两种化感物质对茄子幼苗光合作用及叶绿素荧光参数的影响

采用基质栽培,研究不同浓度的2,6-二叔丁基苯酚及邻苯二甲酸二甲酯对茄子幼苗光合作用及叶绿素荧光参数的影响.结果表明,两种化感物质使茄子叶片叶绿素含量、光合速率（P_n）、气孔导度（G_s）下降,细胞间隙CO₂浓度（C_i）先降低后升高;使茄子叶片的初始荧光(F_o)增加，PSⅡ最大光化学效率(F_v/F_m)、光系统Ⅱ光合电子传递量子效率(Ф_PSⅡ)、光化学猝灭系数(q_P)、天线转化效率(F_v^' /F_m^′)降低.2,6-二叔丁基苯酚使茄子叶片非光化学猝灭系数(q_N)先升高后降低,邻苯二甲酸二甲酯使q_N低于对照,对茄子叶片光合机构造成了伤害.

Effects of two kinds of allelochemicals on photosynthesis and chlorophyll fluorescence parameters of Solanum melongena L. seedlings

In a culture experiment, the effects of different concentration 2,6-bis (1, 1-dimethylethyl) phenol and 1,2-benzodicarboxylic dimethyl ester on the photosynthesis and chlorophyll fluorescence characteristics of eggplant seedlings were studied, and the results showed that these two allelochemicals were the barriers of chlorophyll content, net photosynthetic rate (Pn), and stomatal conductance (Gs). The intercellular CO2 concentration (Ci) decreased in the former period, and then increased. The allelochemicals increased initial fluorescence (Fo), but decreased maximum photochemical efficiency of PS II (Fv/Fm), quantum efficiency of non-cyclic electron transport of PS II (phi(PSII)), photochemical quenching ((qP) and antenna conversion efficiency (Fv'/Fm' ). 2,6-bis (1,1-dimethylethyl) phenol made non-photochemical quenching (qN) increase first and decrease then, while 1,2-benzodicarboxylic dimethyl ester decreased qN, which was harmful to the photosynthesis structure.