NaHCO_(3)胁迫对饲用燕麦地上部分K^(+)、Na^(+)含量的影响

Accumulation of Na^(+)and K^(+)in Forage Oat Aboveground Part under NaHCO_(3)Stress

本研究对贝勒、骏马、梦龙3个饲用燕麦品种在NaHCO33个浓度梯度(25、50、75 mmol/L)胁迫处理下地上部分K^(+)、Na^(+)含量变化进行了比较研究。结果表明,3个燕麦品种幼苗地上部分K^(+)含量随NaHCO_(3)浓度的增加而先增加后减少,Na^(+)含量随NaHCO_(3)浓度的增加而增加,从而保持一定的K^(+)/Na^(+)盐胁迫适应性;但3个燕麦品种苗期对盐胁迫的敏感度有差异,敏感性从高到低依次为梦龙>骏马>贝勒,贝勒较耐盐碱,适宜本地区种植;3个燕麦品种盐碱胁迫的临界浓度为50mmol/L。本研究结果为燕麦品种耐盐碱性鉴定评价提供了理论依据,并筛选出适宜本地区种植的耐盐碱燕麦品种。

In order to provide a theoretical basis for the identification and evaluation of oat varieties tolerant to salinity and alkali and to screen out the salinity-tolerant oat varieties suitable for planting in this region,this study indoors with Beile,Courser,Magnum three oats varieties as experimental material,using three NaHCO_(3)concentration(25,50,75 mmol/L)solution to water the testing material to determine the content of K^(+)and Na^(+)ions in aboveground part by flame photometer.The results showed that the aboveground K^(+)content of seedlings increased first and then decreased with the increase of NaHCO_(3)concentration,while the Na^(+)content increased with the increase of NaHCO_(3)concentration and the maintenance of a reasonable K^(+)/Na^(+)ion ratio were the regulatory mechanism for oat to adapting to salt stress.The sensitivity of three oat varieties to salt stress had differences and ranked from high to low was Magnum、Courser and Beile,and the critical concentration of NaHCO_(3)stress in this study was 50 mmol/L.