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以郑单958为盆栽试验材料,设置3个昼夜温度梯度(18℃/9℃、16℃/7℃、14℃/5℃),研究喷施不同浓度DCPTA对玉米幼苗叶片的叶绿素含量以及叶绿素荧光特性的调控机制。结果表明,低温胁迫下喷施DCPTA玉米幼苗的叶绿素含量比对照(清水处理)高23.62%～144.55%;玉米叶片Fo(初始荧光)比对照低4.55%～39.53%,Fv/Fo(PSⅡ潜在活性)、Fv/Fm(PSⅡ最大光化学效率)、qN(非光化学猝灭系数)分别比对照高出30.26%～112.39%、7.47%～32.96%、5.98%～57.52%;浓度为50mg/L的DCPTA喷施玉米幼苗叶片后,对低温胁迫下玉米叶片光合系统的保护效果最好,这有利于提高玉米幼苗叶片的抗冷性。
In this study, three day-night temperature gradients (18 ℃ / 9 ℃, 16 ℃ / 7 ℃, 14 ℃ / 5 ℃) were set up in pot experiment with Zhengdan 958 to study the effects of different concentrations of DCPTA on chlorophyll content, Fluorescence characteristics of the regulatory mechanism. The results showed that the chlorophyll content of DCPTA maize seedlings sprayed 23.62% -144.55% higher than that of the control (fresh water treatment) under low temperature stress, Fo (initial fluorescence) was 4.55% -39.53% lower than that of the control, and the Fv / Fo ), Fv / Fm (maximum photochemical efficiency of PSⅡ) and qN (non-photochemical quenching coefficient) were respectively 30.26% ~ 112.39%, 7.47% ~ 32.96% and 5.98% ~ 57.52% After spraying corn seedling leaves, the photosynthetic system of maize leaves under low temperature stress had the best protective effect on the photosynthetic system, which was beneficial to improve the chilling resistance of maize seedling leaves.