摘要
为提高向日葵幼苗的耐盐碱性,以向日葵品种SH361为材料,采用叶面喷施的方法,研究盐碱胁迫下不同浓度(0.5、1.0、1.5 mmol·L^(-1))亚精胺对向日葵幼苗生长和生理特性的影响。结果表明,盐碱胁迫显著抑制了向日葵幼苗的生长,丙二醛比对照含量升高77.8%,相对电导率增加至对照的2.6倍,向日葵幼苗通过增加渗透调节物质和提高抗氧化酶活性以适应盐碱胁迫环境;叶面喷施外源亚精胺,则显著提高向日葵幼苗对盐碱胁迫的抗性,其中亚精胺浓度为1.0 mmol·L^(-1)时效果最明显,向日葵幼苗的生长指标及生物量增长显著,对渗透调节物质含量的提高以及对细胞脂膜损伤的降低,效果均达30%以上,SOD、POD和CAT活性也分别提升1.7倍、1.4倍和1.3倍。由此认为,适宜浓度的亚精胺可通过提高生理水平的抗逆性来提高向日葵幼苗的耐盐碱能力,从而有效缓解盐碱胁迫对幼苗生长的抑制作用。
In order to improve salt-alkali tolerance for sunflower at seedling stage,cultivar SH361 was used as material to study the effect of spermidine on growth and physiological characteristics of sunflower seedlings under saline-alkali stress by spraying different concentrations of spermidine(0.5,1.0,and 1.5 mmol·L^(-1)).Results showed that salt-alkali stress significantly inhibited seedling growth.Malondialdehyde content increased 77.8%and relative conductivity increased 2.6 times.Sunflower seedlings adapted to salt-alkali stress by increasing osmotic regulatory substances and antioxidant enzyme activities.Spraying spermidine significantly improved seedlings tolerance to sa-line-alkali.1.0 mmol·L^(-1) spermidine had the most obvious effect.Plant growth index and biomass increased remark-able.It increased content of osmotic regulation substances and reduced damage of lipid membrane by more than 30%.Furthermore,activities of SOD,POD and CAT increased 1.7,1.4 and 1.3 times respectively.It indicated that appropriate concentration of spermidine promoted salt-alkali tolerance of sunflower seedlings at physiological level,which effectively alleviated inhibition by salt-alkali stress on sunflower seedling.
作者
武悦
单飞彪
李军
米志蓉
韩杰
陈阳
WU Yue;SHAN Fei-biao;LI Jun;MI Zhi-rong;HAN Jie;CHEN Yang(Agriculture Department,Hetao College,Bayannur 015000,China;Bayannur Institute of Agricultural and Animal Sciences,Bayannur 015000,China)
出处
《中国油料作物学报》
CAS
CSCD
北大核心
2023年第3期567-573,共7页
Chinese Journal of Oil Crop Sciences
基金
巴彦淖尔市农牧业科学研究所青年创新课题(2021QNCX-01)
国家特色油料产业技术体系(CARS-14-2-08)。
关键词
向日葵
盐碱胁迫
亚精胺
生长
生理指标
sunflower
saline-alkali stress
spermidine
growth
physiological index
