| 干旱胁迫对3种针茅种子萌发期抗旱性影响的研究 |
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| 引用本文： | 于鲁宁,程积民,李媛,陈芙蓉,魏琳.干旱胁迫对3种针茅种子萌发期抗旱性影响的研究[J].水土保持通报,2012(3):33-36,61. |
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| 作者姓名： | 于鲁宁 程积民 李媛 陈芙蓉 魏琳 |
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| 作者单位： | 西北农林科技大学资源环境学院;中国科学院水土保持研究所;西北农林科技大学动物科技学院 |
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| 基金项目： | 林业公益性行业科研专项“西北典型区域基于水分管理的森林植被承载力研究”(200904056);中国科学院重要方向“半干旱黄土区植被自然恢复过程及适度利用研究”(KZCX2-YW-441),(KZCX2-YW-149);农业部“现代农业产业技术体系建设专项”(CARS-35);黄土高原土壤侵蚀与旱地农业国家重点实验室基金“黄土区植被自然恢复与利用机理研究”(10502-Z8) |
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| 摘 要： | 以采自宁夏回族自治区云雾山的本氏针茅、大针茅和克氏针茅种子为研究材料,用不同渗透势浓度的聚乙二醇(PEG-6000)模拟干旱胁迫,探讨了干旱胁迫对3种针茅种子萌发特性的影响。结果表明,随着PEG浓度的增加,3种针茅种子的发芽率、活力指数、幼苗的鲜重和抗旱指数均呈下降趋势。其大针茅下降趋势最为明显(p<0.05),而低浓度PEG(5%PEG)对本氏针茅的萌发及生长有一定促进作用。低浓度PEG克氏针茅的发芽率以及幼苗鲜重与对照差异不显著,表明克氏针茅有一定的抗旱性。PEG对幼苗生长的抑制效应比幼根大。3种针茅种子萌发期的抗旱能力依次为:本氏针茅>克氏针茅>大针茅。
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| 关 键 词： | 针茅 种子萌发 抗旱性 |
| 收稿时间： | 6/2/2011 12:00:00 AM |
| 修稿时间： | 2011/12/19 0:00:00 |
Effects of Drought Stress on Drought Resistance of Three Species of StipaSeeds During Germination |
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| YU Lu-ning,CHENG Ji-min,LI Yuan,CHEN Fu-rong and WEI Lin.Effects of Drought Stress on Drought Resistance of Three Species of StipaSeeds During Germination[J].Bulletin of Soil and Water Conservation,2012(3):33-36,61. |
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| Authors: | YU Lu-ning CHENG Ji-min LI Yuan CHEN Fu-rong and WEI Lin |
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| Institution: | 1(1.College of Resources and Environment,Northwest A & F University,Yangling,Shaanxi 712100,China; 2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;3.College of Animal Science and Technology,Northwest A & F University,Yangling,Shaanxi 712100,China) |
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| Abstract: | Three species of Stipa seeds(S.bungeana,S.grandis and S.sareptana var.krylovii) in Ningxia Hui Autonomous Region were taken as a test materials,the effects of drought stress on their germination were studied under different gradients of polyethylene glycol(PEG-6000).Results showed that as the drought intensified,seed germination rate,vitality index,seedling fresh weight and drought resistance index of the three species declined.Especially,the declinations for S.grandis were most significant(p<0.05).The low concentration of PEG(5% PEG) had a certain improvement to seed germination and seedling growth of S.bungeana.Compared with the control treatment,the low concentration of PEG did not significantly reduce the seed germination rate and seedling fresh weight of S.sareptana var.krylovii,which indicates that S.sareptana var.krylovii has a certain drought resistant potential.PEG had a greater inhibiting effect on the seedling growth than that on the root.The drought resistances of the three species declined in the order of S.bungeana>S.sareptana var.krylovii>S.grandis. |
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| Keywords: | Stipa seed germination drought resistance |
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