高浓度CO2在盐胁迫下对草地早熟禾激素及离子平衡的影响
毕业论文关键词：草地早熟禾；盐胁迫；高浓度CO2；离子平衡；激素
Effects of elevated CO2 on the level of hormone and ion balance under salt stress in kentucky bluegrass
Abstract: Due to the current serious environmental pollution, salinized soil has further increased, seriously affecting the growth of plants. And the rising concentration of carbon dioxide in the atmosphere makes turfgrass responses to salt stress to a certain degree. In order to study the mitigation effect of elevated CO2 on the balance of hormones and ions in plant under salt stress, we found that Kentucky bluegrass as a material in this experiment. Plants were exposed to either elevated CO2 (800±10 μmol•mol-1) or ambient CO2 (400±10 μmol•mol-1) and maintained well-watered (control) with 1/2 Hoagland nutrient solution or subjected to salinity stress by irrigating plants with NaCl solution (200 mM). The results showed that salt stress caused decline in turf quality (TQ), leaf relative water content (RWC), leaf net photosynthetic rate (Pn) and the cellular membrane stability. And elevated CO2 can alleviate these adverse effects by improving photosynthesis, increasing cellular membrane stability, regulating the concentration of Na+/K+ to keep iron balance and regulating osmotic through hormones.
Key words: Kentucky bluegrass; Salt stress; Elevated CO2; Ion balance; Hormones
目录
摘要 1
关键词 1
Abstract 1
Key words 1
引言 1
1.材料与方法 2
1.1 植物材料与生长条件 2
1.2 试验设计 2
1.3 测定指标与方法 3
1.3.1 草坪质量 3
1.3.2 相对生长速率 3
1.3.3 相对含水量 3
1.3.4 电解质渗透率 4
1.3.5 净光合速率 4
1.3.6 叶绿素含量 4
1.3.7 钾离子含量 4
1.3.8 激素 4
1.4 数据处理 4
2.结果与分析 5
2.1 草坪质量 5
2.2 相对含水量 5
2.3 相对生长速率 6
2.4 电解质渗透率 7
2.5 叶绿素含量 8
2.6 净光合速率 8
2.7 钠离子含量 9
2.8 钾离子含量 9
2.9 激素含量 10
2.9.1 脱落酸含量 10
2.9.2 赤霉素含量 11
3.讨论 12
致谢 13
参考文献 14
高浓度CO2在盐胁迫下对草地早熟禾激素及离子平衡的影响
由于水资源日益减少以及人类对化肥的过度使用等原因，全球土壤盐渍化日渐严重。过多的盐分通过毛管水至地表，盐分在水分蒸发后积累，这就造成了土壤盐渍化。据统计，全世界的盐碱地面积将近9.56亿公顷，约占世界陆地面积的7.6%。我国的盐碱地也规模相当大，近1/5耕地发生盐碱化。其中形成原因可以划分为原生盐化型、次生盐化型和各种碱化型，分别占总面积的 52%、40%和 8%[1]。沿海区域因为地理位置导致氯化钠盐土较多，而内陆的地区多因为不正确灌溉方式造成大面积的次生盐渍化土壤[2]。