相似,因此顺式肉桂酸一直被认为是辅助素的类似物。我们合成了 250 多种顺式-CA 衍生物,并估算了它们对莴苣根系生长的抑制活性,从而报告了一些结构-活性关系研究。在本研究中,我们将对根系生长抑制活性低或无活性的化合物作为顺式 CA 和/或辅助素的候选抑制剂,并对其活性进行了测试。在存在顺式-CA 的情况下,莴苣根系生长受到抑制;然而,添加一些顺式-CA 衍生物后,根系生长恢复到控制水平。(Z)-3-(4-异丙基苯基)丙烯酸、(Z)-3-(3-丁氧基苯基)丙烯酸、(Z)-3-[3-(戊氧基)苯基]丙烯酸和(Z)-3-(萘-1-基)丙烯酸这四种化合物被选为顺式-CA 选择性抑制剂的候选化合物。三种候选物质能明显改善顺式-CA 衍生的强效抑制剂对根缩短的影响。总之,我们从无活性的顺式 CA 衍生物中发现了一些从未报道过的抑制根生长的顺式 CA 选择性抑制剂。