摘要
研究了全光照和遮阴棚(7%全光照)两种光强生境下对马耳蕨叶绿素荧光参数的日变化过程。结果显示,日出后,全光照生境下,对马耳蕨叶片的最大光能转化效率(Fv/Fm)、有效光化学量子产量(Fv′/Fm′)、光化学淬灭系数(qP)逐渐下降,其中,Fv/Fm和qP的最小值出现在15:00,Fv′/Fm′的最小值出现在13:00,而非光化学淬灭系数CNPQ(NPQ)和表观电子传递速率(rETR)逐渐上升,并在11:10达到最大值,各项参数值直到第2天清晨才恢复到初始正常水平。遮阴棚环境条件下对马耳蕨反rETR日出后逐渐升高,11:00达到最大值,但仅为全光照下的33.7%,其他4项参数没有显著变化。研究表明,在全光照下对马耳蕨表现出抗光抑制的保护性反应,能够正常生长,不属于典型的阴生蕨类植物。
Under full sunlight and 7 % of sunlight,daily variations of chlorophyll fluorescence parameters were explored in Polystichum tsus-simense.The results showed that after sunrise the maximal efficiency of PS Ⅱ(Fv/Fm),the excitation capture efficiency of PS Ⅱ(Fv′/Fm′) and photochemical quenching(qP) decreased in P.tsus-simense under full sunlight,at 15:00 Fv/Fm and qP were the lowest,at 13:00 Fv′/Fm′ was the lowest.However,the relative electron transport rate(rETR) and non-photochemical quenching(CNPQ) increased and the highest were at 11:00.These 5 parameters could not be recovered until next morning.Under 7% of sunlight RETR increased after sunrise and the higest was at 11:00,but other 4 parameters changed little all the day.Results suggest that P.tsus-simense has photoprotective and grows well under full sunlight.Thus this plant is not a typical shade ferns.
出处
《南京林业大学学报(自然科学版)》
CAS
CSCD
北大核心
2011年第1期135-138,共4页
Journal of Nanjing Forestry University:Natural Sciences Edition
基金
国家自然科学基金项目(30760043)
云南省基础研究重点项目(2009CC003)
国家基础科学人才培养基金项目(J0730652)
教育部高等理工教育教学改革与实践项目(239)
关键词
对马耳蕨
叶绿素荧光参数
日变化
光抑制
Polystichum tsus-simense
chlorophyll fluorescence parameter
diurnal changes
photoinhibition