金边黄杨的抗旱性研究+文献综述
关键字： 金边黄杨，抗旱性
Study on drought resistence of Phnom penh boxwood
Abstract:
Leaf area, leaf relative water content, leaf plasma membrane relative permeability, content of soluble sugar, water lose of detached leaves and other data in different periods was measured to study the drought resistance ability of phnom penh boxwood. The process of plant resistance to drought involved in plant morphology, structure and the process of comprehensive changes of physiological indexes. Experimental results of different humidity and experiment time showed that phnom penh boxwood leaf area size changed along with the change of environment. Leaf area is relatively large when humidity, was high. The blade of the leaf area is become relatively small with the decrease of the humidity. Relative water content of the experiment results showed a trend of rise after the first reduce. Detached leaf water loss rate experiments also exhibited a trend of rise after the first reduce, indicating that it adapted to environment gradually. The results here were compared with that of other five classmates, phnom penh boxwood drought resistance is poor.
Key words: phnom penh boxwood , drought resistence,
目 录
1绪论1
1.1前言 1
1.2课题背景 1
1.2.1卫矛属物种简介1
1.2.2卫矛属形态特征2
1.2.3卫矛属生长习性 2
1.3金边黄杨背景 2
1.3.1金边黄杨简介3
1.3.2金边黄杨生长习性3
1.3.3金边黄杨的研究价值3
1.3.4本文研究的必要性3
2 实验相关数据及方法4
2.1金边黄杨的叶面积测定4
2.1.1 实验材料4
2.1.2 实验方法4
2.1.3 实验条件4
2.2 金边黄杨的相对含水量测定4
2.21 实验材料4
2.22 实验试剂4
2.23 实验方法4
2.24 实验条件4
2.3 金边黄杨的质膜相对透性4
2.3.1实验材料4
2.3.2实验试剂4
2.3.3实验方法4
2.4 金边黄杨可溶性糖含量5
2.4.1实验材料5
2.4.2实验试剂5
2.4.3实验方法5
3实验结果6
3.1 实验数据及结果6
3.1.1干旱胁迫对叶面积的影响6
3.1.2干旱胁迫对相对含水量的影响6
3.1.3失水量9
3.1.4质膜相对透性12
3.1.5可溶性糖含量13
3.2优尔种植物失水率的比较分析14
4全文结论与讨论16
4.1全文讨论 16
致谢 17
参考文献18
1：绪论
1.1 前言
植物抗旱性是指陆生植物对干旱环境的适应或抗御能力。由于陆生植物经常受到干旱威胁，在长期适应进化中形成各种抗旱机能。在形态方面，一般陆生植物叶表面有角质层，栅栏细胞排列紧密，有的叶片有绒毛，有的干旱时落叶将叶片卷成筒状。在生理方面可自行开合气孔控制蒸腾。在生化方面，主动提高体内糖分和氨基酸含量以增强吸水能力，主动抑制分解酶活性以保持在干旱下的代谢平衡等。借鉴旱生植物的抗旱机制，抗旱植物应具有下列特征：（1）发达的根系，可吸收土壤深层的水分，在干旱时保证充足的水分供应；（2）灵敏的气孔调节能力和特殊的气孔结构，如气孔内陷，发达的角质层，减少蒸腾失水；（3）在干旱时，叶片卷曲或脱落，降低蒸腾面积，减少蒸腾损失；（4）渗透调节能力强，增大细胞保水或吸水能力；（5）细胞体积小，减轻脱水时的机械损伤；（6）细胞原生质含有较多的保护性物质，如活性氧清除能力强等。
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