毕业论文---干旱胁迫下镜面掌光合作用的动态变化研究.doc

PAGE 东北农业大学学士学位论文 学号：131000005232036 干旱胁迫下镜面掌光合作用的动态变化研究 The dynamic changes of photophysiological characters of the mirror palm under drought stress 干旱胁迫下镜面掌光合作用的动态变化研究 1 - 摘 要 镜面掌是最普遍的室内观叶植物之一，其具有植株低矮，叶形美丽，色泽青绿，繁殖力强，生命力旺盛，养护成本低等优点而受人们喜爱。本研究通过温室盆栽试验方法，研究了观叶植物镜面掌Pilea peperomioides Diels在不同梯度干旱胁迫及复水后的光合生理反应，探索在干旱胁迫下镜面掌的光合生理指标的变化，分析干旱胁迫程度对各光合生理指标的影响，为镜面掌抗旱生理的研究提供理论依据和技术支持。本研究主要结果如下： 在干旱胁迫下，镜面掌的净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）、胞间CO2浓度（Ci）四项光合生理指标均有显著变化，随胁迫程度的加重净光合速率（Pn）、气孔导度（Gs）和蒸腾速率（Tr）均有显著降低，胞间CO2浓度（Ci）呈现先降低、但最终上升而累积的现象，说明干旱胁迫可以显著影响植物的光合作用，且干旱胁迫的天数越多镜面掌光合能力下降的越明显，即干旱胁迫程度越大对植物的影响也越大。在对镜面掌干旱胁迫后进行复水处理，净光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）、胞间CO2浓度（Ci）四项指标均有所增加，干旱胁迫天数越少的，其恢复能力也越强，但是都显著低于对照的水平。 关键词：镜面掌；干旱胁迫；光合生理 Abstract Under drought stress, the mirror palm return of net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), intercellular CO2 concentration (Ci) photosynthetic physiological indexes of four significant changes, with the stress degree increased net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate were significantly lower (Tr), intercellular CO2 concentration (Ci) to reduce, increase accumulation phenomenon but in the end,Shows that drought stress can significantly affect plant photosynthesis, and the more the number of days drought stress mirror palm photosynthetic capacity decreased, the more obvious, namely, the influence of the greater the degree of drought stress on plant. After palm of drought stress to water treatment, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr),intercellular CO2 concentration (Ci) four indicators were increased, the less drought stress days, its recovery ability is stronger, but were significantly lower than control. Key words: mirror palm; drought stress; photophysiological characters 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc356636655 摘 要 PAGEREF _Toc356636655 \h I HYPERLINK \l _Toc356636656 1 前言 PAGEREF _Toc356636656