《氯化钠和碳酸钠胁迫对小麦幼苗生理特性的影响》-毕业论文设计（学术).doc

w w 论文题目 氯化钠和碳酸钠胁迫对小麦幼苗生理特性的影响 摘 要 本试验以科大小麦种子为材料，研究不同浓度NaCl和Na2CO3对小麦种幼苗生理特性的影响，探讨不同盐分胁迫对小麦种子幼苗生长量、根冠比、含水量、叶绿素以及幼苗可溶性糖含量的影响。试验主要采用纸床发芽法进行培养，两种盐分均以Na+浓度为标准，设置了5个处理：50、100、150、200mmol·L－1，以0 mmol·L－1的NaCl处理作为对照。研究结果表明： 1、不同浓度的NaCl和Na2CO3对小麦种幼苗生理特性均产生影响，受害程度随盐胁迫浓度的增加而趋于严重，碱性盐Na2CO3对小麦幼苗生长量、根冠比的抑制作用大于中性盐NaCl。 2、NaCl和Na2CO3胁迫下小麦幼苗的叶绿素含量、可溶性糖含量随Na+浓度的增加而下降，在相同Na+浓度下，Na2CO3使叶绿素含量和可溶性糖含量下降的幅度明显大于NaCl。 综上所述：在Na+浓度相同时，Na2CO3胁迫对小麦幼苗生理伤害要大于NaCl胁迫。 关键词：氯化钠，碳酸钠，胁迫，小麦幼苗，生理特性 Effects of NaCl Stress and Na2CO3 stress on physiological property of wheat Seedlings ABSTRACT In this experiment，HAUST9612 wheat varieties were used to study the different concentrations of NaCl and Na2CO3 on the physiological characteristics of wheat seedlings in the impact study of salt stress on seedling growth of wheat seed， root to shoot ratio， water content，chlorophyll and soluble seedlings sugar content. Germination test bed used mainly paper culture method, two are Na + concentration of salt as the standard， set of 5 treatments： 50，100，150，200 mmol /L-1，with 0 mmol /L-1 NaCl control. The results show that： 1，different concentrations of NaCl and Na2CO3 on wheat seedlings in both physiological impact on the victims with the extent of the increasing concentration of salt stress more seriously， alkaline salt Na2CO3 on wheat seedling growth, root shoot ratio than the inhibition of neutral salt NaCl. 2， NaCl and Na2CO3 wheat seedlings，chlorophyll content，soluble sugar content increased with the Na + concentration decreased in the same Na + concentration，Na2CO3 the chlorophyll content and the decrease in soluble sugar content was significantly greater than NaCl. In summary： in the same Na + concentration， Na2CO3 stress on wheat seedlings physical harm is greater than NaCl stress. KEY WORDS: sodium chloride, sodium carbonate, stress, wheat seedling, physiological characteristics 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc295735570 摘 要 PAGEREF _Toc295735570 \h I HYPERLINK \l _Toc295735572 ABSTRACT PAGE