闽楠种子对快速脱水的响应  

Responses of Phoebe bournei Seeds to Rapid Dehydration

作　　者：李娟[1] 林建勇[1] 欧汉彪 梁瑞龙[1] Li Juan;Lin Jianyong;Ou Hanbiao;Liang Ruilong(Guangxi Forestry Research Institute,Key Laboratory of National Forestry and Grassland Administration on Cultivation of Fast Growing Timber in Central South China,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning,Guangxi 530002,China)

机构地区：[1]广西壮族自治区林业科学研究院,中南速生材繁育国家林业和草原局重点实验室,广西优良用材林资源培育重点实验室,广西南宁530002

出　　处：《广西林业科学》2022年第6期823-827,共5页Guangxi Forestry Science

基　　金：广西科技计划项目(桂AB17292066);广西林科院基本科研业务费专项(林科201824号)。

摘　　要：为给闽楠(Phoebe bournei)种子长期保存和苗木生产提供理论依据,采用硅胶快速脱水方法处理闽楠种子,测定在脱水过程中其种子萌发及部分生理指标的变化,探讨脱水对闽楠种子萌发和抗氧化酶系统的影响。结果表明,新鲜闽楠种子具有较高的含水量(35.53%)和生活力(55.00%);轻度脱水可以促进种子萌发。随种子含水量下降,种子生活力呈先升后降的趋势;含水量降至16.09%时,种子全部失活。含水量从35.53%降至33.72%时,SOD、POD和CAT活性均增加,电导率上升,MDA含量下降;含水量降至31.22%时,SOD活性先降后升,CAT活性下降,POD活性较高,MDA含量先升后降;含水量低于31.22%时,SOD活性降低,POD和CAT活性较高,MDA含量增加,电导率先降后升。闽楠种子为顽拗性种子,储藏的最佳含水量为(33.72±0.69)%,安全含水量为(32.17±0.35)%。In order to provide theory basis for seed long-term preservation and seedling production of Phoebe bournei,taking rapid dehydration of silica gel treating P.bournei seeds,changes of seed germination and some physiological indexes during dehydration were measured to investigate effects of dehydration on seed germina⁃tion and antioxidant enzyme system of P.bournei.Results showed that P.bournei fresh seeds had higher mois⁃ture content(35.53%)and viability(55.00%).Mild dehydration could promote seed germination.When mois⁃ture content decreased from 35.53%to 33.72%,SOD,POD and CAT activities and conductivity increased,and MDA content decreased.When moisture content decreased to 31.22%,SOD activity decreased firstly and then increased,CAT activity decreased,POD activity was higher and MDA content increased firstly and then de⁃creased.When moisture content was lower than 31.22%,SOD activity decreased,POD and CAT activities were higher,MDA content increased,and conductivity decreased firstly and then increased.P.bournei seeds were re⁃calcitrant seeds.Optimum moisture content of P.bournei seeds for storage was(33.72±0.69)%,and safe mois⁃ture content of seeds was(32.17±0.35)%.

关 键 词：脱水耐性 抗氧化酶 顽拗性种子 闽楠 

分 类 号：Q945.79[生物学—植物学]