盐处理对甜菜生长和渗透调节物质积累的影响  

Effects of salt treatments on growth and osmoregulatory substance accumulation in sugar beet(Beta vulgaris)

作　　者：伍国强[1] 冯瑞军[1] 李善家[1] 王春梅[2] 焦琦[1] 刘海龙[1] 

机构地区：[1]兰州理工大学生命科学与工程学院,甘肃兰州730050 [2]中国农业科学院兰州畜牧与兽药研究所,甘肃兰州730050

出　　处：《草业学报》2017年第4期169-177,共9页Acta Prataculturae Sinica

基　　金：国家自然科学基金项目(31260294和31460101);兰州市人才创新创业专项(2014-2-6);兰州理工大学"红柳杰出人才"培养计划项目(J201404)资助

摘　　要：采用室内盆栽法,探究了不同浓度NaCl(0、50、100和150 mmol/L)对60 d龄甜菜植株生长及渗透调节物质积累的影响。结果表明,添加50、100和150 mmol/L NaCl明显促进甜菜植株生长,维持良好水分状况。与对照(0mmol/L)相比,不同浓度NaCl均显著增加甜菜叶片、叶柄和贮藏根的鲜重和干重(P<0.05)。高盐(150 mmol/L)条件下,甜菜叶片和叶柄Na^+浓度较对照分别增加4.4和4.9倍(P<0.05),贮藏根和侧根Na+相对分配比例分别降低44%和53%(P<0.05);叶片和侧根K^+浓度分别降低39%和55%(P<0.05),叶柄和贮藏根K^+相对分配比例分别增加35%和80%(P<0.05)。盐处理下贮藏根蔗糖含量降低44%~50%(P<0.05),果糖含量减少31%~36%(P<0.05),而葡萄糖含量维持在稳定水平。另外,高盐使贮藏根的脯氨酸浓度较对照增加93%(P<0.05)。由此可见,甜菜通过叶片和叶柄积累大量Na^+、根部维持K^+的稳态平衡以及提高脯氨酸含量,以适应盐渍生境。In this study,the effects of NaCl at different concentrations（0,50,100 and 150 mmol/L） on the growth and osmoregulatory substance accumulation in 60-day-old sugar beet（Beta vulgaris） plants were investigated in pot experiments.The addition of 50,100,and 150 mmol/L NaCl promoted the growth of sugar beet plants and maintained water conditions well.Compared with the control（0 mmol/L）,various concentrations of NaCl significantly increased the fresh weights and dry weights of the leaf blade,leaf petiole,and storage root of B.vulgaris plants（P〈0.05）.Compared with the control,the high-salt treatment（150 mmol/L） resulted in marked increases in Na＋concentrations in the leaf blade and leaf petiole（4.4- and 4.9-fold,respectively; P〈0.05）,and decreased the relative distribution of Na^＋in storage roots and lateral roots（by 44% and 53%,respectively; P〈0.05）.The high-salt treatment also reduced the K^＋concentrations in the leaf blade and lateral root by 39% and 55%,respectively（P〈0.05）,and increased the relative distribution of K＋in the leaf petiole and storage root by 35% and 80%,respectively（P〈0.05）.The salt treatments reduced sucrose contents by 44%-50%（P〈0.05） and fructose contents in the storage root by 31%-36%（P〈0.05）,whereas glucose contents were unaffected.The high-salt treatment increased the proline concentration in the storage root by 93%,compared with the control（P〈0.05）.These results suggested that sugar beet plants can adapt to saline conditions by accumulating the large quantities of Na^＋in the leaf blade and leaf petiole,by maintaining K^＋homeostasis,and by enhancing the accumulation of proline in storage roots.

关 键 词：甜菜 耐盐性 脯氨酸 可溶性糖 

分 类 号：S566.3[农业科学—作物学]