光强对玉米幼苗不同叶位叶片叶绿素荧光参数的影响
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S513

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国家自然科学基金项目(31201141、31000673);教育部博士点基金项目(20102103110001、20102103120001)


Effect of Light Intensities on Fluorescence Parameters of Leaves at Different Position in Maize Seedlings
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    摘要:

    以不同光强下的玉米幼苗刚好完全展开的1~5叶位叶片为试验材料,通过检测叶绿素荧光参数特性,研究玉米不同叶位叶片的光化学活性。结果表明:不同光强下玉米幼苗不同叶位叶片的荧光参数变化趋势不同:各个叶位叶片Fo在光强为200μmol/(m2.s)时均较高,在光强为600μmol/(m2.s)时均较低;200μmol/(m2.s)光强下第1叶位叶片Fv/Fm最高,600μmol/(m2.s)和1 000μmol/(m2.s)时第4和5叶Fv/Fm均高于前3叶;2、3叶在1 000μmol/(m2.s)时吸收和捕获的能量用于热耗散的比例增加,4、5叶则在1 300μmol/(m2.s)时热耗散比例增加。即600μmol/(m2.s)和1 000μmol/(m2.s)光强下玉米幼苗4、5叶光化学活性高于前3叶。

    Abstract:

    TChlorophyll fluorescence parameters of 1 to 5 fully extend leaves in maize seedlings grown under different light conditions were investigated in order to study the photochemical activity of maize leaves at different positions.The results showed that the variation tendency of fluorescence parameters of leaves at different position of maize seedlings under different light intensities was different.Fo of leaves at all leaf positions were higher when light intensity was 200 μmol.m-2.s-1,but were lower when light intensity was 200 μmol.m-2.s-1.Fv/Fm of the first leaf was the highest when light intensity was 200 μmol.m-2.s-1.Fv/Fm of the fourth leaf and fifth leaf was higher than of the first,second,and third leaves when light intensity was 600 μmol.m-2.s-1and 1000μmol.m-2.s-1.The proportion of the energy absorbed and captured by the second and the third leaf but used for heat dissipation increased when light intensity was 1000 μmol.m-2.s-1,while that of the fourth and fifth leaf at leaf 2 and 3 under 1000μmol/(m2.s) light condition,but that of leaf 4 and 5 increased when light intensity was 1 300 μmol.m-2.s-1.It meant that the photochemical activity of fourth and fifth leaf was higher than that of the former 3 leaves when light intensity was 600 and 1 000μmol.m-2.s-1.

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朱延姝,郭丽丽,崔震海,胡凯,樊金娟,阮燕晔,张立军.光强对玉米幼苗不同叶位叶片叶绿素荧光参数的影响[J].东北农业科学,2013,38(4):1-4,14.

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  • 收稿日期:2013-04-09
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  • 在线发布日期: 2024-12-06
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