| 蒲公英苗期盐胁迫反应及耐盐阈值的确定 |
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| 引用本文：刘雅辉，王秀萍，左永梅，张国新，鲁雪林.蒲公英苗期盐胁迫反应及耐盐阈值的确定[J].西北农业学报,2017,26(8):1223~1229 |
| DOI:10.7606/j.issn.1004-1389.2017.08.016 |
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| 基金项目:河北省财政专项（F15R16004，F14C16004）；河北省科技厅科技支撑项目（16226304D）。 |
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| 中文摘要:为筛选耐盐蒲公英品种，采用盆栽试验，分析不同盐分质量分数的滨海原土对蒲公英幼苗的生长发育及体内不同部位Na+和K+质量分数及K+/Na+的影响，通过相关性分析和回归分析，确定蒲公英幼苗期耐盐鉴定指标和耐盐阈值。结果表明，随着土壤盐分质量分数的增加，幼苗存活率、叶长、叶宽、叶片数、地上和地下干物质质量均有所下降，但较低盐分（0.2%）可促进幼苗生长；地上部Na+和K+质量分数及K+/Na+均与土壤盐分质量分数相关，而地下部这些指标与土壤盐分质量分数相关性不大；确定了蒲公英苗期耐盐鉴定指标为叶长，耐盐阈值为0.42%。 |
| 中文关键词:蒲公英 耐盐性 鉴定指标 耐盐阈值 K+/Na+ |
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| Response of Dandelion to Saline Stress and Determination of Salt-tolerance Threshold at Seedling Stage |
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| Abstract:The theoretical basis was provided for selection of salt tolerant dandelion and utilization. Pot experiments were carried out to study the effects of coastal saline alkali soil on growth，the mass concentration of Na+, K+ and K+/Na+ in different parts of dandelion. Salt tolerance index and salt tolerance threshold at the seedling stage of dandelion were determined through correlation analysis and regression analysis. The results showed that the survival rate, leaf length, leaf width, leaf number, aboveground and underground dry mass of the seeding decreased with the increase of the soil salt mass fraction,but the lower salt mass fraction(0.2%) could promote the growth of seedling. The mass cocentratation of Na+, K+ and K+/Na+ were correlated with soil salt mass fraction in the aboveground but not in underground. The leaf length was determined as salt tolerance index and the 0.42% was salt tolerance threshold. |
| keywords:Dandelion Salt tolerance Identified index Salt tolerance threshold K+/Na+ |
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