| 盐胁迫对醉马草和高羊茅种子萌发及幼苗生长的影响 |
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| 引用本文： | 陈雅琦,苏楷淇,李春杰.盐胁迫对醉马草和高羊茅种子萌发及幼苗生长的影响[J].草业科学,2022,38(5):870-879. |
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| 作者姓名： | 陈雅琦 苏楷淇 李春杰 |
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| 作者单位： | 兰州大学草地农业生态系统国家重点实验室 / 兰州大学农业部草牧业创新重点实验室 / 兰州大学草地农业教育部工程研究中心 /兰州大学甘肃省西部草业技术创新中心 / 兰州大学草地农业科技学院,甘肃 兰州 730020 |
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| 基金项目： | 国家973项目(2014CB138702)%长江学者和创新团队发展计划(IRT-17R50)%国家自然科学基金(30070546)%中央高校基本科研业务费(LZUJBKY-2019-kb10)%111引智基地(B12002) |
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| 摘 要： | 采用质量分数分别为0.1％、0.3％、0.5％、0.7％和0.9％的盐溶液处理带内生真菌醉马草(Achnatherum inebrians)、不带内生真菌醉马草、高羊茅(Festuca arundinacea)品种'侠客岛'(Island)和'猎狗6号'(Hound 6)种子,测定发芽率、发芽势、活力指数、苗高、胚根长等指标,并建立相关函数方程确定4份种质材料对NaCl的耐受值,探讨单盐NaCl对4份种质材料种子萌发和幼苗生长的特性,明确种子萌发阶段及幼苗生长阶段对单盐NaCl胁迫的耐受程度并进行综合耐盐性评价.结果表明,与对照组相比,高羊茅品种'侠客岛'和'猎狗6号'的发芽率、发芽势、发芽指数、活力指数、苗高、胚根长随着盐浓度的升高而降低,根冠比则与之相反.轻度盐胁迫(0.1％和0.3％)对于两种醉马草种子萌发和幼苗生长等有促进作用(P<0.05).种子萌发阶段的带菌醉马草、不带菌醉马草、'侠客岛'和'猎狗6号'的耐盐适宜浓度分别为0.70％、0.60％、0.37％和0.49％;耐盐半致死浓度分别为0.98％、0.72％、0.46％和0.61％;耐盐极限浓度分别为1.02％、0.91％、0.61％和0.87％.幼苗阶段的带菌醉马草、不带菌醉马草、'侠客岛'和'猎狗6号'的耐盐阈值分别为1.23％、1.01％、0.44％和1.09％.综合耐盐性为带菌醉马草>高羊茅'猎狗6号'>不带菌醉马草>高羊茅'侠客岛'.
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| 关 键 词： | NaCl 耐盐性 活力指数 耐盐阈值 醉马草 高羊茅 内生真菌 |
Effects of NaCl stress on seed germination and seedling growth of two cold-season grasses |
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| CHEN Yaqi,SU Kaiqi,LI Chunjie.Effects of NaCl stress on seed germination and seedling growth of two cold-season grasses[J].Pratacultural Science,2022,38(5):870-879. |
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| Authors: | CHEN Yaqi SU Kaiqi LI Chunjie |
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| Abstract: | This study investigated the effects of NaCl on seed germination and seedling growth of infected Achnatherum inebrians and non-infected A. inebrians, Festuca arundinacea ‘Island’, and F. arundinacea ‘Hound 6’, to determine the tolerance level of single salt NaCl stress at seed germination stage and seedling growth stage and to conduct a comprehensive salt tolerance evaluation. In endophyte-infected A. inebrians and non-endophyte-infected A. inebrians, ‘Island’, and ‘Hound 6’ as the experimental material, the mass fractions of 0.1%, 0.3%, 0.5%, 0.7%, and 0.9% of the salt solution were used to process seeds, and germination rate, germination potential, vigor index and seedling height, and radicle length index, were measured to establish the related function equation to determine the tolerance values of four kinds of germplasms planted under saline conditions. The results showed that, compared with the control group, the germination rate, germination power, germination index, vigor index, seedling height, and radicle length decreased with increasing salt concentrations, whereas the root-cap ratio showed the opposite trend. Mild salt stress (0.1% and 0.3%) had a positive effect on seed germination and seedling growth (P < 0.05). In the germination stage, the appropriate salt tolerance concentrations of E + A. inebrians, E – A. inebrians, ‘Island’, and ‘Hound 6’ were 0.70%, 0.60%, 0.37%, and 0.49%, respectively. The salt-tolerance semi-lethal concentrations were 0.98%, 0.72%, 0.46%, and 0.61%, respectively, and the salt tolerance limit concentrations were 1.02%, 0.91%, 0.62%, and 0.87%, respectively. In the seedling stage, the salt tolerance thresholds of E + A. inebrians, E – A. inebrians, ‘Island’, and ‘Hound 6’ were 1.23%, 1.01%, 0.44%, and 1.09%, respectively. The comprehensive salt tolerance levels were; E + A. inebrians > F. arundinacea‘Hound 6’ > E – A. inebrians > F. arundinacea ‘Island’. |
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| Keywords: | NaCl salt resistance vitality index salt threshold Achnatherum inebrians Festuca arundinacea endophytic fungi |
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