摘要
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。
The maize seedlings effects of different concentrations of DCPTA on chlorophyll content and fluorescence parameters of （zhengdan 958 ）was studied under low temperature stress in greenhouse conditions. The setups of low temperature（day/night） were 18℃/9℃ ,16℃/7℃ and 14℃/5℃ respectively. The results showed that the chlorophyll content of maize seedlings was significantly higher than the control（ distilled water）after the DCPTA treatment under low temperature stress, which increased by 23.62% - 144.55 %. The characteristic of Fo was lower than the contrast after the DCPTA treatment,which was reduced by 4.55% -39.53%. The characteristic of Fv/Fm （ maximum photochemical efficiency of PS 11 ）, the characteristic of FiFo （ the potential activity of PS Ⅱ ） and qs （non-photochemical quenching coefficient） were higher than the control, which were increased by 30.26% - 112.39% ,7.47% - 32.96% and 5.98% - 57.52% respectively. The concentration of 50mg/L DCPTA showed a good protection for the photosynthetic system under the low temperature stress, resulting in the increase of anti-low temperature ability in maize seedling leaves.
出处
《作物杂志》
CAS
CSCD
北大核心
2012年第5期63-67,共5页
Crops
基金
"十二五"国家科技支撑计划项目"东北玉米低温生理胁迫指标与诊断方法研究"(2011BAD32B03-02)
关键词
低温胁迫
DCPTA
玉米
叶绿素含量
叶绿素荧光
Low temperature stress
DCPTA
Maize
Chlorophyll content
Chlorophyll fluorescence
