| 温度及盐胁迫对7个野生观赏草种子萌发特性的影响 |
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| 引用本文： | 雷舒涵,许蕾,白小明.温度及盐胁迫对7个野生观赏草种子萌发特性的影响[J].草原与草坪,2017,37(2). |
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| 作者姓名： | 雷舒涵 许蕾 白小明 |
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| 作者单位： | 甘肃农业大学 草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业 可持续发展研究中心,甘肃 兰州,730070 |
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| 基金项目： | 甘肃省高等学校基本科研业务费专项资金资助 |
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| 摘 要： | 以甘肃地区采集的7个野生观赏草种子为试验材料,设6个恒温及7个不同浓度NaCl溶液处理,研究了温度及盐胁迫对其种子萌发特性的影响,以期为野生观赏草引种驯化和繁殖提供依据。结果表明:10~35℃恒温范围内,7个材料种子最适发芽温度为发草(天祝)、发草(渭源)和芨芨草(武威)为25℃,狼尾草(宁县)、芨芨草(兰州)和书带苔草(渭源)为20~25℃,云雾苔草(渭源)为20~30℃。NaCl溶液浓度在0~1.1%内,7个野生观赏草种子萌发的发芽率、发芽指数、发芽势、胚芽和根长、鲜苗重均随NaCl浓度的增加而下降。在0.7%NaCl重度胁迫下,7个野生观赏草种子的发芽率、发芽指数、发芽势、胚芽和根长、鲜苗重6个指标显著低于对照(P0.05)。NaCl溶液浓度为0.9%时除狼尾草(宁县)和发草(天祝)种子可以萌发外,其余材料种子未萌发。用发芽率、发芽指数、胚芽和胚根长、幼苗鲜重6个指标的相对值作为7个野生观赏草种子萌发期耐盐性综合评价值,7个野生观赏草种子萌发期耐盐性强弱依次为:狼尾草(宁县)发草(渭源)发草(天祝)芨芨草(武威)芨芨草(兰州)书带苔草(渭源)云雾苔草(渭源)。
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| 关 键 词： | 野生观赏草 温度 盐胁迫 种子萌发 综合评价 |
Effect of temperature and salt stresses on germination of 7 wild ornamental grasses |
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| Abstract: | The seeds of 7 wild ornamental grasses were collected from Gansu Province and the germination characteristics were studied under temperatures and salt stresses (6 constant temperature treatments,7 concentrations of NaCl treatments) in order to provide a basis of wild ornamental grass domestication and further breeding.The results showed that the optimum germination temperature was 25℃ for Deschampsia caespitosa (Tianzhu and Weiyuan),Achnatherum splendens (Wuwei) were;and 20 to 25℃ for Pennisetum alopecuroides (Ningxian),Achnatherum splendens (Lanzhou) and Carex nubigena (Weiyuan);20 to 30℃ for Carex rochebruni (Weiyuan).Along with the increase of NaCl concentration (from 0 to 1.1%),the seed germination rate,germination index,germination potential,embryo and root length,fresh weight of 7 wild ornamental grasses decreased.And they were significantly lower than CK (P<0.05) under 0.7% NaCl stress.In 0.9% NaCl treatment,only P.alopecuroides (Ningxian) and D.caespitosa (Tianzhu) could germinate.The order of salt tolerance was P.alopecuroides (Ningxian)> D.caespitosa (Weiyuan)> D.caespitosa (Tianzhu) > A.splendens (Wuwei) > A.splendens (Lanzhou) > C.nubigena (Weiyuan) > C.rochebruni (Weiyuan). |
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| Keywords: | wild ornamental grass temperature salt tolerant germination characteristic comprehensive evaluation |
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