盐生草种子萌发的耐盐性及幼苗的耐干燥特性研究  

Studies on Salt Stress of Halogeton glomeratus Seedings and Its Desiccation Tolerance

作　　者：布海丽且姆.阿卜杜热合曼 严成[2] 魏岩[1] 

机构地区：[1]新疆农业大学草业与环境科学学院,乌鲁木齐830052 [2]中国科学院新疆生态与地理研究所,乌鲁木齐830011

出　　处：《新疆农业大学学报》2011年第5期387-392,共6页Journal of Xinjiang Agricultural University

基　　金：国家自然科学基金项目(30770374);教育部高等学校博士学科点专项科研基金(20070758002)

摘　　要：分别用不同浓度的NaCl处理盐生草种子,分析盐分对种子萌发的影响。研究表明,浓度低于0.05mol/L的NaC1溶液对萌发的影响不大;但从0.10mol/L起,萌发率随着浓度增高而降低,且萌发率与盐浓度呈显著的负相关关系。20d后,将未萌发的种子转移至蒸馏水中,最终萌发率都达到了对照种子的85%以上,表明盐胁迫下种子仍保持较高的萌发潜力;种子萌发恢复率与处理盐浓度之间呈显著正相关关系。在自然生境中萌发的幼苗可能会整个暴露在空气中遭受干旱胁迫,或者萌发后的幼苗因无后续的降雨而变干。但是,盐生草幼苗早期具有忍受干燥,在下次水合后能够恢复生长的能力。幼根的长度和干燥时间影响幼苗的生长恢复率。The seeds of Halogeton glomeratus were treated with different NaCl concentration,and the effects of salinity on seeds germination were analyzed in this study.The results indicated that NaCl concentrations density,which was under 0.05 mol/L,had little impact on seed germination.However,the germination rate decreased with the increase of concentration from 0.10 mol/L.And there was a negative correlation between germination percentage and salt concentrations.After 20 d,all non-germinated seeds from all the salinity treatments were transferred to distilled water,the final rate of germination was more than 85% of controlled seeds.The result showed that the seeds still maintained higher germination potentiality under salt tolerance.There were significant positive correlation relationships between germination and recovery percentage of seeds and salt concentration.In the natural habitats,the germinated seedlings may be wholly exposed to the air and undergo drought stress,or the young seedlings started to be withered because there was no follow-up rainfall.However,Halogeton glomeratus seedlings could resist drought in the early stage and could recover the growth when there was a hydratization in the next time.The length of young roots and drying period had effect on recovery rate of the growth.

关 键 词：盐生草 盐分胁迫 萌发率 幼苗耐干燥性 幼苗恢复率 

分 类 号：S512.1[农业科学—作物学]