Acta Agrestia Sinica ›› 2018, Vol. 26 ›› Issue (3): 705-717.DOI: 10.11733/j.issn.1007-0435.2018.03.025

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Physiological Responses of Three Kinds of Cool Season Turfgrasses under Continuous Drought Stress, Heat Stress and Their Interaction

SONG Ya-li1, WANG Ke-qin1, WANG Sha2, QIAN Xia-ji1, XU Jing2   

  1. 1. School of Ecology and Soil and Water Conservation, Southwest Forestry University, Kunming, Yunnan Province 650224, China;
    2. School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
  • Received:2017-12-13 Revised:2018-05-15 Online:2018-06-15 Published:2018-08-24

3种冷季型草坪草对持续干旱、高温及其互作的生理生态响应

宋娅丽1, 王克勤1, 王莎2, 钱夏吉1, 徐璟2   

  1. 1. 西南林业大学生态与水土保持学院, 云南 昆明 650224;
    2. 北京林业大学水土保持学院, 北京 100083
  • 通讯作者: 王克勤
  • 作者简介:宋娅丽(1985-),女,山西长治人,博士,讲师,主要从事植物逆境生理生态学研究,E-mail:songyali19851205@sina.com
  • 基金资助:

    云南省应用基础研究青年项目(2016FD044);西南林业大学科研启动基金(111443);云南省高校优势特色重点学科(生态学)建设项目(050005113111);国家林业局生态学重点学科资助

Abstract:

In order to explore the physiological mechanisms of cool season turfgrass responding to adverse environments, continuous drought stress, heat stress and their combination were applied to three kinds of cool season turfgrasses, including perennial ryegrass (Lolium perenne L.), tall fescue (Festuca arundinacea L.) and kentucky bluegrass (Poa pratensis L.). The results showed that after 28 days of the treatment, turf quality and leaf wilting score of three kinds of turf grasses were significantly reduced; synergistic effects to turf quality were explored under interaction of drought and heat stress, and drought stress played a key role in leaf wilting score. After 28 days, leaf relative water contents of ryegrass and tall fescue under each treatment were all below 50%, reduced 36.2% and 46.9% than 21 d treatments, respectively, which showed adverse stresses lead to the water deficit in leaf. Leaf water-holding ability in tall fescue was higher than that in ryegrass and kentucky bluegrass. Kentucky bluegrass had the fastest blade dehydration. The decrease of root biomass was higher than shoot, and root growth was more sensitive than shoot growth. The photosynthetic rate of three kinds of turf grasses decreased significantly under stresses, while the dark respiration rate increased significantly, and the changes under interaction of drought and heat stress was higher than those of single stress. The changes of proline and soluble sugar content of kentucky bluegrass were higher than those of ryegrass and tall fescue, and it was more sensitive to the interaction of drought and heat stress. According to a comprehensive evaluation based on subordinate function of fuzzy mathematics, the order of drought and heat resistance was:Festuca arundinacea > Lolium perenne > Poa pratensis.

Key words: Drought stress, Heat stress, Cool-season turfgrasses, Physiological responses

摘要:

对3种冷季型草坪草黑麦草(Lolium perenne L.)、高羊茅(Festuca arundinacea L.)和早熟禾(Poa pratensis L.)进行持续干旱、高温及其互作处理,通过测定生理生态指标,揭示3种冷季型草坪草对持续干旱高温环境的生理响应机制。结果表明,处理28 d时,各处理下3种草坪草的草坪外观质量TQ和叶片萎蔫系数LWS均显著降低,干旱和高温互作对TQ的影响具有叠加效应,干旱胁迫对LWS起到关键作用。28 d时,各处理下黑麦草和早熟禾叶片相对含水量均低于50%,比胁迫第21 d分别下降了36.2%和46.9%,说明逆境胁迫明显导致草坪草叶片水分亏缺,而高羊茅叶片持水能力强于黑麦草和早熟禾,早熟禾叶片脱水速度最快。各处理下草坪草根系生物量的下降幅度高于地上部分,逆境对根系生长的影响比地上部分更敏感。3种草坪草的光合速率在逆境下显著降低,相反地叶片暗呼吸速率显著增加,两者互作下的降低或增加幅度高于单一胁迫下。各处理下早熟禾的脯氨酸和可溶性糖含量的变化幅度均高于黑麦草和高羊茅,且对干旱高温互作胁迫表现的更为敏感。通过隶属函数综合分析方法对试验测定的9个生理指标进行综合评价,3种冷季型草坪草抗干旱高温能力由强到弱依次为:高羊茅>黑麦草>早熟禾。

关键词: 干旱, 高温, 冷季型草坪草, 生理生态响应

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