外源Ca2+对干旱胁迫下沙地云杉幼苗抗旱性生理指标的影响

摘要

Picea mongolica seedlings were used as test materials and soaked in the nutrient solutions with different Ca2+concentrations (0 mmol/L,5 mmol/L,10 mmol/L,20 mmol/L) and different percentages of PEG-6000 (0%、15%、30%) respectively for 6 h,to study the effects of Ca2+ on their main drought resistance-related physiological indexes and to provide reference for the application of Ca2+ in the production of Picea mongolica seedlings in dry sandy soil. The results indicated that Ca2+ could increase the leaf moisture content and soluble protein content,alleviate chlorophyll decomposition,and reduce MDA content. Among the 4 tested gradient concentrations,10 mmol/L Ca2+ had the best results.%　　以盆栽沙地云杉幼苗为试验材料，分别移入含有不同Ca2+浓度（0 mmol/L、5 mmol/L、10 mmol/L、20 mmol/L）和不同百分比的PEG-6000（0%、15%、30%）的植物培养液中处理6 h，研究水分胁迫下外源Ca2+对沙地云杉幼苗主要抗旱生理指标的影响，以期为Ca2+在沙地云杉耐旱生产中的应用提供参考依据。结果表明，外施Ca2+能够提高云杉幼苗叶片含水量和可溶性蛋白质的含量，减缓叶绿素的分解，降低MDA含量。4个梯度Ca2+浓度试验中，以10 mmol/L Ca2+浓度处理对提高云杉幼苗的抗旱性效果最佳。