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4种含笑叶片叶绿素荧光参数Fv/Fm特性的比较
陈辰,何小定,秦金舟,刘桂华
0
(安徽农业大学林学与园林学院,合肥 230036)
摘要:
对深山含笑、阔瓣含笑、金叶含笑和峨眉含笑幼树叶绿素荧光参数Fv/Fm在不同季节的日变化及其与光照(PAR)、气温(Ta)和大气相对湿度(RH)的相关性进行了测定和分析。结果表明,4种含笑幼树叶绿素荧光参数Fv/Fm在春季日变化小,各个时刻的测定值均大于0.75,荧光参数Fv/Fm在春季与其PAR、Ta和RH均无显著相关性。4种含笑叶绿素荧光参数Fv/Fm在夏季的日变化均呈先降后升的趋势,最低值(<0.75)出现在12:00~14:00之间。深山含笑和阔瓣含笑叶绿素荧光参数Fv/Fm与夏季的Ta和RH均分别呈显著负相关和显著正相关,但金叶含笑夏季叶绿素荧光参数Fv/Fm与PAR和Ta呈显著负相关。从叶绿素荧光参数Fv/Fm的日变化趋势和测定值看,深山含笑、阔瓣含笑和金叶含笑的光合机构在夏季12:00~14:00均受到可逆性胁迫影响。峨眉含笑夏季叶绿素荧光参数Fv/Fm与Ta和RH分别呈极显著负相关和极显著正相关,且Fv/Fm的测定值在一天中各个时刻均低于0.75,表明其光合机构在夏季受到不可逆性胁迫影响。峨眉含笑叶片叶绿素荧光参数Fv/Fm在秋季日变化呈先降后升的趋势,最低值(0.72)出现在14:00,且与RH呈显著正相关,其它3种含笑的Fv/Fm在秋季的日变化小,各个时刻的测定值均在0.75以上,且与其PAR、Ta和RH无显著相关性。4种含笑叶绿素荧光参数Fv/Fm在冬季的日变化均呈先升后降的趋势,且均与Ta呈显著正相关。从叶绿素荧光参数Fv/Fm的日变化趋势和测定值看,4种含笑的光合机构在冬季只受到了可逆性胁迫影响。
关键词:  含笑  叶绿素荧光  Fv/Fm  相关性  气象因子
DOI:
投稿时间:2012-04-20
基金项目:国家“十二五”科技支撑项目(2011BAD38B0702)资助。
Comparison of chlorophyll fluorescence Fv/Fm characteristics of four michelia trees
CHEN Chen,HE Xiao-ding,QIN Jin-zhou,LIU Gui-hua
(School of Forestry and Landscpe Architecture, Anhui Agricultural University, Hefei 230036)
Abstract:
The diurnal changes of chlorophyll fluorescence parameter Fv/Fm of seedlings of Michelia maudiae, Michelia platypetala, Michelia foveolata and Michelia wilsonii in different seasons and correlations between Fv/Fm values and photosynthetically active radiation(PAR), air temperature(Ta)and air humidity(RH)were studied in this paper. The diurnal change range of Fv/Fm of four michelia trees in spring was small and the values in a whole day were higher than 0.75. There was no significant correlation between the chlorophyll fluorescence parameter Fv/Fm of four michelia trees and PAR, Ta and RH in spring. The values of Fv/Fm in a wole day in summer showed a trend of descending first and then ascending and the lowest values(﹤0.75)appeared between 12:00 and 14:00. A negative relation was founded between Fv/Fm value of Michelia maudiae and Ta and RH, while a positive correlation between Fv/Fm value of Michelia platypetala and Ta and RH in summer; there was a significant negative correlation between Fv/Fm value of Michelia foveolata and PAR and Ta in summer. Based on the diurnal changes trend and the Fv/Fm value in a whole day, the effects of reversible stress on the photosynthetic tissues of Michelia maudiae, Michelia platypetala and Michelia foveolata were founded in summer from 12:00 to 14:00. The significant negative correlation and positive correlation between the values of Fv/Fm of Michelia wilsonii and Ta and RH were also founded in summer, respectively. The values of Fv/Fm of Michelia wilsonii in a whole day in summer were below 0.75, indicating that there was irreversible stress effect on the photosynthetic tissues of Michelia wilsonii in summer. The diurnal change of Fv/Fm of Michelia wilsonii in autumn presented a trend of descending first and then ascending, and the lowest value (0.72)was at 14:00, and there was a significant postive correlation between the value of Fv/Fm and RH. The diurnal changes of Fv/Fm of the other three michelia trees in autumn were small, and the values were higher than 0.75 in a whole day. Meanwhile, no significant correlation between the values of Fv/Fm of three michelia trees mentioned above, and PAR, Ta and RH were founded from experimental results in autumn. The diurnal changes of Fv/Fm of four michelia trees in winter were ascending at first and then descending, and significant postive correlation between the Fv/Fm and Ta was showed from the experimental results. The diurnal changes trend and the values of Fv/Fm in a whole day in winter indicated that the effects of stress on the photosynthetic tissues of four michelia trees were only reversible.
Key words:  michelia trees  chlorophyll fluorescence  Fv/Fm  correlation  meteorological factors

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