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梓属5个种对干旱胁迫的生理响应
引用本文:于晓池,杨桂娟,董菊兰,王军辉,麻文俊,张鹏.梓属5个种对干旱胁迫的生理响应[J].植物研究,2021(1).
作者姓名:于晓池  杨桂娟  董菊兰  王军辉  麻文俊  张鹏
作者单位:东北林业大学;中国林业科学研究院林业研究所;甘肃省小陇山林业实验局林业科学研究所
基金项目:国家重点研发计划课题“楸树良种选育与高效培育技术研究”(2017YFD0600604)。
摘    要:为分析梓属5个种干旱胁迫响应程度,为梓属耐旱树种的筛选、抗旱育种及栽培工作提供理论依据。本研究选取梓属的黄金树、滇楸、灰楸、梓树和楸树为试材,将其在浇水量为700 mL和400 mL的水分条件下培养50 d,测量其苗高、地径、叶水势、叶绿素相对含量、叶绿素荧光参数和比叶重等指标,并运用隶属函数法对其抗旱性进行综合评价。结果表明:在2种水分条件下,生长状态最好的为楸树,梓树相对较差。在干旱胁迫条件下,除黄金树外,其他各树种的叶片水势(ΨL)都降低,最大气孔导度(Gs)均增加。不同种的叶绿素相对含量(SPAD)值均在干旱胁迫条件下升高。除滇楸和楸树外,各树种的光系统Ⅱ最大光能转换效率(Fv/Fm)随干旱胁迫而增加。除灰楸外,干旱胁迫增加了其他树种的比叶重(LMA)。利用隶属函数法综合评价抗旱性的结果为:灰楸>梓树>滇楸>楸树>黄金树。说明梓属不同树种间有着不同的抗旱能力。综合分析,楸树和灰楸的抗旱能力较强,滇楸和梓树的抗旱能力次之,黄金树的抗旱能力最差。

关 键 词:梓属  干旱胁迫  生理响应  差异

Physiological Responses to Drought Stress of Five Species from Catalpa Scop.
YU Xiao-Chi,YANG Gui-Juan,DONG Ju-Lan,WANG Jun-Hui,MA Wen-Jun,ZHANG Peng.Physiological Responses to Drought Stress of Five Species from Catalpa Scop.[J].Bulletin of Botanical Research,2021(1).
Authors:YU Xiao-Chi  YANG Gui-Juan  DONG Ju-Lan  WANG Jun-Hui  MA Wen-Jun  ZHANG Peng
Institution:(Northeast Forestry University,Harbin 150040;Forestry Research Institute of Chinese Academy of Forestry,State Key Laboratory of Forest Genetics and Breeding,State Forestry and Grassland Bureau Key Laboratory of Tree Breeding,Beijing 100091;Xiaolongshan Forestry Experiment Bureau Forestry Research Institute,Tianshui 741022)
Abstract:In order to analyze the response to drought stress of the five species of Catalpa Scop.,to provide theoretical basis for the selection on drought-resistant breeding and cultivation of drought-resistant tree species of Catalpa Scop.,the C.speciosa,C.fargesii f.duclouxii,C.fargesii,C.ovata,and C.bungei were selected as materials,and cultivated for 50 days under the water conditions of 700 and 400 mL respectively,and seedling height,diameter,leaf water potential,relative content of chlorophyll,chlorophyll fluorescence parameters,and specific leaf weight were measured respectively.The membership function method was used to comprehensively evaluate drought resistance.The results showed that the C.bungei grew best but the C.ovata was relatively poorest under the two water conditions.Under drought stress,except for the C.speciosa,the leaf water potential(ΨL)of all other species decreased,and the maximum stomatal conductance(Gs)increased respectively.The relative chlorophyll content(SPAD)of different species increased under drought stress.The maximum light energy conversion efficiency(Fv/Fm)of photosystemⅡof each species increased under drought stress,except for C.fargesii f.duclouxii and C.bungei.In addition to C.fargesii,the specific leaf weight(LMA)of other tree species increased under drought stress.The results of comprehensive drought resistance using the membership function method were gray C.fargesii>C.ovata>C.fargesii f.duclouxii>C.bungei>C.speciosa.The results showed that different species of Catalpa Scop.have different drought resistance.Comprehensive analysis showed that the drought resistance of C.bungei and C.fargesii were strong,and that of C.fargesii f.duclouxii and C.ovata were the second,and that of C.speciosa was the worst.
Keywords:Catalpa Scop    drought stress  physiological response  difference
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