摘要
本试验采用水培法研究两个藜麦品种(晋藜1号和晋藜2号)幼苗根系对干旱胁迫的响应机制,通过PEG-6000模拟干旱胁迫设定不同浓度(5%、10%)和不同处理时间(3、6、9 d)对藜麦幼苗根系形态指标及超氧化物歧化酶(SOD)、过氧化物酶(POD)活性以及丙二醛(MDA)含量进行测定,旨在为藜麦的抗逆性机制研究及开发利用提供一定的理论依据。结果表明,与未进行干旱胁迫处理(对照)相比,晋藜1号在同一胁迫浓度下,随着胁迫时间的延长,根系的长度、平均直径、体积、表面积、投影面积、根尖数和SOD活性、POD活性均呈增长趋势;同一胁迫时间下,5%和10%胁迫浓度下根系形态各指标值均显著高于对照,5%胁迫浓度下达到最高值,SOD活性、POD活性则随着胁迫浓度的增大而增大,MDA含量则在5%胁迫浓度下达到最低。晋藜2号在同一胁迫浓度下,根系各项形态指标会随着胁迫时间的延长而呈现增长趋势,SOD活性和POD活性在5%胁迫浓度下呈现逐渐增长趋势,但在10%胁迫浓度下则呈现先增后降趋势,MDA含量呈现逐渐升高趋势;同一胁迫时间下,与对照相比,5%胁迫浓度下根系形态各指标值均显著高于对照,10%胁迫浓度下根平均直径和根尖数高于对照,但其他指标均低于对照,SOD活性和POD活性则随着胁迫浓度的增大呈现先增后降趋势,MDA含量则在5%胁迫浓度下达到最低。可见,晋藜1号和晋藜2号根系通过形态和生理指标变化均能抵御一定的干旱胁迫,但晋藜1号较晋藜2号更抗旱。
This experiment used hydroponic method to study the response mechanism of seedling roots of two quinoa varieties(Jinli 1 and Jinli 2)to drought stress.Different concentrations(5%,10%)and treatment times(3,6,9 d)of PEG-6000 were set to simulate drought stress,and the root morphology indicators of quinoa seedlings were determined,as well as the superoxide dismutase(SOD)and peroxidase(POD)activity,and malondialdehyde(MDA)content,so as to provide a theoretical basis for the research and development of stress resistance mechanisms in quinoa.The results showed that compared with the control(without drought stress treatment),under the same stress concentration,the length,average diameter,volume,surface area,projection area,number of root tips,SOD activity,and POD activity of the root system of Jinli 1 all showed an increasing trend with the prolongation of stress time;under the same stress time,the values of various indicators of root morphology were significantly higher at 5%and 10%stress concentrations than those of control,and the value reached the highest at 5%stress concentration.The SOD and POD activities increased with the increase of stress concentration,and MDA content reached the lowest at 5%stress concentration.Under the same stress concentration,the various morphological indicators of the root system of Jinli 2 showed an increasing trend with the prolongation of stress time.SOD activity and POD activity showed a gradually increasing trend at a stress concentration of 5%,but a trend of first increasing and then decreasing at a stress concentration of 10%,and MDA content showed a gradually increasing trend.Under the same stress time,compared with the control,the values of various indicators of root morphology were significantly higher under 5%stress concentration,and the average root diameter and number of root tips were higher under 10%stress concentration.However,other indicators were lower than the control.The SOD activity and POD activity showed a trend of first increasing and then decreasing with the incr
作者
姚天姿
赵子祎
秦曹瑜
郅妍卿
杨璐杰
赵红梅
YAO Tianzi;ZHAO Ziyi;QIN Caoyu;ZHI Yanqing;YANG Lujie;ZHAO Hongmei(Jinzhong University,Yuci Shanxi 030600)
出处
《现代农业科技》
2024年第7期37-41,46,共6页
Modern Agricultural Science and Technology
基金
山西省高新科技创新项目(2019L0884)
黄土高原特色作物优质高效生产省部共建协同创新中心成果项目(SBGJXTZX-43)。
关键词
藜麦
干旱胁迫
根系形态特征
生理特性
quinoa
drought stress
root morphology characteristic
physiological characteristic
