| 野外条件下光强对盾叶薯蓣影响的初步研究 |
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| 引用本文： | 朱杰英,王菊凤,陈军,陈功锡,李鹄鸣.野外条件下光强对盾叶薯蓣影响的初步研究[J].生命科学研究,2001,5(2):155-159. |
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| 作者姓名： | 朱杰英 王菊凤 陈军 陈功锡 李鹄鸣 |
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| 作者单位： | 吉首大学生态研究所, |
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| 基金项目： | 湖南省教委重点学科资助项目（97B36） |
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| 摘 要： | 通过在野外栽培条件下的笼罩实验(4个光强等级1855～2104,913～1004,525～615,141～215μmol*m-2*s-1),发现光强影响盾叶薯蓣的根状茎发芽率、叶面积、叶片丙二醛(MDA)含量、叶片过氧化物酶活性(POD)、叶片含水量以及整个植株的生物量.弱光可能因带入的热能少而对根状茎发芽不利.叶片含水量随光照强度的降低而增多.叶面积随光照强度的减小而增加,在525～615μmol*m-2*s-1光强下,盾叶薯蓣叶片的MDA含量最低,POD活性最低,地上生物量最高,对于地下部分而言,最适光强是913～1004μ*mol*m-2*s-1,在此光强下,根状茎生物量增加近3倍.故在生产中,一定程度的强光逆境是有利的.
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| 关 键 词： | 盾叶薯蓣 光强 叶面积 丙二醛 过氧化物酶 生物量 野外条件 |
| 文章编号： | 1007-7847(2001)02-0155-05 |
| 修稿时间： | 2000年12月29 |
Preliminary Studies on the
Influence of Light Intensity on Dioscorea zingiberensis in Field |
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| ZHU Jieying,WANG Jufeng,CHEN Jun,CHEN Gongxi,LI Huming.Preliminary Studies on the
Influence of Light Intensity on Dioscorea zingiberensis in Field[J].Life Science Research,2001,5(2):155-159. |
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| Authors: | ZHU Jieying WANG Jufeng CHEN Jun CHEN Gongxi LI Huming |
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| Abstract: | Dioscorea zingiberensis grown in field was found to be infl uenced by l ight intensities with cage experiment. The germination ratio of rooted-stem under weak light (141～215μ mol*m- 2*s-1) was only 55%, while those exposed t o stronger sun light were about 100%. Water contents in leaves decreased with the increase of light intensities.Leaf area increased with the decrease of light intensities with an exception of weakest light condition. Under 5 25～615 μmol*m-2*s-1 of light, the content of malondialdehyde (MDA) in leaves a nd the peroxidase (POD) activities were the lowest,whereas the above-ground bi oma ss were the highest.The highest subterranean biomass was obtained in conditio n of 913～1 004 μmol*m-2* s-1 of light exposure . |
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| Keywords: | Dioscorea zingiberensis light intensity leaf area malondialdehyde (MDA) peroxidase (POD) biomass |
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