不同燕麦品种对NaCl胁迫的响应及其耐盐阈值

Response of different oat varieties to NaCl stress and its salt tolerance threshold

为探明不同燕麦品种的耐盐程度,通过水培试验研究了不同燕麦品种对NaCl单盐胁迫的响应,并计算了它们的耐盐阈值。结果表明:与对照相比,NaCl浓度为0.3%、0.6%、0.9%和1.2%的4个盐胁迫处理对燕麦的生长发育均有一定影响,NaCl浓度升高到0.3%后,所有燕麦品种的株高、分蘖数和部分品种的生物量显著降低,所有品种的叶绿素含量、存活率及白燕2号的生物量无显著变化;NaCl浓度升高到0.6%后,所有品种的各项指标均显著降低;0.9%的NaCl对燕麦胁迫比较严重,存活率为对照的33.3%~66.7%,株高为对照的48.7%~63.7%,相对生长量为对照的36.9%~51.3%;NaCl浓度达到1.2%时大部分燕麦不能正常成苗,白燕2号、燕科2号、燕科1号和草莜1号的存活率分别为33.3%、21.4%、8.3%和0。不同品种燕麦的生物量下降50%时的NaCl浓度为0.591%~0.819%,白燕2号的耐盐阈值最大,其次是燕科2号和燕科1号,草莜1号最低,简化后的平均值分别为0.82%、0.71%、0.71%和0.60%。总体上看,不同燕麦品种对NaCl胁迫反应不同,尤其是NaCl浓度升高到0.6%以上时,品种间差异显著,白燕2号的存活率、分蘖数、生物量和相对生长量均最大,是耐盐性较强的优良品种,草莜1号的存活率、叶绿素含量和相对生长率最低,对盐胁迫较敏感,在改良盐碱地中应慎用。

A hydroponic experiment of different oat varieties in response to NaCl stress and their salt tolerance threshold were carried out to understand the degree of salt tolerance of different oat varieties. Five degree of NaCl concentration were set as 0, 0.3%, 0.6%, 0.9% and 1.2 %. The results showed that compared with the control group, the plant height, tiller number of all varieties of oat and the biomass of some varieties decreased significantly at 0.3% NaCl concentration;chlorophyll content, survival rate of all varieties of and the biomass of Bai Yan No. 2 had no significant change;when the concentration of NaCl increased to 0.6%, the indexes of all varieties were significantly decreased; NaCl stress was more serious in 0.9% treatment;the survival rate was 33.3% ~66.7%, plant height 48.7% ~63.7%, the relative growth rate of36.9% ~51.3% compared with the control. Most oat seedlings cannot be normal in 1.2%;the survival rate of Baiyan No. 2,Yan Ke No. 2, Yan Ke No. 1 and Cao You No. 1 were 33.3%, 21.4%, 8.3% and 0 respectively. The salt tolerance thresholdof different oat varieties were 0.591% ~ 0.819%; Baiyan No. 2 was the largest; Yan Ke No. 2 and Yan Ke No. 1 were the second;Cao You No. 1 was the lowest;their simplified value were 0.82%, 0.71%, 0.71% and 0.60 %. Overall, the response of different oat varieties to NaCl stress and its salt tolerance threshold were different.The salt tolerant of Baiyan No. 2 was strong and Cao You No. 1 was sensitive to salt stress.