| 干旱和钠盐胁迫对罗布麻种子萌发的影响 |
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| 引用本文： | 刘克彪,姜生秀.干旱和钠盐胁迫对罗布麻种子萌发的影响[J].草业学报,2016,25(5):214-221. |
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| 作者姓名： | 刘克彪 姜生秀 |
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| 作者单位： | 甘肃沙生植物工程技术研究中心,甘肃 兰州,730070;民勤沙生植物园,甘肃 民勤,733300 |
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| 基金项目： | 国家地区自然科学基金(31460223)，甘肃省科技创新信息平台服务建设项目(1306TTPA034)资助。 |
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| 摘 要： | 为探明罗布麻种子在不同水分和钠盐胁迫下的萌发特性,通过模拟盐渍化土壤溶液渗透势和主要阴离子组成,研究罗布麻种子在PEG-6000不同渗透势溶液和不同钠盐(NaCl、Na_2SO_4、NaHCO_3、复合钠盐)溶液中的萌发情况。结果表明,用PEG高渗透势(-0.05 MPa)溶液、低浓度Na_2SO_4(0.2%)和复合钠盐(0.2%~0.6%)溶液处理种子,发芽率、发芽势、发芽指数、萌发抗旱指数CK,平均发芽时间CK,盐害率为负值,发芽高峰期集中于2~4d,溶液对种子发芽具有促进和增效作用,随着溶液渗透势降低和盐浓度的增加,发芽率、发芽势、发芽指数、萌发抗旱指数逐步降低,平均发芽时间延长,盐害率增大,发芽高峰期集中于2~3d。NaCl、NaHCO_3溶液处理种子,随着浓度的增加,发芽率、发芽势、发芽指数有明显降低的趋势,平均发芽时间延迟,发芽高峰期集中于2~3d,渗透胁迫和毒害作用增强,溶液对种子萌发有明显的抑制和延缓作用。PEG、复合盐溶液处理种子,渗透势和浓度的适宜值、临界值与极限值分别为-0.09,-0.70,-1.30 MPa和0.85%,2.04%,3.22%。用相同浓度的钠盐溶液处理种子,盐害率大小总体依次为NaHCO_3NaClNa_2SO_4复合钠盐。
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| 关 键 词： | 罗布麻 干旱胁迫 钠盐胁迫 发芽率 发芽势 发芽指数 平均发芽时间 萌发抗旱指数 相对盐害率 |
| 收稿时间： | 2015-06-25 |
Responses of Apoceynum venetum seed germination to drought and salt stress |
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| LIU Ke-Biao,JIANG Sheng-Xiu.Responses of Apoceynum venetum seed germination to drought and salt stress[J].Acta Prataculturae Sinica,2016,25(5):214-221. |
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| Authors: | LIU Ke-Biao JIANG Sheng-Xiu |
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| Abstract: | In order to study the seed germination characteristics of Apoceynum venetum under different stresses of drought and sodium salt,germination was tested with four different osmotic potential and sodium salt solu-tions (NaCl,Na2 SO4 ,NaHCO3 ,compound sodium salt).The results showed that when seeds were treated with the PEG high osmotic potential (-0.05 MPa),low concentration of Na2 SO4 (0.2%)and the compound salt solutions (0.2% to 0.6%),the germination rate,index and drought index were more than CK,the aver-age germination times were less than CK and salt damage rate was a negative value.Germination peak was in 2-4 d.The solutions promoted seed germination according to decreasing osmotic potential and increasing salt concentration.The germination potential,rate,index,and drought index gradually reduced,average germina-tion time extended and salt damage rate increased,with germination peak at 2 -3 d.When treated with the NaCl and NaHCO3 solutions,increasing concentrations caused the germination rate,potential and index to sig-nificantly decrease.The average germination time was delayed,germination peak was in 2-3 d,seed germina-tion penetration and toxic effects were enhanced.When treated with the PEG and compound salt solutions,the appropriate value,critical value and limit value of osmotic potential and concentration was -0.09,-0.70,-1.30 MPa and 0.85%,2.04%,3.22% respectively.When treated with the same concentration of salt solu-tion,the salt injury rate was NaHCO3 >NaCl>Na2 SO4 >compound salt. |
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| Keywords: | Apoceynum venetum water stress sodium salt stress germination rate germination potential germination index mean germination time germination index of drought resistance relative salt damage rate |
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