生理性黄化香樟叶绿素荧光特性的研究  

Chlorophyll Fluorescence Characteristics of Physiologically Etiolated Cinnamomum camphora leaves

作　　者：袁梦[1] 陈晓娟[1] 秦金舟[1] 刘桂华[1] 

机构地区：[1]安徽农业大学林学与园林学院,安徽合肥230036

出　　处：《江西农业大学学报》2013年第6期1193-1198,共6页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家"十二五"科技支撑计划项目(2011BAD38B0702)

摘　　要：对冬季不同黄化等级的香樟叶片主要叶绿素荧光参数的日变化进行了测定。结果表明:从08:00—16:00,健康和轻度黄化香樟F0(最小荧光)、F m(最大荧光)、F m'(光适应下的最大荧光)、F v(可变荧光)、F v/F m(PSⅡ最大光能转换效率)、F m/F0(电子传递效率)、F v/F0(PSⅡ潜在活性)均呈现先升后降的单峰型,最大值出现在12:00—14:00。而NP,Q(非光化学淬灭系数)在一天中的变化情况则正好相反,呈现先降后升的单谷型,最小值出现在12:00—14:00,中度和重度黄化香樟的各项叶绿素荧光参数变化不明显,呈现水平趋势。健康香樟的F v/F m日均值显著高于黄化香樟,中度和重度黄化等级的香樟则无显著差异,表明健康香樟的PSⅡ光能转化效率明显高于黄化香樟。随着黄化程度的加剧,F m/F0、F v/F0的日均值逐渐降低,表明PSⅡ电子传递效率和潜在活性逐渐降低。黄化香樟的NP,Q日均值显著高于健康香樟,且随黄化程度的加深而增大,表明香樟叶片黄化越严重,其吸收的光能用于热耗散而保护自身光合机构的比例越大。The daily changes of chlorophyll fluorescence parameters of Cinnamomum camphora leaves at different levels of etiolation were studied.The results showed that the F0（ minimal fluorescence）, Fm（ maximal flu- orescence）, Fm＇ （ actual maximal fluorescence）, Fv （ variable fluorescence）, Fv/Fm（ optimal/maximal photochemi- cal efficiency of PSⅡ）,Fm/F0（electron transfer rate）, and FiFo（ potential activity of PSI） first increased and then descended in the healthy and light-etiolated camphor leaves between 08：00-16：00, and the highest values occurred between 12：00 to 14：00.The daily change trend of Np,Q（non-photochemical quenching） was contrary to those parameters mentioned above ,the trend was first increasing and then descending, and the lowest values of Fm/F0 and Fv/Fm occurred in the period of 12：00 to 14：00 ,the chlorophyll fluorescence parameters showed a flat trend in moderate-and severe-etiolated camphor leaves.The average values of Fv/Fm in health camphor leaves were obviously higher than those in the etiolated camphor leaves.The maximal photochemical efficiency of PSⅡ in the healthy camphor leaves was higher, the average electron transfer rate and the potential activity of PSⅡ showed a descending trend.The daily average value of Np,Q in the etiolated camphora leaves was obviously higher than that in the healthy camphor leaves,and increased with the increase of etiolation degree,indicating that the more seriously the leaves were etiolated the higher proportion of light energy was absorbed by camphor leaves to avoid the destruction of photosynthetic tissue through hot dissipation.

关 键 词：香樟 黄化等级 叶绿素荧光参数 日变化 

分 类 号：S511[农业科学—作物学]