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

doi:10.11707/j.1001-7488.20161004

Abstract

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 (F_o) of different Caragana species had an increase tendency under the repeated low temperature stress, but maximum fluorescence (F_m), maximum photochemical efficiency of PSⅡ (F_v/F_m), PSⅡ electron transfer rate (ETR) and PSⅡ photochemical fluorescence quenching coefficient (q_P) 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.

Key words: Caragana, chlorophyll fluorescence, repeat low temperature stress, response

CLC Number:

S718.43

Li Qingxue, Lan Lan, Jia Zhiqing, Liu Tao, Feng Lili, He Lingxianzi, Li Hong. Response of Chlorophyll Fluorescence Characteristics of Seedlings of Four Caragana Species to Repeated low Temperature Stresses[J]. Scientia Silvae Sinicae, 2016, 52(10): 31-37.

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Response of Chlorophyll Fluorescence Characteristics of Seedlings of Four Caragana Species to Repeated low Temperature Stresses

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