摘要
为揭示黄花菜对盐胁迫的生理响应,采用砂培浇灌营养液方法,研究了等浓度NaCl和Ca(NO3)2混合盐胁迫下大同黄花菜生长和一些生理指标的变化。结果表明,随盐胁迫浓度提高(0~250 mmol/L),处理后20 d时,黄花菜各形态指标、生物量和叶片含水量明显降低,根系含水量相对稳定,200、250 mmol/L盐胁迫下有植株死亡;随混合盐胁迫浓度提高,质膜透性、脯氨酸含量在不同处理时间均显著增加,抗坏血酸含量在处理5 d时逐渐降低,处理10 d后出现增加—降低的趋势,可溶性糖含量在处理5 d时逐渐降低,处理10 d后显著降低,可溶性蛋白含量基本不变。表明混合盐胁迫造成黄花菜植株膜脂过氧化加剧,地上部水分亏缺,使植株生长严重受抑,但是黄花菜耐盐性较强,可通过促进抗氧化物质和有机渗调物质合成来减轻盐胁迫伤害。黄花菜植株在150 mmol/L混合盐胁迫下仍可正常生长,超过该浓度,植株生命受到威胁,200 mmol/L是黄花菜的致死盐浓度。
To reveal the physiological response of daylily plant to salinity,the experiment studied the change of growth and some physiological indicators of Datong daylily under the mixed salt stress of isoconcentration of NaCl and Ca(NO 3)2 in sand culture by irrigating the nurtrient solution.The results showed that the morphological indexes,biomass and leaf water content of daylily decreased obviously,root water content was relatively stable with the increase of salt concentration(0—250 mmol/L),and some plants were dead under 200 and 250 mmol/L mixed salt stress on the 20th day after treatment.With the increase of salt concentration,the plasma membrane permeability and proline content increased significantly during treatment,the AsA content decreased gradually on the 5th day of treatment,and showed the change of increase-decrease after 10 d.The content of soluble sugar decreased gradually on the 5th day of treatment,decreased significantly after 10 d,while the content of soluble protein was almost unchanged.The research illustrated that the membrane lipid peroxidation aggravated,and the water content in the aerial part decreased under mixed salt stress,which inhibited the growth of daylily plant.But the salt tolerance of daylily plant was strong,and the damage caused by salt stress could be partly alleviated by promoting the synthesis of antioxidants and organic osmolytes.Daylily could still grow normally under 150 mmol/L mixed salt stress,and the plant life was threatened beyond this concentration,and 200 mmol/L was the lethal salt concentration for daylily.
作者
韩志平
张海霞
周桂伶
李侠
HAN Zhiping;ZHANG Haixia;ZHOU Guiling;LI Xia(School of Life Science/Protected Agricultural Technology Development Center,Shanxi Datong University,Datong 037009,China;Department of Rear-service,Shanxi Datong University,Datong 037009,China)
出处
《河南农业科学》
北大核心
2020年第2期116-122,共7页
Journal of Henan Agricultural Sciences
基金
山西省农业科技攻关项目(20150311010-1)
大同市农业科技攻关项目(201468-2)
关键词
黄花菜
混合盐胁迫
膜脂过氧化
渗透调节
Daylily
Mixed salt stress
Lipid peroxidation
Osmotic adjustment
