干旱胁迫和复水对掌叶木幼苗叶片结构和水分状况的影响  

Effects of Drought Stress and Rehydration on Leaf Structures and Water Conditions of Handeliodendron bodinieri Seedlings

作　　者：邓雅诗 马朝阳 袁炜蓉 郭松 李在留[1] 杨华妹 林培敏 许秀美 杨东明 Deng Yashi;Ma Chaoyang;Yuan Weirong;Guo Song;Li Zailiu;Yang Huamei;Lin Peimin;Xu Xiumei;Yang Dongming(Key Laboratory of National Forestry and Grassland Administration on Cultivation of Fast-Growing Timber in Central South China,Key Laboratory of Cultivation and Utilization of Subtropical Plantations in Guangxi Universities and Colleges,College of Forestry,Guangxi University,Nanning,Guangxi 530004,China;Architecture and Arts Academy,Guangxi Arts University,Nanning,Guangxi 530007,China;Nanning Flowers Park,Nanning,Guangxi 530001,China)

机构地区：[1]广西大学林学院中南速生材繁育国家林业和草原局重点实验室广西高校亚热带人工林培育与利用重点实验室,广西南宁530004 [2]广西艺术学院建筑艺术学院,广西南宁530007 [3]南宁市花卉公园,广西南宁530001

出　　处：《广西林业科学》2024年第2期178-184,共7页Guangxi Forestry Science

基　　金：广西林业科技推广示范项目(桂林科字[2022]第24号);国家自然科学基金项目(31560200,31060053);广西大学“大学生创新创业训练计划”项目(S202210593343)。

摘　　要：为给喀斯特地区石漠化治理和掌叶木(Handeliodendron bodinieri)的人工繁育提供科学依据,以1年生掌叶木幼苗为试材,通过自然干旱试验,测定干旱胁迫和复水条件下叶片的水分参数,观察解剖结构变化,探究干旱胁迫和复水对掌叶木幼苗叶片解剖结构和水分含量的影响。结果表明,干旱胁迫第0~15天,含水量、相对含水量和水分饱和亏缺均变化较小;干旱胁迫第18天,含水量和相对含水量均降低,水分饱和亏缺增加。干旱胁迫第12天,自由水含量最高,束缚水含量最低;干旱胁迫第18天,束缚水含量最高,自由水含量最低。干旱胁迫第0~18天,上表皮和海绵组织厚度均呈下降趋势,栅海比和组织结构紧密度均呈上升趋势;气孔宽度和气孔面积均呈下降趋势,气孔长度变化不显著,气孔密度呈先升后降的趋势。复水后,含水量、自由水和束缚水含量均快速恢复,气孔宽度、气孔长度、气孔密度和气孔面积均增加,组织结构紧密度降低,组织结构疏松度增加,说明幼苗具有较强的耐旱能力和复水后恢复能力。In order to provide scientific basis for control of rocky desertification in karst areas and artificial breeding of Handeliodendron bodinieri,taking 1-year-old H.bodinieri seedlings as test materials,water parameters of leaves under drought stress and rehydration were measured through natural drought test,and anatomical structural changes were observed to investigate effects of drought stress and rehydration on anatomical structures and water contents of H.bodinieri seedlings'leaves.Results showed that from 0 to 15 days of drought stress,changes of water content,relative water content and water saturation deficit were small.On 18th day of drought stress,water content and relative water content decreased,and water saturation deficit increased.On 12th day of drought stress,free water content was the highest and bound water content was the lowest.On 18th day of drought stress,bound water content was the highest and free water content was the lowest.From 0 to 18 days of drought stress,thicknesses of upper epidermis and spongy tissues showed trends of decrease,and ratio of palisade tissue to spongy tissue and cell tense ratio showed trends of increase.Stomatal width and stomatal area showed trends of decrease.Change of stomatal length was not significant.Stomatal density showed trend of firstly increase and then decrease.After rehydration,water content,free water and bound water contents recovered rapidly.Stomatal width,stomatal length,stomatal density and stomatal area increased.Cell tense ratio decreased and spongy ratio increased,which indicated that seedlings had strong drought tolerance and recovery ability after rehydration.

关 键 词：干旱胁迫 复水 叶片结构 水分含量 掌叶木幼苗 

分 类 号：X123[环境科学与工程—环境科学]