盐胁迫对悬铃木幼苗生理指标及叶绿素荧光参数的影响

旨在了解悬铃木抗盐性的生理机理，对筛选抗性强的悬铃木树种具有重大意义。以分别采自山东淄博种源三球悬铃木、河南巩义种源二球悬铃木、上海松江种源一球悬铃木的1年生实生苗为材料，研究其在盐质量分数分别为0．2％、0．4％、0．6％下植株叶片中的生理指标以及叶绿素荧光指数而、Fm、Fv／Fm、qP的变化。结果表明：（1）在NaCl胁迫下，3种悬铃木幼苗植株内MDA含量整体呈上升趋势，但3种幼苗增幅不同，三球增幅最大，一球增幅远远小于其他。（2）在对照时，3种悬铃木幼苗植株内SOD含量没有明显变化，但随着NaCl浓度的增加，3种悬铃木幼苗SOD含量均上升且三球上升幅度最大，一球最小。（3）随着NaCl浓度的增加，3种悬铃木幼苗而均增加，Fm、Fv／Fm、qp呈下降趋势，且三变化幅度最大，二球次之，一球最小。综合各项指标，3种悬铃木幼苗的耐盐性强弱依次是：三球〈二球〈一球。

Effects of Salt Stress on Physiological Indexes and Chlorophyll Fluorescence Parameters of Sycamore (Platanus orientalis L.) Seedlings

This paper aimed to understand the physiological mechanisms of sycamore salt resistance, for screening resistance strong sycamore tree species was of great significance. To collected three balls sycamore from Zibo Shandong Province, two bails sycamore from Gongyi Henan Province, a ball sycamore＇ s annual seedlings for material from Songjiang Shanghai Province, physiological indicators of plant leaves and chlorophyll fluorescence index Fo, Fro, Fv/Fm, qp changes were studied in the salt mass fraction were 0.2%, 0.4%, 0.6%. The results showed that （1） under Nacl stress, the MDA content in three kinds of sycamore seedling largest plants showed rising trend on the whole, but the growth of three kinds of seedlings was different, the increased in three balls, and a ball was far less than others. （2） In contrast, the three kinds of sycamore seedling plants had no significant changes within the SOD content, but with the increase of NaCI concentration, three kinds of sycamore seedling SOD levels were increased and the largest increase in three balls, a ball was min. （3） With the increase of NaCl concentration, three kinds of sycamore seedlings Fo all increased, Fro, Fv/Fm, qp were on the decline, and variation in three balls was the largest, two balls followed, a ball was min. Integrated indicators, the salt resistance of three kinds of sycamore seedlings strength were in turn： three balls 〈 two balls 〈 a balL