摘要
以草莓(Fragaria ananassa Duch)为材料,研究其叶片叶绿素荧光参数的日变化。在自然光下,草莓叶片的最大荧光(Fm)、PSⅡ光化学效率(Fv/Fm)、PSⅡ光量子效率(Yield)和光化学猝灭系数(qP)从6:00-18:00均先下降后上升,其中在下午14:00最低;而非光化学猝灭系数(qN)先上升后下降,其中在下午14:00最高。表明在中午强光下,草莓叶片遭受了强烈的光抑制,而热耗散是其主要的光保护机制。
Taking Fragaria ananassa Duch as sample, daily change of chlorophyll fluorescence of F. ananassa by PAM-2100 was studied. The results indicated that in sunny day, daily change of photosynthesis of Fm, Fv/Fm, yield and qP showed V type which decreased at first, then increased and there is the lowest photosynthesis at 14: 00. The non-photochemical quenching rate (qN) increased significantly at first then decreased. It indicated that qN was used mainly to dissipate excess light energy absorbed by PS Ⅱ.
出处
《生物学杂志》
CAS
CSCD
2009年第5期69-70,73,共3页
Journal of Biology
基金
安徽省教育厅基金(KJ2007B169)
安徽省教育厅青年基金(2006jql213)
关键词
草莓
叶绿素荧光参数
日变化
Fragaria ananassa Duch
chlorophyll fluorescence parameter
daily change