Effects of cinnamic acid and phthalic acid on photosynthetic characteristics of Pugionium Gaertn

Abstract [Objective] In order to explore the effects of phenolic acid self-toxic substances on the growth and photosynthetic characteristics of Pugionium cornutum (L.) Gaertn. and P .dolabratum Maxim., and to provide a theoretical basis for the protection, development, and utilization of wild resources of P . cornutum and P .dolabratum . [Methods] A pot experiment was conducted with P . cornutum and P .dolabratum seedlings. The experiment focused on two self-toxic substances, cinnamic acid and phthalic acid, and the seedlings were treated with varying concentrations of 0, 0.01, 0.1, 1, and 10 mmol/L. The aim was to observe the effects of these concentrations on seedling growth, chlorophyll content, chlorophyll fluorescence parameters, and gas exchange parameters. [Results] (1) Cinnamic acid and phthalic acid promoted seedling growth of P . cornatum at low concentrations and inhibited seedling growth at high concentrations. The growth of P . dolabratum was inhibited. 10 mmol/L cinnamic acid and phthalic acid t