| 5种冷季型草坪草的耐热性研究 |
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| 引用本文： | 孙彦,张芸芸.5种冷季型草坪草的耐热性研究[J].草业科学,2011,28(11):1909-1914. |
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| 作者姓名： | 孙彦 张芸芸 |
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| 作者单位： | 中国农业大学动物科技学院草业科学系,北京,100193 |
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| 基金项目： | 国家“十一五”科技支撑计划(2006BAD16B09-2) |
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| 摘 要： | 通过生化培养箱模拟北京地区的高温高湿环境，对高羊茅（Festuca arundinacea）、多年生黑麦草(Lolium perenne)、匍匐剪股颖（Agrostis stolonifera）、草地早熟禾（Poa pratensis）和粗茎早熟禾(P.trivialis)这5种冷季型草坪草在热胁迫过程中的外观质量指标每株绿叶数、生长高度和生理生化指标叶片相对含水量、叶片相对电导率、叶绿素含量、超氧化物歧化酶(SOD)活性、过氧化氢酶(CAT)活性、过氧化物酶(POD)活性进行分析。结果表明，在昼夜35 ℃/30 ℃的高温下，随着胁迫时间的延长，5种草坪草叶片相对含水量下降，叶片相对电导率上升。叶片叶绿素含量在高温环境中变化趋势不一致，高羊茅、多年生黑麦草、草地早熟禾的叶绿素含量呈先上升后下降的趋势，而匍匐剪股颖和粗茎早熟禾则呈现出持续下降的趋势。随着高温胁迫时间的延长，5种草坪草的SOD、POD活性呈先上升后下降的变化趋势。CAT活性下降，且随着时间的延长，POD和CAT活性下降的幅度增大。在高温胁迫过程中，5种草坪草每株绿叶数和植株生长高度降低。 通过聚类分析可将5种草坪草大致聚为3个耐热级别：1级（相对耐热）高羊茅；2级（中等耐热）草地早熟禾、多年生黑麦草、匍匐剪股颖；3级（相对敏感）粗茎早熟禾。
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| 关 键 词： | 冷季型草坪草 耐热性 外观指标 生理生化指标 |
A study on heat tolerance of five cool-season turfgrasses |
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| SUN Yan,ZHANG Yun-yun.A study on heat tolerance of five cool-season turfgrasses[J].Pratacultural Science,2011,28(11):1909-1914. |
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| Authors: | SUN Yan ZHANG Yun-yun |
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| Institution: | (Department of Grassland Science,College of Animal Science and Technology, China Agricultural University,Beijing 100193,China) |
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| Abstract: | The experiment was conducted to investigate heat tolerance of the five kinds of cool-season grasses,including Festuca arundinacea,Lolium perenne,Agrostis stolonifera,Poa pratensis and P.trivialis,through analyzing apparent indexes: green leaf number/plant and growth height;and physiological-biochemical indexes: relative water content,relative electric conductivity,chlorophyll content,SOD activity,CAT activity and POD activity,in artificial climatic chamber with high temperature(35 ℃/30 ℃,day/night) and high humidity(75%).The result showed that at high temperature(day/night,35 ℃/30 ℃),the relative water content of five grasses decreased;and the relative electric conductivity of five grasses increased with threatened time increasing.The change of leaf chlorophyll content of five grasses was not consistence.The chlorophyll content of F.arundinacea,L.perenne and P.pratensis showed increased at first and then decreased;and the chlorophyll content of other two species decreased all the time.The SOD and POD activities of five grasses increased firstly and then decreased.CAT activity decreased all the time.The green leaf number/plant and plant growth height of five grasses decreased with threatened time increasing.The five grasses were classified three groups by a cluster analysis.The first group(heat tolerance) was F.arundinacea;the second group(moderate heat tolerance) were P.pratensis,L.perenne and A.stolonifera;and the third group(sensitive to heat) was P.trivialis. |
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| Keywords: | cool-season grasses heat tolerance apparent index physiological-biochemical index |
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