干旱胁迫对9个楸树无性系生长和叶绿素荧光参数的影响  

Effects of drought stress on growth and chlorophyll fluorescence parameters of nine Catalpa chinensis clones

作　　者：周星健 唐丽[1] 蒋龙 林峰[2] 李轲 刘振华[2] ZHOU Xingjian;TANG Li;JIANG Long;LIN Feng;LI Ke;LIU Zhenhua(Central South University of Forestry and Technology,Changsha 410004,Hunan,China;Hunan Academy of Forestry,Changsha 410004,Hunan,China;Xiangxi Tujia and Miao Autonomous Prefecture Forestry Research Institute,Jishou 416000,Hunan,China)

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]湖南省林业科学院,湖南长沙410004 [3]湘西土家族苗族自治州林业科学研究所,湖南吉首416000

出　　处：《湖南林业科技》2025年第1期37-44,共8页Hunan Forestry Science & Technology

基　　金：湖南省林业科技计划项目(XLKY202312);湖南林业外资项目科技支撑项目—欧洲投资银行贷款湖南森林提质增效示范项目科技支撑项目(OT-S-KTA1);长沙市杰出青年培养计划(kq2009087)。

摘　　要：为了研究干旱胁迫对楸树不同无性系生长和叶绿素荧光参数的影响,本文以9个楸树无性系为研究对象,采用泥炭土、黄土与珍珠岩(体积比1∶1∶1)混合作为基质,选取生长势一致的根插幼苗进行盆栽控水试验,设置轻度、中度和重度干旱胁迫以及对照4种处理,在经历60 d的干旱胁迫后,测定9个无性系的生长量、叶片叶绿素相对含量及其叶绿素荧光参数。结果显示:相较于对照组,在轻度干旱胁迫下,无性系LS-22和1-3的株高、地径及叶片中的叶绿素相对含量有所增加;其他干旱胁迫处理下,各无性系幼苗的株高、地径及叶片中叶绿素相对含量均呈现下降趋势。此外,各无性系的初始荧光呈现上升趋势,而最大荧光、PSII最大光化学效率、PSII潜在活性以及实际光化学速率则均呈现下降趋势。In order to study the effects of drought stress on the growth and chlorophyll fluorescence parameters of different clones of Catalpa catalppus,nine clones were selected as the research objects,peat soil,loess and perlite(volume ratio 1∶1∶1)were mixed as the substrate,and root-inserted seedlings with the same growth potential were selected for pot water control experiment,and four drought stress levels were set up including the control,mild stress,moderate stress and severe stress.The growth,leaf relative chlorophyll content and chlorophyll fluorescence parameters of 9 clones were measured after 60 days of drought stress.The results showed that the plant height,ground diameter and leaf relative chlorophyll content of LS-22 and 1-3 clones increased under mild drought stress compared with the control group,while the plant height,ground diameter and leaf relative chlorophyll content showed a downward trend under other drought stress treatments.In addition,the initial fluorescence of the clones showed an increasing trend,while the maximum fluorescence,maximum photochemical efficiency of PSII,potential activity of PSII and actual photochemical rate showed a decreasing trend.

关 键 词：楸树 无性系 干旱胁迫 叶绿素荧光 

分 类 号：Q945.79[生物学—植物学]