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林业资源管理 ›› 2023, Vol. 0 ›› Issue (2): 79-87.doi: 10.13466/j.cnki.lyzygl.2023.02.011

• 科学研究 • 上一篇    下一篇

白鹃梅属植物抗旱性研究与评价

孙宜1,2,3(), 刘浡洋1,2,3, 石青松1,2,3, 陈燕1,2,3, 包峥焱1,2,3, 王扬1,2,3()   

  1. 1.北京市植物园管理处,北京 100093
    2.北京市植物园管理处 北京市花卉园艺工程技术研究中心,北京 100093
    3.北京市植物园管理处 城乡生态环境北京实验室,北京 100093
  • 收稿日期:2023-03-17 修回日期:2023-04-21 出版日期:2023-04-28 发布日期:2023-06-26
  • 通讯作者: 王扬(1971-),男,北京人,高级工程师,主要从事植物栽培和生理研究等方面的工作。Email:791042102@qq.com
  • 作者简介:孙宜(1972-),女,北京人,正高级工程师,主要从事植物引种、繁殖与推广应用等方面的工作。Email:sunyi72@163.com
  • 基金资助:
    国家植物园(北园)项目“木本香薷和白鹃梅属资源收集及良种优选”(BZ202303)

Study and Evaluation on Drought Resistance of Exochorda Lindl.

SUN Yi1,2,3(), LIU Boyang1,2,3, SHI Qingsong1,2,3, CHEN Yan1,2,3, BAO Zhengyan1,2,3, WANG Yang1,2,3()   

  1. 1. Beijing Botanical Garden Management Office,Beijing 100093,China
    2. Beijing Botanical Garden Management Office/Beijing Floriculture Engineering Technology Research Center,Beijing 100093,China
    3. Beijing Botanical Garden Management Office,Beijing Laboratory of Urban and Rural Ecological Environment,Beijing 100093,China
  • Received:2023-03-17 Revised:2023-04-21 Online:2023-04-28 Published:2023-06-26

摘要:

以红柄白鹃梅和齿叶白鹃梅2 a生播种苗为试验材料,在人工控水条件下,采用盆栽试验,设置100%(对照,CK)、75%(轻度干旱,LD)、50%(中度干旱,MD)、25%(重度干旱,SD)和0%(极度干旱,ED)等5个水分梯度进行干旱胁迫处理,测定2种白鹃梅在干旱胁迫下的形态指标、叶片SPAD值和叶绿素荧光动力学参数,利用相关性分析和主成分分析法对抗旱指标进行筛选与评价。结果表明:1)干旱胁迫导致2种白鹃梅的株高降低,叶片数量减少,叶片含水量降低,叶片SPAD值下降,初始荧光(Fo)增长,最大荧光(Fm)、最大光化学效率(Fv/Fm)降低,但MD时差异不显著。2)相关性分析表明,各抗旱指标间存在一定的相关性,形态指标与生理指标显著相关。3)主成分分析结果表明,7个抗旱指标可分为2类,累计贡献率达96.17%。筛选出FoFmFv/Fm、叶片数量、SPAD值等5个主要抗旱指标对2种白鹃梅的抗旱性进行综合评价,红柄白鹃梅在SD下可正常生长,齿叶白鹃梅在MD下可正常生长。

关键词: 红柄白鹃梅, 齿叶白鹃梅, 干旱胁迫, 植株形态, 叶绿素荧光

Abstract:

The 2-year-old seedlings of Exochorda racemosa and Exochorda serratifolia were used as experimental materials.Under the condition of artificial water control,pot experiments were conducted with five water gradients of 100%(CK),75%(Light drought,LD),50%(Moderate drought,MD),25%(Severe drought,SD)and 0%(Extreme drought,ED)for drought stress treatment.The morphological indexes,SPAD value and chlorophyll fluorescence kinetic parameters of two species of Exochorda under drought stress were measured.The drought resistance indexes were screened and evaluated by correlation analysis and principal component analysis.The results showed that:1) With the intensification of drought stress,the plant height,leaf number,leaf water content,SPAD value,Fm and Fv/Fm of two species of Exochorda decreased,while Fo increased,but the time difference of moderate drought treatment(MD) was not significant.2) Correlation analysis showed that there was a certain correlation between the drought resistance indicators,and there was a significant correlation between morphological indicators and physiological indicators.3) The results of principal component analysis showed that the seven drought resistance indicators could be divided into two categories,with a cumulative contribution rate of 96.17%.Fo,Fm,Fv/Fm,leaf water content and SPAD value were selected as five main drought resistance indicators to comprehensively evaluate the drought resistance of the two species of Exochorda Lindl.Exochorda racemosa could grow normally under severe drought (SD),and Exochorda serratifolia could grow normally under moderate drought (MD).

Key words: Exochorda racemosa, Exochorda serratifolia, drought stress, plant morphology, chlorophyll fluorescence

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