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外源Ca和IBA对NaCl胁迫下能源植物杂交狼尾草幼苗生长的影响 王宇鹏 刘晓娟 林静 刘艳 陈敏* 山东师范大学生命科学学院, 山东省逆境植物重点实验室, 济南 250014 摘要：以能源植物杂交狼尾草 Pennisetum americanum × P. purpureum 为实验材料在NaCl处理条件下用外源IBACaCl2处理，测定植物的存活率、鲜重、干重、株高、生根数和地上地下的离子含量。结果表明，经过IBA溶液处理的杂交狼尾草幼苗的存活率、鲜重、干重、株高、生根数明显高于未处理的幼苗；在NaCl胁迫下，随着外源Ca浓度的升高，杂交狼尾草的存活率、鲜重、干重、株高、生根数以及Ca含量都明显升高并在2 mmolL Ca时达到最大值；Na+、Na+/K+降低并在2 mmolL时达到最小值。表明外源Ca和IBA对NaCl胁迫下杂交狼尾草生长有促进作用，可以缓解NaCl胁迫对生长的抑制作用，提升杂交狼尾草幼苗成活率最适的Ca浓度为2 mmolL。 关键词：杂交狼尾草，IBA，Ca，NaCl胁迫Effects of Exogenous Ca and IBA on Growth of Energy Plant Hybrid Pennisetum Seedings under NaCl Stress Yupeng Wang, Xiaojuan Liu, Jing Lin, Yan Liu, Min Chen* Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, Shandong 250014, PR China Abstract Energy plant hybrid Pennisetum Pennisetum americanum × P. purpureum seedings were treated with exogenous Ca and IBA under NaCl treatment. The survival rate, fresh weight, dry weight, plant height, root numbers, ion contents of shoots and roots were measured. Results indicated that the survival rate, fresh weight, dry weight, plant height, root numbers of hybrid Pennisetum seedings pretreated with IBA obviously higher than that untreated; Under NaCl stress, the survival rate, fresh weight, dry weight, plant height, root numbers and contents of Ca of hybrid Pennisetum seedings significantly increased with the increasing of Ca content and maximized at the content of 2 mmol/L Ca; The content of Na+ and Na+/K+ decreased with the increasing of Ca content and minimized at the 2 mmol/L Ca. The results showed that exogenous Ca and IBA had promoted the growth of hybrid Pennisetum seedings under Nacl stress, and relieved NaCl stress on hybrid Pennisetum, increased the survival rate and salt tolerance of hybrid Pennisetum seedings. The optimum content of Ca was 2 mmol/L. 前言： 据联合国教科文组织（UNESCO）和粮农组织（FAO）不完全统计，全世界盐碱地面积为9.54亿公顷[1]，持续大面积的耕地加快了土壤盐渍化程度，也使次生盐碱地产生加快，致使世界淡水资源缺乏，严重限制了灌溉农业的可持续发展。我国盐碱土的面积约1亿公顷，约占我国耕地面积的25%，如能充分合理利用这部分资源，使其发挥潜在的价值，中国农业可持续发展将会