| 摘要: |
| 【目的】探索亚低温及水分双因素对番茄幼苗生理特性的影响，为亚低温条件下培育番茄壮苗和节水灌溉提供理论基础。【方法】以番茄为材料，在温室内采用盆栽方式，以适温(18～30 ℃)环境为对照，研究亚低温(4～20 ℃)条件下，分别灌以蒸腾蒸发量(ET) 60%，80%，100%和120%的水分后，对温室番茄幼苗叶片硝酸还原酶活性、可溶性糖和蛋白含量、光合特性及叶绿素荧光参数的影响。【结果】与适温环境相比，在 4 种灌溉条件下，亚低温均抑制了番茄幼苗的生长，使番茄幼苗叶片硝酸还原酶活性降低，可溶糖含量升高，可溶性蛋白含量降低，净光合速率降低，水分利用效率升高，叶绿素荧光参数中的光系统Ⅱ最大量子效率（Fv/Fm）、光系统Ⅱ的实际量子效率（ΦPSⅡ）、光化学淬灭系数（qP）略有升高，初始荧光（Fo）和非光化学淬灭系数（NPQ）降低。【结论】总体认为，补充 100%ET的水分有利于番茄幼苗适应亚低温环境。 |
| 关键词: 亚低温及水分双因素 番茄幼苗 硝酸还原酶 光合作用 叶绿素荧光参数 |
| DOI： |
| 分类号: |
| 基金项目:国家高新技术研究与发展计划（“863”计划）项目（2011AA100504）；国家“十二五”科技支撑计划项目(2011BAD12B03-3) |
|
| Effects of sub-low temperature and water double factors on physiological properties of tomato seedling |
|
|
| Abstract: |
| 【Objective】This study explored the sub-low temperature and water double factors on physiological characteristics of young tomato plants in greenhouse.【Method】With potted tomato plants in greenhouse as the experiment material,and with the plant under normal temperature(18-30 ℃) as control treatment,the influences of sub-low temperature (4-20 ℃) and supplementary ET irrigation amount (60%,80%,100% and 120%) on the physiological and biochemical indices,photosynthetic characteristics and chlorophyll fluorescence parameters of young tomato plants were analyzed.【Result】Compared with normal condition,and under the four irrigation conditions,sub-low temperature restrained the growth of tomato seedlings,reduced nitrate reductase activity,soluble protein content,photosynthetic rate (Pn),Fo and NPQ but increased the content of soluble sugar,water use efficiency,Fv/Fm、ΦPSⅡand qP.The influence of temperature on the young tomato plants was larger than water.【Conclusion】Increasing irrigation by 100% ET helps the tomato seedlings to adapt sub-low temperature environment. |
| Key words: sub-low temperature and water double factors tomato seedling nitrate reductase activity photosynthesis chlorophyll fluorescence parameters |
