论文部分内容阅读
以18份引进紫花苜蓿(Medicago sativa L).为材料,采用5种不同浓度NaCl下进行温室苗期耐盐性评价试验。结果表明,地上生物量、地下生物量、株高、存活率这4项指标随盐胁迫浓度的增加都呈递减趋势,且浓度间差异极显著(P<0.01),0.3%盐浓度偏小,不足以反映盐胁迫程度,而0.6%盐浓度过于偏大,导致试验后期幼苗枯萎、死亡,不适合作为引进紫花苜蓿耐盐性评价盐浓度。这4项指标作为耐盐性评价是最直观、最有效的方法。从耐盐生理评价显示,质膜透性和脯氨酸含量随着盐浓度的增加而增加,浓度间差异极显著(P<0.01),这两项指标也可作为耐盐性评价的辅助指标。综合以上耐盐性评价结果显示,材料13、14较耐盐,材料5、6、9、10、17耐盐性较差,其他11份材料为中等耐盐。
The alfalfa (Medicago sativa L.) was introduced in 18 parts, and the salt tolerance of greenhouse seedlings was tested under 5 different concentrations of NaCl. The results showed that the four indexes of aboveground biomass, underground biomass, plant height, and survival rate all showed a decreasing trend with the increase of salt stress concentration (P <0.01), the concentration of 0.3% salt was small, Not enough to reflect the degree of salt stress, while 0.6% salt concentration is too large, resulting in seedlings withered and died later in the experiment, not suitable for the introduction of alfalfa salt tolerance evaluation of salt concentration. These four indicators as salt tolerance evaluation is the most intuitive and most effective way. Physiological evaluation of salt tolerance showed that plasma membrane permeability and proline content increased with the increase of salt concentration, with significant difference (P <0.01). These two indexes could also be used as auxiliary indicators for salt tolerance evaluation . Based on the above results of salt tolerance evaluation, the results show that the materials 13 and 14 are salt-tolerant, the materials 5, 6, 9, 10 and 17 are less salt-tolerant than the other 11 materials.