华山松不同叶龄、部位针叶叶绿素荧光参数的动态变化规律
Dynamic laws of chlorophyll fluorescence parameters in needle leaves of different leaf ages and locations of Pinus armandii
段爱国 1保尔江 2张建国 1何彩云 1赛力克3
作者信息
- 1. 中国林业科学研究院林业研究所,国家林业局林木培育重点实验室
- 2. 新疆阿勒泰地区林业科学研究所
- 3. 新疆阿勒泰地区哈巴河县平原林场
- 折叠
摘要
该文探讨了华山松不同叶龄、不同部位的针叶叶绿素荧光参数的动态变化规律.结果表明:①华山松针叶的PSⅡ最大光能转换效率(Fv/Fm)的日变化呈现明显的先减小后增大的动态规律,在12:00达到最低值;而向阳针叶的非光化学猝灭系数(NPQ)在12:00达到最大值,说明华山松具有在强光条件下通过热耗散作用降低光合机构受光抑制程度和免受光氧化破坏的机制.②华山松阴生叶的各项荧光参数日变化幅度均较小,阴生叶的最大荧光(Fm)、可变荧光(Fv)、Fv/Fm、电子传递效率(Fm/Fo)及PSⅡ潜在活性(Fv/Fo)均明显高于阳生叶,但阴生叶的NPO明显低于阳生叶.尤其是幼叶.③针叶叶龄越小,Fv/Fm越低,针叶所受光抑制程度越深,热耗散机制启动得越早、越强.④与阳生叶相比,在不同测定时期阴生叶均具有更高的Fv/Fo和Fv/Fm;阴生、阳生针叶荧光参数的变化较叶龄荧光参数的变化更为稳定.
Abstract
Dynamic laws of chlorophyll fluorescence parameters in needle leaves of different leaf ages and locations of Pinus armandii Franch were studied in this paper. The results are as follows: l)The daily change of Fr/Fm (maximal photochemical efficiency of PS Ⅱ in the dark) in needle leaves of P. armandii obviously presented a descending-ascending trend,the lowest value was at 12:00 and the NPQ (non-photochemical quenching) of sunny needle leaves arrived at the maximum at noon. This shows that P. armandii has the mechanism of declining the degree of photosynthetic inhibition and avoiding the destruction by light-catalyzed oxidation through hot dissipation under strong light. 2) The daily change range of every chlorophyll fluorescence parameter in shade needle leaves of P. armandii was small and its values of Fm(maximal fluorescence), Fr (variable fluorescence), Fr/Fm, Fm/F0, (electron transfer rate), Fr/F0 (potential activity of PS Ⅱ) were obviously higher than those in sunny needle leaves and the NPQ of shade leaves was obviously lower than that of sunny leaves, especially young leaves. 3) The smaller needle age was, the lower potential light energy translation efficiency was and the deeper photosynthetic inhibition would be produced, the more early and strong the hot dissipation started. 4)Comparing to sunny needle leaves, shade needle leaves had the higher PS Q potential activity and inner light energy translation efficiency. The variation of chlorophyll fluorescence parameters of sunny or shady needle leaves was stabler than that of needle age.
关键词
华山松/叶绿素荧光/叶龄/阳生叶/阴生叶/日动态/旬变化Key words
Pinus armandii/chlorophyll fluorescence/leaf age/sunny needle leaves/shade needle leaves/daily change/ten-day change引用本文复制引用
出版年
2008
国家科技期刊平台
NSTL
维普
万方数据