摘要
探究不同干旱程度对藜麦种子萌发及幼苗生长的影响。以藜麦GE 6为材料,采用不同PEG-6000浓度(0、5%、10%、15%、20%)对藜麦种子和幼苗进行处理。结果表明:随着PEG浓度的升高,藜麦种子的发芽率、发芽势、发芽指数、胚根长呈先升后降的趋势,胚根长于5%PEG浓度时达到最高,其它指标均于10%PEG浓度处理时达到最高。幼苗叶片相对含水量和物质的积累随着PEG浓度升高而降低;幼苗可溶性糖、可溶性蛋白的含量随着PEG浓度的升高呈先升后降的趋势,二者含量均于10%PEG浓度时达到最高;幼苗叶片中MDA含量呈降低—上升—降低的趋势,5%PEG处理下MDA含量最低,较对照低11.2%(p>0.05)。SOD和POD的活性随着PEG浓度升高而升高。一定程度的干旱胁迫可以促进藜麦种子的萌发,藜麦幼苗具有一定抗旱能力与其在干旱胁迫下能够合成更多的可溶性糖、可溶性蛋白及较高的POD活性、SOD活性有关。
To explore the effects of different drought degree on the seed germination and seedling growth of Quinoa,the Quinoa varity‘GE 6’was used as experimental material to investigate seed germination and seedling growth under treatments with different PEG-6000 concentrations(0,5%,10%,15%,20%).The results showed that the germination rate,germination potential,germination index and radicle length of Quinoa seeds increased first and then decreased with the increase of PEG concentration.And the radicles reached the longest when growed in 5%PEG concentration,while the other indexes reached the highest when the PEG concentration was 10%.The relative water content and substance accumulation of seedling leaves decreased with the increase of PEG concentration,while the content of soluble sugar and soluble protein in seedlings showed a trend of first increasing and then decreasing with the increase of PEG concentration,and the content of both of them reached the highest when the PEG concentration was above 10%.Malondialdehyde(MDA)content in seedling leaves showed a trend of decreasing,increasing and decreasing.MDA content under 5%PEG treatment was the lowest,which it was 11.2%lower than that under control(p>0.05).Additionally,The activity of superoxide dismutase(SOD)and peroxidase(POD)increased with PEG concentration.The above results indicated that drought stress to a certain extent could promote the germination of Quinoa seeds,and the drought resistance of Quinoa seedlings was related to their ability to synthesize more soluble sugars,soluble proteins and higher POD and SOD activities under drought stress.
作者
杨利艳
杨小兰
朱满喜
杨雅舒
王创云
YANG Liyan;YANG Xiaolan;ZHU Manxi;YANG Yashu;WANG Chuangyun(College of Life Science,Shanxi Normal University,Linfen Shanxi 041004,China;Institute of Crop Sciences,Shanxi Academy of Agricultural Sciences,Taiyuan 030031,China)
出处
《种子》
北大核心
2020年第9期36-40,共5页
Seed
基金
山西省自然基金面上项目(201901D111285)
院士工作站专项资助项目(20190423)。
关键词
藜麦
干旱
萌发
生理特性
quinoa
drought stress
seed germination
physiological characteristics
