苯丙烯酸对黄瓜幼苗生理特性的影响

采用基质栽培模拟实验，研究了不同浓度苯丙烯酸对黄瓜幼苗生理特性的影响.结果表明，苯丙烯酸对黄瓜幼苗的光合色素、光合速率、蒸腾速率和根系活力产生了抑制作用.当处理浓度为25 μmol·L^-1时，对类胡萝卜素产生抑制作用,对叶绿素a、叶绿素b为促进作用；当浓度为50 μmol·L^-1时，对光合速率、蒸腾速率和根系活力均产生显著的抑制作用（P＜0.05)，并随着处理浓度的增加抑制作用增强；当浓度为150 μmol·L^-1时，对叶绿素a、叶绿素b产生显著抑制作用（P＜0.05)；随着处理浓度的增加，对黄瓜上述生理特性的抑制作用增强.低浓度苯丙烯酸（25～50 μmol·L^-1）对幼苗根系活力的抑制强度不大，可在处理后期得到恢复；高浓度（100～150 μmol·L^-1）处理则表现出显著的抑制作用，随着处理时间延长，抑制作用增强（P＜0.05).

Effects of cinnamic acid on physiological characteristics of Cucumis sativus seedling

With substrate culture, this paper studied the effects of different concentrations of cinnamic acid on the physiological characteristics of Cucumis sativus seedling. The results showed that 25 micromol.L(-1) of cinnamic acid had an inhibition effect on carotenoids, but a promotion effect on chlorophyll a and b. 50 micromol.L(-1) of this compound could significantly inhibit the photosynthetic rate, transpiration rate and root activity (P < 0.05), and this effect was getting stronger when the concentration was higher. 150 micromol cinnamic acid.L(-1) had a significant inhibition effect on chlorophyll a and b (P < 0.05). Cinnamic acid had a weak inhibition effect on root activity when its concentration was low (25-50 micromol.L(-1)), but the effect was significant when the concentration was high (100-150 micromol.L(-1)), which became stronger with the longer handling time (P < 0.05).