硅对盐胁迫下藜麦幼苗生长及抗氧化酶活性的影响  

Effect of Silica on Growth and Antioxidant Enzyme Activity of Quinoa Under Salt Stress

作　　者：武子璇 王欣 张永超 钟明月 封洪雨 李妍 WU Zixuan;WANG Xin;ZHANG Yongchao;ZHONG Mingyue;FENG Hongyu;LI Yan(College of Life Science,Dezhou University,Dezhou Shandong 253023;Ningjin County Bureau of Agriculture and Rural Affairs,Ningjin Shandong 253400)

机构地区：[1]德州学院生命科学学院,山东德州253023 [2]宁津县农业农村局,山东宁津253400

出　　处：《现代农业科技》2024年第11期1-6,共6页Modern Agricultural Science and Technology

基　　金：大学生创新创业计划项目(S202310448048);德州学院实验教学改革项目(SYJS23004)。

摘　　要：全球气候变暖,降水减少,加速了土壤盐渍化进程,对农业生产造成了严重影响。盐含量低的土壤对藜麦生长发育没有明显影响,但盐含量较高的土壤则不利于藜麦生长。前人研究表明,硅有助于植物在盐胁迫条件下较好的生长。本试验以4个藜麦品种为研究材料,在NaCl浓度为300 mmol/L盐胁迫条件下设置不同硅浓度梯度(0、0.5、1.0、1.5、2.0 mmol/L),研究硅对盐胁迫条件下藜麦幼苗生长的影响及其生理机制,为提高藜麦耐盐性提供参考。结果表明:与对照无盐胁迫且无硅处理相比,盐胁迫(未添加硅处理)条件下各品种藜麦幼苗的芽长均有所降低,根长均显著增加,超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)等抗氧化酶活性有不同程度的增加,可溶性糖(SS)含量降低,超氧阴离子自由基(O_(2)^(-)·)产生速率及丙二醛(MDA)含量增加。在盐胁迫条件下,随硅浓度的增加,藜麦幼苗的芽长、根长、SOD、POD、CAT、SS各品种均大致表现为先增加后降低的趋势,O_(2)^(-)·产生速率和MDA含量各品种表现先降低后升高。添加适当浓度的外源硅提高了盐胁迫条件下藜麦幼苗的抗氧化酶活性和SS含量,降低了O_(2)^(-)·产生速率和MDA含量,促进了藜麦幼苗在盐胁迫条件下的生长,各指标以硅浓度为0.5 mmol/L或1.0 mmol/L时效果较好。Global climate change and reduced precipitation have accelerated the process of soil salinization,causing serious impacts on agricultural production.Soil with low salt content has no significant effect on the growth and development of quinoa,but soil with high salt content is not conducive to the growth of quinoa.Previous studies showed that silicon could help plants grow better under salt stress conditions.This experiment used four varieties of quinoa as research materials,and set different silicon concentration gradients(0,0.5,1.0,1.5,2.0 mmol/L)under salt stress conditions of 300 mmol/L NaCl to study the effect of silicon on the growth of quinoa seedlings under salt stress conditions and its physiological mechanisms,so as to provide references for improving salt tolerance of quinoa.The results showed that compared with the control without salt stress and silicon treatment,the shoot length of all varieties of quinoa seedlings decreased and the root length significantly increased under salt stress(without silicon treatment).The activities of antioxidant enzymes such as superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)increased to varying degrees,and the content of soluble sugars(SS)decreased,the production rate of superoxide anion free radicals(O_(2)^(-)·)and the content of malondialdehyde(MDA)increased.Under salt stress conditions,with the increase of silicon concentration,the shoot length,root length,SOD,POD,CAT,and SS of quinoa seedlings roughly showed a trend of first increasing and then decreasing,while the O_(2)^(-)·production rate and MDA content of each variety showed a trend of first decreasing and then increasing.Under salt stress conditions,adding appropriate concentrations of exogenous silicon increased the antioxidant enzyme activity and SS content of quinoa seedlings reduced the production rate of O_(2)^(-)·and MDA content,and promoted the growth of quinoa seedlings.Among them,the better effect was achieved in each index with a silicon concentration of 0.5 mmol/L or 1.0 mmol/L.

关 键 词：藜麦 硅 盐胁迫 幼苗生长 抗氧化酶活性 

分 类 号：S519[农业科学—作物学]