林业科学2016，Vol.52Issue(10)：31-37,7.DOI:10.11707/j.1001-7488.20161004
4种锦鸡儿属植物幼苗叶绿素荧光参数对重复低温胁迫的响应
Response of Chlorophyll Fluorescence Characteristics of Seedlings of Four Caragana Species to Repeated low Temperature Stresses
摘要
Abstract
Objective]Caragana genus,a group of shrubs,are used in vegetation restoration and reconstruction in sandy area due to its characteristics of strong tolerance to drought and barren soil. In this study, a repeated low temperature stress experiment was conducted to study the effects of repeated low temperature stresses on chlorophyll fluorescence of four different Caragana species and to analyze the response of the seedlings to the repeated low temperature. [Method]Chlorophyll fluorescence parameters of Caragana. species were measured under room temperature ( daytime:30 ℃,night:20 ℃) ,the first low temperature stress (0 ℃ for 12 h) and the second low temperature stress ( 0 ℃ for 24 hours) . The influence of the repeated low temperature stress on the chlorophyll fluorescence parameters were analyzed in four different Caragana species. [Result]Initial fluorescence ( Fo ) of different Caragana species had an increase tendency under the repeated low temperature stress,but maximum fluorescence ( Fm ) ,maximum photochemical efficiency of PSⅡ (Fv/Fm),PSⅡ electron transfer rate (ETR) and PSⅡ photochemical fluorescence quenching coefficient ( qP ) showed a decreasing tendency. After repeated low temperature stress,initial fluorescence of C. tibetica increased significantly ( P >0 . 05 ) ,and maximum fluorescence and maximum photochemical efficiency of PSⅡ of four different Caragana species decreased significantly (P<0. 05). The PSⅡ electron transfer rate of C. microphylla and C. tibetica was decreased significantly (P<0. 05). The PSⅡ photochemical fluorescence quenching coefficient of C. korshinskii,C. tibetica and C. microphylla was decreased significantly ( P < 0. 05 ). The PSⅡ non - photochemical fluorescence quenching coefficient (NPQ) of C. korshinskii was increased significantly (P<0. 05),but C. microphylla was decreased significantly ( P <0 . 05 ) . [Conclusion]The result indicated that the repeated low temperature stress influenced the photosynthetic apparatus of different Caragana species, and photosynthetic capacity of different Caragana species decreased under the repeated low temperature stress. C. intermedia,C. korshinskii and C. tibetica showed an ability of consuming the surplus excitation energy to protect photosynthetic apparatus under the repeated low temperature stress. All the analysis shows that C. intermedia and C. korshinskii have a strong adaptability to the repeated low temperature stress than C. microphylla and C. tibetica.关键词
锦鸡儿/叶绿素荧光/重复低温胁迫/响应Key words
Caragana/chlorophyll fluorescence/repeat low temperature stress/response分类
农业科技引用本文复制引用
李清雪,兰岚,贾志清,刘涛,冯莉莉,何凌仙子,李虹..4种锦鸡儿属植物幼苗叶绿素荧光参数对重复低温胁迫的响应[J].林业科学,2016,52(10):31-37,7.基金项目
“十二五”国家科技支撑计划项目(2012BAD16B0102)“优良固沙植物材料筛选及其配套技术研究”和林业公益性行业科研专项经费项目(201504420)“青海共和盆地典型固沙植物根系特征及功能研究”。 （2012BAD16B0102）
