低浓度NaCl对高粱生长的影响

Effect of NaCl at Low Concentration on Growth of Sorghum

[目的]探究低浓度NaCl对高粱生长的效应。[方法]以非盐生C4植物高粱为材料,以Hoagland溶液为基础培养液,用NaCl3种浓度(5、10、20mmol/L)处理高粱苗,采用沙培法研究低浓度NaCl对高粱生长的影响。[结果]从长势上看,NaCl低浓度(5mmol/L)处理的植株长势要优于对照,NaCl中浓度(10mmol/L)处理的植株长势与对照相近或比对照略差,NaCl高浓度(20mmol/L)处理的植株长势明显比对照差。3种浓度处理中以低浓度NaCl促进高粱生长的效果最佳,主要表现在:与对照相比,高粱的根系活力增加16.2%(P<0.05);植株叶绿素a、叶绿素b和叶绿素总量分别增加9.4%(P<0.01)、7.9%(P<0.05)和9.0%(P<0.05);高粱叶中可溶性蛋白含量增加22.9%(P<0.05);高粱的鲜重和干重分别增加23.2%(P<0.01)和17.5%(P<0.05)。[结论]低浓度NaCl可以促进高粱生长。

[Objective] The study aimed to explore the effect of NaCl at low concn.on the growth of sorghum.[Method] With non-halophytes C4 plant sorghum as the material and Hoagland solution as the basic cultural liquid,the seedlings of sorghum were treated with NaCl at 3 kinds of concn.（5,10,20 mmol/L）and the effects of NaCl at low concn.on the growth of sorghum were studied by using sand culture method.[Result] From the view of sorghum growth vigor,the sorghum plant treated with NaCl at low concn.（5 mmol/L）was better than CK,that with NaCl at middle concn.（10 mmol/L）was close to CK or was slightly poor than CK and that with NaCl at high concn.（20 mmol/L）was obviously poor than CK.Among 3 kinds of concn.,the treatment with NaCl at low concn.could get optimum effect of promoting the growth of sorghum.Its performance was mainly as follows：compared with CK,the sorghum root activity was increased by 16.2%（P0.05）;plant chlorophyll a,chlorophyll b and the total chlorophyll quantity were increased by 9.4%（P0.01）,7.9（P0.05）% and 9.0%（P0.05）resp.;the soluble protein content in the sorghum leaf was increased by 22.9%（P0.05）;the sorghum fresh weight and the dry weight was increased by 23.2%（P0.01）and 17.5%（P0.05）resp.[Conclusion] NaCl at low concn.can promote the sorghum growth.