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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。
The leaves of 1 ~ 5 leaves with corn seedlings under different light intensities were used as test materials. The photochemical activities of leaves at different positions were studied by detecting the characteristics of chlorophyll fluorescence parameters. The results showed that the fluorescence parameters of leaves at different leaf positions of maize seedlings showed different trends under different light intensities. The leaf Fo at all leaf positions was higher at light intensity of 200 μmol / (m2.s), with a light intensity of 600 μmol / (m2. s), the highest Fv / Fm in leaves at the first leaf position under 200μmol / (m2.s) light intensity was the highest at 600μmol / (m2.s) and 1 000μmol / (m2.s) / Fm were higher than the first three leaves; 2,3 leaves at 1 000μmol / (m2.s) absorption and capture of the energy used for heat dissipation increased the proportion of 4,5-leaf in the 1 300μmol / (m2.s ) Heat dissipation ratio increases. That is, the photochemical activities of maize seedlings 4 and 5 were higher than those of the first 3 leaves under the light intensities of 600 μmol / (m2.s) and 1 000 μmol / (m2.s).