PROBLEM TO BE SOLVED: To provide a gravitropism regulator containing a cis-cinnamic acid or a cinnamic acid analog.SOLUTION: A gravitropism regulator contains a cis-cinnamic acid and/or a cinnamic acid analog as an active ingredient. An example of the cinnamic acid analog is a compound obtained by the following reaction formula (where R is a phenyl group).SELECTED DRAWING: Figure 6COPYRIGHT: (C)2020,JPO&INPIT【課題】シス桂皮酸又は桂皮酸類縁体を含む重力屈性調節剤の提供。【解決手段】シス桂皮酸及び/又は桂皮酸類縁体を有効成分として含む重力屈性調節剤であり、桂皮酸類縁体は、例えば下記の反応式によって得られる化合物が挙げられる。（上式中、Ｒはフェニル基を示す。）【選択図】図６
