毕业设计论文--高温胁迫对西葫芦幼苗生理生化特性的影响.pdf

高温胁迫对西葫芦幼苗生理生化特性的影响
高温胁迫对西葫芦幼苗生理生化特性的影响
作者:胡春雨指导教师:刘建辉副教授

摘要:以耐热性不同的两个西葫芦品种为试材,以25℃为对照,研究38℃高温胁迫
对其幼苗叶片生理生化特性的影响。结果表明:在38℃高温胁迫下,西葫芦幼苗叶片丙二醛
(MDA)含量、相对电导率、超氧自由基含量、过氧化氢含量均升高。耐热性强的品种MDA
含量、过氧化氢含量、超氧自由基含量增幅小于耐热性弱的品种;相对电导率虽然有增加趋
势,但两品种之间差异不显著。高温胁迫36h,两个西葫芦品种幼苗叶片的丙二醛( MDA)、
超氧自由基和过氧化氢含量均达到最大值,表明38℃处理36h对西葫芦幼苗叶片有明显伤害。

关键词:高温胁迫;西葫芦;幼苗;生理生化特性

Effects of heat stress on physiogical and biochemical
characteristic of pumkin Seedling
Student: Hu Chunyu Teacher: Liu Jianhui

Abstract:Seedlings of two pumkin cultivars were treated with high temperature (CK:25
℃;High temperature stress: 38℃).The activity of Physiogical and biochemical characteristic in
leaves of pumkin were results showed that after being treated with high
temperature,MDA content, Relative conductivity, Content of Superoxide radical, content of
Hydrogen Peroxide increased, and the increased degress of MDA content, content of Hydrogen
Peroxide, Content of Superoxide radical in cultivar tolerant to high temperature were lower than
that of cultivar sensitive to high temperature(jingying );Although the relative conductivity
has the increase tendency, but between two varieties the difference is not remarkable. The high
temperature forces 36h, Two pumpkin variety seedling piece third dial (MDA), Content of
Superoxide radical,and content of Hydrogen Peroxide Maximizing, Indicated 38℃ processes
36h to have the obvious injury to the pumpkin seedling.

Key words: Heat stress ; Cucurbita pepo L.;Seedling ;Physiogical and biochemical
characteristic




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高温胁迫对西葫芦幼苗生理生化特性的影响
由高温引起植物伤害的现象称为热害。而植物对高温胁迫的适应称为抗热
性。但热害的温度很难界定,因为不同种类的植物对高温的忍耐程度有很大差异。
植物受高温伤害后会出现各种症状:树干(特别是向阳部分)干燥、裂开;
叶片出现死斑,叶片变褐、变黄;鲜果(如葡萄、番茄等)烧伤,后来受伤处与
健康处之间形成木栓,有时甚至整个果实死亡;出现雄性不育,花序或子房脱落
等异常现象。
西葫芦(Cucurbita pepo L.)一年生草质藤本(蔓生),有矮生、半蔓生、
蔓生三大品系。多数品种主蔓优势明显,侧蔓少而弱。主蔓长度:矮生品种节间
短,蔓长通常在 5 ㎝以下,在日光温室中有时可达 1m(因生长期长); 半蔓生品
种一般约 80cm;蔓生品种一般长达数米。具叶卷须,