摘要
为了探讨长时间沙尘胁迫下欧洲李叶片光合性能的变化机制,从而为欧洲李的栽培管理提供理论依据,以5年生的欧洲李为研究对象,对欧洲李叶片分别进行轻度(5 mg·cm-2)和重度(12 mg·cm-2)的人工覆沙胁迫处理,以无沙尘胁迫的叶片为对照,分别在沙尘胁迫后的第10、20、30和40天测定其光合参数和叶绿素荧光参数。结果表明:两种覆沙胁迫下,随着覆沙处理时间的延长,欧洲李叶片的总叶绿素及叶绿素a、叶绿素b含量均呈降低趋势;欧洲李叶片的净光合速率和蒸腾速率均随处理时间的延长而降低,其气孔导度和胞间CO2浓度均呈现出先升高后降低的变化趋势,说明沙尘胁迫处理前期非气孔因素是欧洲李光合作用的主要限制因素,处理后期气孔因素为主要限制因素;沙尘胁迫导致PSII最大光化学效率呈下降趋势,对欧洲李产生光抑制作用,但在沙尘胁迫处理后期能够通过提高非光化学淬灭系数来增加热耗散,消耗过剩光能,从而保护光合机制。
In order to investigate change mechanism of photosynthetic characteristics in Prunus domestica under longtermdust stress,and to provide a theoretical basis for cultivation and management in P.domestica,five-year-old plantswere used as research objects,leaves were treated under mild(5mg·cm^-2)and severe(12mg·cm^-2)artificial sandtreatments,untreated leaves were used as CK,and photosynthetic and fluorescence parameters were determined on the10th,20th,30th and40th day after dust stress.The results showed that contents of total chlorophyll,chlorophyll a andchlorophyll b were decreased with prolongation of sand-covering time under the two dust stress.Net photosyntheticrate and transpiration rate in P.domestica leaves were decreased with prolongation of treatment time,and stomatalconductance and intercellular CO2concentration had a trend of increasing firstly and then decreasing.So non-stomatalfactors in the early stage were the main limiting factors of photosynthesis in P.domestica,and stomatal factors werethe main limiting factors.Dust stress made the maximum photochemical efficiency of PSII reduce,which causedphotoinhibition in P.domestica,but increased non-photochemical quenching coefficient increase heat dissipation,consume excess light energy and protect the photosynthetic mechanism at the later stage of dust stress.
作者
薛亚荣
巴特尔.巴克
XUE Yarong;Batur·Bake(College of Grassland and Environment Science, Xinjiang Agricultural University, Urumqi 830052, Xinjiang, China)
出处
《经济林研究》
北大核心
2018年第4期123-129,共7页
Non-wood Forest Research
基金
国家自然科学基金项目"新疆几种特色果树叶绿素荧光对沙尘胁迫的响应"(31460316)
关键词
欧洲李
沙尘胁迫
叶绿素
光合特性
叶绿素荧光
Prunus domestica
dust stress
chlorophyll
photosynthetic characteristics
chlorophyll fluorescence
