Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2015, Vol. 23 ›› Issue (5): 997-1001.DOI: 10.11733/j.issn.1007-0435.2015.05.014

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Germination Responses of Different Maturity Leymus chinensis Seeds to Salt Stress in Songnen Grassland

LIN Ji-xiang1, CAO Ming2, QI Ming-ming1, MU Chun-sheng2, WANG Ying3, LIN Li-dong4   

  1. 1. Alkali Soil Natural Environmental Science Center, Northeast Forestry University, Key Laboratory of Saline-alkali Vegetation Ecology Restoration in Oil Field, Ministry of education, Harbin, Heilongjiang Province 150040, China;
    2. Key Laboratory of Vegetation Ecology of Ministry of Education, Institute of Grassland Science, Northeast Normal University, Changchun, Jilin Province 130024, China;
    3. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun, Jilin Province 130118, China;
    4. Dongtou Fisheries Science and Technology Research Institute, Wenzhou, Zhejiang Province 325700, China
  • Received:2015-01-19 Revised:2015-06-19 Online:2015-10-15 Published:2015-12-01

松嫩草地不同成熟度羊草种子对盐胁迫的发芽响应

蔺吉祥1, 曹明2, 齐明明1, 穆春生2, 王颖3, 林立东4   

  1. 1. 东北林业大学盐碱地生物资源环境研究中心东北油田盐碱植被恢复与重建教育部重点实验室, 黑龙江 哈尔滨 150040;
    2. 东北师范大学草地科学研究所植被生态科学教育部重点实验室, 吉林 长春 130024;
    3. 吉林建筑大学松辽流域水环境教育部重点实验室, 吉林 长春 130118;
    4. 洞头县水产科学技术研究所, 浙江 温州 325700
  • 通讯作者: 穆春生
  • 作者简介:蔺吉祥(1985-),男,黑龙江哈尔滨人,讲师,主要从事种子生态学与植物逆境生理学研究,E-mail:linjixiang@nefu.edu.cn
  • 基金资助:

    中央高校基本科研业务费专项资金(2572015CA17)(2572014EA04);国家自然科学基金项目(31502013);黑龙江省自然科学基金项目(C2015060)资助

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Abstract:

Leymus chinensis(Trin.) Tzvel. is a perennial rhizomatous forage grass species of Poaceae, which is also the dominant grass species in Songnen Salt-alkali Grassland of Northern China. Due to the fact that no information existed concerning the germination responses of different maturity Leymus chinensis seeds, four kinds of salt stress concentration(50, 100, 200, 400 mM) were designed here in order to investigated the ecological responses of different maturity Leymus chinensis seeds(24, 29, 34 and 39 days after blooming) on the salt stress. Results showed that the germination responses of Leymus chinensis seeds to salt stress greatly differed from different maturation times. Seeds at 39 days after blooming had the highest vigor and the best quality. The germination percentage, germination energy, recovery percentage and total germination percentage were superior to others. In addition, the germination recovery percentage of the seed before germination treated by salinity stress increases compared with no treated. This may be an adaptive strategy of seed germination to salt stress, being a state of dormancy to escape from the rigorous environment. The research can provide scientific basis for seed development and stress tolerance science.

Key words: Leymus chinensis seed, Maturity, Salt stress, Germination recovery percentage

摘要：

羊草(Leymus chinensis)是多年生根茎型优质禾本科饲草,也是东北松嫩盐碱化草地的建群植物,针对不同成熟度羊草种子对盐胁迫发芽响应在国内外未被涉及的现状,本研究以NaCl为盐胁迫处理液,设置4个胁迫浓度(50, 100, 200和400 mM)研究不同成熟度(盛花期后24, 29, 34和39 d)羊草种子对盐胁迫的发芽响应。结果表明:不同成熟度的羊草种子同样表现出不同的耐盐性,盛花期后39 d的羊草种子活力最大,发芽率、发芽势、复萌率以及总发芽率均优于其余3个发育时期的种子。另外,盐胁迫下未萌发的羊草种子复萌率随着胁迫强度的增加而增加,这是羊草种子对高盐胁迫的生理适应策略,以休眠形式躲避不良环境,待土壤盐浓度降低时萌发出土。本研究可为羊草种子的发育与抗逆生理学等研究提供一定的科学依据。

关键词: 羊草种子, 成熟度, 盐胁迫, 复萌

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