牵牛花种子在不同pH值及温度下的发芽研究
毕业论文关键词： 牵牛花；pH值；萌发；温度
Morning glory flowers germinated at different pH values and different temperatures
Abstract: This article introduces the profile of the morning glory flowers. The seeds of morning glory are germinated at different temperatures and in the environment of different pH values. The range of the pH values is from 4.5 to 9.5.And the gradient value is added as 0.5.Seeds are germinated on the saturated filter papers which are infiltrated by the solution of different pH values. The experiment has been done in summer (the average temperature was 28.6℃) and winter (the average temperature was 13.2℃) .Observed the germination of seeds at the initial stage and the growth status at the later stage. Recorded the number of germination, root length, bud length, the number of cotyledon which grown at different times. From these data, calculated the germination percentages, germination potential, germination index, the vigor index. To explore the appropriate pH value and temperature for morning glory flowers to grow by comparison and analysis. Drew the following conclusion: in a certain range of pH values, morning glory flowers showed the strong adaptability of both ends of pH values. When these seeds were in the environment of pH 5.0 and pH 5.5, their condition is the best. And morning glory flowers are suitable for higher temperature to grow.
Key Words: morning glory flowers, pH values, germination, temperature
目 录
1 前言 5
1.1关于牵牛花 5
1.2国内对于牵牛花的研究进展 5
1.3酸和碱环境对植物生长的影响 6
1.4不同因素对种子萌发的影响 6
1.4.1 pH值对种子萌发的影响 7
1.4.2 温度对种子萌发的影响 7
2 实验材料与方法 7
2.1实验材料 7
2.2实验方法 8
3 实验结果与分析 10
3.1在平均温度为28.6℃的环境下牵牛的发芽情况 10
3.1.1发芽率 10
3.1.2芽长 11
3.1.3子叶的生长情况 11
3.1.4发芽势和发芽指数和活力指数 12
3.2在平均温度为13.2℃的环境下牵牛的发芽情况 12
3.2.1发芽率 12
3.2.2芽长 13
3.2.3子叶的生长情况 14
3.2.4发芽势和发芽指数和活力指数 14
3.3实验结果比较分析 15
3.3.1同一温度不同pH值情况 15
3.3.2同一pH值不同温度情况 21
4 讨论与结论 25
4.1讨论 25
4.2结论 25
致 谢 26
参考文献 27
1 前言
1.1 关于牵牛花
圆叶牵牛[P. purpurea ( L. )Voigt]是属于旋花科(Convolvulaceae)牵牛属(Pharbitis Choisy)，一年生，草本花卉植物，原产美洲地区。花型似喇叭，又被称之为朝颜和喇叭花，因为花色繁多并且花期较长，常常被用于垂直绿化和庭院配置。花期一般在5月至9月，果期是8-10月。叶子的基部呈心形，叶全缘，叶面有绒毛，叶柄与总花梗近似长度。种子呈三棱型卵状，表面有黑褐色的短绒毛。花腋生，伞形花序，花梗长1-1.5cm，萼片5深裂，花冠是漏斗状，雄蕊5，子房3室，蒴果近球形。
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