| 陈梅,唐运来.高温胁迫下银杏离体枝条叶片的叶绿素荧光特性[J].中国南方果树,2013,42(2): |
| 高温胁迫下银杏离体枝条叶片的叶绿素荧光特性 |
| Chlorophyll Fluorescence Characteristics in Leaves on Detached Branches of Ginkgo Subjected to High Temperature Stress |
| 投稿时间：2012-12-25 修订日期：2013-02-01 |
| DOI： |
| 中文关键词: 高温胁迫 银杏 光合作用 叶绿素荧光 |
| 英文关键词:High temperature stress ginkgo photosynthesis chlorophyll fluorescence |
| 基金项目: |
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| 摘要点击次数: 2408 |
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| 中文摘要: |
| 银杏是一种重要经济树种，随着全球气温升高，高温适应性问题已经影响了其在低纬度区域的栽培。为了探明高温胁迫对银杏叶片光合过程的影响，本研究中离体银杏枝条被置于不同温度（25 ℃、30 ℃、35 ℃、40 ℃、45 ℃）下处理，随即对其叶绿素荧光参数进行监测。 结果显示：40 ℃以上高温胁迫下，银杏叶片的光系统II（PSⅡ）潜在光化学效率（Fv/Fo）、最大光化学效率（Fv/Fm）显著下降；最大荧光（Fm）、最大相对电子传递速率（rETRmax）、PSⅡ实际光化学效率（Yield）、光化学淬灭系数（qP）均显著下降；而初始荧光（Fo）和非光化学淬灭系数（NPQ）在40℃以上高温胁迫下显著上升。本研究表明，银杏离体枝条叶片光合作用对温度变化较敏感，推测高温可能伤害了光合机构，从而对光能的吸收、转换与光合电子传递都有显著的影响。银杏离体枝条叶片的叶绿素荧光动力学参数对高温的敏感性，可能有助于快速筛选和培育耐高温的银杏品种。 |
| 英文摘要: |
| Ginkgo is an important economic tree species with a variety of uses. With global warming the cultivation of ginkgo has been affected by high temperature adaptability in low latitudes. In plants, photosynthesis is considered to be very sensitive to high temperature stress. In this study, to investigate the effects of high temperature stress on the photosynthesis process of ginkgo, detached branches of ginkgo were subjected to several temperature levels (25 ℃、30 ℃、35 ℃、40 ℃、45 ℃) for 1 h. Subsequently chlorophyll fluorescence parameters were determined. The data from this study showed the high temperature stress decreased the maximum fluorescence (Fm), potential photochemical efficiency (Fv/Fo), maximum photochemical efficiency of PSⅡ (Fv/Fm). Simultaneously, maximum relative electron transport rate (rETRmax), actual photochemical efficiency of PSⅡ(Yield), and photochemical quenching coefficient (qP) were decreased gradually. In contrast, the minimal fluorescence (Fo), and non-photochemical quenching coefficient (NPQ) were increased. These results indicated photosynthesis of detached leaves of ginkgo is very sensitive to high temperature stress and low temperature perhaps damaged the photosynthesis apparatus, resulting in reduction in the light energy absorption and conversion, and photosynthetic electron transport efficiency. Moreover, the chlorophyll fluorescence dynamic parameters of ginkgo leaves are very sensitive to high temperature and can be employed in the screening of the high-temperature tolerant ginkgo cultivars. |
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