不同温度条件下水分和盐分胁迫对画眉草种子萌发的影响  

Effects of water stress and salt stress on seed germi⁃nation of Eragrostis pilosa under different temperature regimes

作　　者：万琪[1] 叶耘伶 唐丽 黄伟 纪佳怡 冯亚亭 骆凯 张瑞[1] WAN Qi;YE Yun-ling;TANG Li;HUANG Wei;JI Jia-yi;Feng Ya-ting;LUO Kai;ZHANG Rui(School of Tropical Crops,Hainan University,Haikou 570228,China;Hainan University Archives,Haikou 570228,China)

机构地区：[1]海南大学热带作物学院,海南海口570228 [2]海南大学档案馆,海南海口570228

出　　处：《草原与草坪》2022年第3期154-159,共6页Grassland and Turf

基　　金：海南大学科研启动基金项目[KYQD(ZR)1965、KYQD(ZR)1966]。

摘　　要：以画眉草(Eragrostis pilosa)为试验材料,探究不同温度条件下(25、30、35、40℃)种子萌发对水分和盐分胁迫的响应,并利用水势模型比较不同温度条件下种子萌发所需的基础水势。结果表明:除温度与盐分互作对画眉草种子萌发率无显著(P>0.05)影响外,温度、水分/盐分及两者互作均极显著(P<0.01)影响画眉草种子的萌发率和萌发速率;不同水分和盐分条件下,25℃抑制画眉草种子萌发,而40℃虽能促进种子萌发,但却抑制其幼苗生长;画眉草种子萌发的基础水势值随温度升高呈先降低后升高的趋势,其中水分胁迫条件下,30℃时种子萌发的基础水势最低,为-0.75 MPa;盐分胁迫条件下,35℃时种子萌发的基础水势最低,为-0.78 MPa。表明适宜的高温能够降低画眉草种子萌发对水分的需求,更有利于其在干旱、盐碱地萌发和建植。We quantified the effect of water stress and salt stress on seed germination of Eragrostis pilosa under different temperature regimes(25,30,35 and 40℃).The hydrotime model was used to compare the base water potential for seed germination under different temperature regimes.The results showed that:1)Besides the interaction of temperature and salt stress had no significant(P>0.05)effect on germination percentage,temperature,water stress/salt stress and their interaction all had significant(P<0.01)effects on germination percentage and rate;2)Seed germination was inhibited at 25℃,and promoted at 40℃;whereas 40℃inhibited seedling growth under different water stress/salt stress;3)As temperature increasing,the base water potential for seed germination decreased first and then increased.The lowest base water potential was obtained at 30℃under-0.75 MPa for water stress.Under-0.78 MPa for salt stress,the lowest was obtained at 35℃.Our results indicated that suitable high temperature could reduce the water potential requirement for seed germination of E.pilosa,that will be easier to establish in the arid and saline‐alkali land.

关 键 词：画眉草 温度 水分 盐分 种子萌发 

分 类 号：S543[农业科学—作物学]