草地学报

草地学报 ›› 2020, Vol. 28 ›› Issue (5): 1329-1336.DOI: 10.11733/j.issn.1007-0435.2020.05.018

• 研究论文 • 上一篇    下一篇

8种山蚂蝗种子萌发期耐盐耐旱性差异分析

罗小燕, 李欣勇, 张瑜, 王文强, 丁西朋   

  1. 中国热带农业科学院热带作物品种资源研究所, 海南 海口, 570100
  • 收稿日期:2020-04-01 修回日期:2020-05-13 出版日期:2020-10-15 发布日期:2020-09-19
  • 通讯作者: 丁西朋
  • 作者简介:罗小燕(1980-),女,汉,助理研究员,主要从事热带牧草种质资源评价与选育研究,E-mail:luoxiaoyan0314@163.com
  • 基金资助:
    国家自然科学基金青年基金项目（31602000）；中国热带农业科学院基本科研业务费专项资金项目（1630032017031、1630032020033和1630032019025）资助

Difference Analysis of Salt and Drought Tolerance of Eight Desmodium Species Seeds During Germination

LUO Xiao-yan, LI Xin-yong, ZHANG Yu, WANG Wen-qiang, DING Xi-peng   

  1. Institute of Tropical Crops Genetic Resources, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan Province 570100, China
  • Received:2020-04-01 Revised:2020-05-13 Online:2020-10-15 Published:2020-09-19

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摘要： 为比较不同山蚂蝗（Desmodium Desv.）种子萌发期耐盐耐旱性差异，本研究选用8种山蚂蝗种子为材料，采用培养皿纸上发芽法观测了NaCl和聚乙二醇（Polyethylene glycol，PEG）处理对其发芽率、发芽势、发芽指数、胚根和胚芽的影响，并探讨了8种山蚂蝗种子在萌发期耐盐耐旱性能差异。结果表明山蚂蝗种子对NaCl胁迫较敏感。当NaCl浓度为50 mmol·L-1时，发芽指数均明显下降；当NaCl浓度为100 mmol·L-1时，胚根和胚芽生长均受到明显抑制；当NaCl浓度≥150 mmol·L-1时，胚根胚芽均不能正常生长，甚至出现腐烂。低浓度的PEG胁迫对山蚂蝗种子发芽无显著影响，但可促进胚根和胚芽生长。在PEG浓度≤15%时，山蚂蝗种子均能正常萌发且生长良好；当PEG浓度为20%时，种子萌发和生长均显著受到抑制；当PEG浓度为25%时，仅糙伏山蚂蝗发芽率为86.00%，其它种子不能萌发。在8种山蚂蝗种子中，山蚂蝗、赤山绿豆和异果山绿豆耐盐性较好，糙伏山蚂蝗和异叶山蚂蝗抗旱能力较强，南美山蚂蝗耐盐性和抗旱均较差。

关键词: 山蚂蝗, 干旱胁迫, NaCl胁迫, 种子萌发, 胚根长, 胚芽长

Abstract: To compare the tolerance to salt and drought of different Desmodium species seeds during germination,the seed germination rate,germination potential,germination index,radical length and plumule length of 8 Desmodium species seeds were measured by the method of paper germination in petri dishes under treatments with NaCl and PEG stress. The results showed that the Desmodium seeds were sensitive to salt during germination. The germination index of all 8 Desmodium species seeds was inhibited by NaCl solution at the concentration of 50 mmol·L-1,and the radical and plumule of them was inhibited at 100 mmol·L-1. When the concentration of NaCl ≥ 150 mmol·L-1,all 8 Desmodium species didn’t grow normally or even decay. PEG solution with low concentrations have no effect on germination of Desmodium seeds,but it could promote the growth of radical and plumule. When the concentration of PEG≤15%,all 8 Desmodium species seeds germinated and grow normally. The seed germination and growth of all 8 Desmodium species were inhibited by PEG solution with the concentration of 20%. Except D. strigillosum with 86.00% germination rate,all other Desmodium species didn’t germinate when the concentration of PEG=25%. Among 8 Desmodium species,D. racemosum and D. heterocarpum have stronger salt tolerance ability,D. strigillosum and D.heterophyllum had stronger drought tolerance ability,and D. tortuosum was most sensitive to salt and drought during germination.

Key words: Desmodium, Drought stress, NaCl stress, Seed germination, Radical length, Plumule length

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