摘要
本研究以盐生植物盐生草为材料,以不同浓度的PEG-6000模拟干旱胁迫和以不同浓度的4种钠盐(NaCl、Na 2SO 4、NaHCO 3、Na 2CO 3)进行盐胁迫,探讨其对盐生草种子萌发特性的影响。结果表明:随着PEG-6000浓度的升高,盐生草种子发芽率、发芽势呈现下降的趋势,幼苗鲜重、干重、株高以及根系活力均呈现先上升后下降的趋势。聚类分析和主成分分析结果显示,以6%PEG-6000为结点,将不同浓度PEG-6000处理聚为两类,鲜重可被首选为评价盐生草萌发期耐干旱的重要参数;随着4种钠盐处理浓度的升高,发芽率、发芽势、幼苗鲜重、干重、株高以及根系活力均呈现不同程度的下降趋势,表明盐胁迫对种子的萌发以及幼苗的生长均有抑制作用,当Na+浓度相同时,4种钠盐对盐生草种子萌发及幼苗生长的抑制作用大小为Na 2CO 3>NaHCO 3>NaCl>Na 2SO 4,聚类分析和主成分分析结果显示,以50.00 mmol·L-1 NaHCO 3,62.50 mmol·L-1 Na 2SO 4,25.00 mmol·L-1 Na 2CO 3和100.00 mmol·L-1 NaCl为结点,将各钠盐胁迫浓度聚为两类,其中发芽指标可被首选为评价盐生草萌发期耐NaHCO 3、Na 2SO 4的重要参数,根系活力可被首选为评价盐生草萌发期耐Na 2CO 3的重要参数,干重可被首选为评价盐生草萌发期耐NaCl的重要参数。
To explore the effects of drought and salt stress on germination characteristics of halophytes,this study simulated drought stress with different concentrations of PEG-6000 and four sodium salts(NaCl,Na 2SO 4,NaHCO 3,Na 2CO 3)to evaluate the effects of those treatments on the seed germination characteristics of Halogeton glomeratus.It was found the germination percentage and germination energy decreased with increasing PEG-6000 concentration,while the seedling fresh weight,dry weight,plant height and root activity initially increased and then decreased at higher PEG-6000 concentration.Cluster analysis and principal component analysis showed that the different PEG-6000 concentrations could be divided into two groups with 6%PEG-6000 as the point of separation.Fresh weight appeared to be an important parameter.In addition,germination percentage germination energy,seedling fresh weight,dry weight,plant height and root activity declined with increase in concentration of the four sodium salts.This indicated that salt stress inhibited seed germination and seedling growth,with the effects of the four tested sodium salts ranked:Na 2CO 3>NaHCO 3>NaCl>Na 2SO 4.Cluster analysis and principal component analysis showed that the sodium salt concentrations were divided into two groups with the separation points falling at 50.00 mmol·L-1 NaHCO 3,62.50 mmol·L-1 Na 2SO 4,25.00 mmol·L-1 Na 2CO 3 and 100.00 mmol·L-1 NaCl.Among the plant traits evaluated as indicators of H.glomeratus stress tolerance in the germination stage,the germination index was the key indicator of NaHCO 3 and Na 2SO 4 stress,root activity emerged as the primary indicator of Na 2CO 3 stress and dry weight was the major indicator of NaCl stress in H.glomeratus.
作者
何建军
姚立蓉
汪军成
边秀秀
司二静
杨轲
王化俊
马小乐
李葆春
尚勋武
孟亚雄
HE Jian-jun;YAO Li-rong;WANG Jun-cheng;BIAN Xiu-xiu;SI Er-jing;YANG Ke;WANG Hua-jun;MA Xiao-le;LI Bao-chun;SHANG Xun-wu;MENG Ya-xiong(College of Agronomy,Gansu Agricultural University,Lanzhou 730070,China;Gansu Provincial Key Lab of Aridland Crop Science,Gansu Provincial Key Lab of Crop Improvement&Germplasm Enhancement,Lanzhou 730070,China;College of Life Sciences and Technology,Gansu Agricultural University,Lanzhou 730070,China)
出处
《草业学报》
CSCD
北大核心
2020年第11期129-140,共12页
Acta Prataculturae Sinica
基金
学科建设专项基金(GAU-XKJS-2018-082、083)
国家大麦青稞产业技术体系(CARS-05-03B-03)
甘肃省重大专项(17ZD2NA016)
盛彤笙创新基金(GSAU-STS-2018-33)资助。
关键词
盐生草
盐胁迫
干旱胁迫
萌发期
Halogen glomeratus
salt stress
drought stress
germination
