摘要
以16年生桑树种子为试验材料,研究了不同NaCl浓度和温度对种子萌发、幼苗生长及根系生长的影响。结果表明:随盐浓度增加,发芽率、发芽指数、活力指数、幼苗干质量、根干质量和根冠比、根长和根表面积降低,平均发芽时间和根平均直径增加。随温度的上升,发芽率和发芽指数逐渐升高,平均发芽时间变小,但幼苗生物量、根系生物量、根冠比、根长和根表面积都是先增加再降低,30℃时最大。NaCl浓度和温度在平均发芽时间、根系生物量和根冠比上有着显著的交互作用,适度的高温缓解了桑树种子萌发时的盐胁迫程度。幼苗生物量与根系生物量、根冠比、根长和根表面积成极显著正相关,根系生长是反应幼苗受胁迫的敏感指标。
Seeds from 16-year-old Morus alba trees were used to investigate the effects of NaCl concentrations and germination temperatures on seed germination,seedling growth and root development.Results showed that the germination percentage,germination index,vigor index,seedling biomass,root biomass,root/shoot ratio,root length and root surface area decreased with the increase of salt concentration,mean germination time and root diameter increased.With the increase of temperature,G and GI increased,MGT decreased,but SB,RB,R/S,RL and RSA increased first and then decreased,and reached the maximum at 30℃.NaCl concentration and temperature had significant interaction on MGT,RB and R/S,and the appropriate increase of temperature alleviated the salt stress of the above indexes.SB was significantly positive correlated with RB,R/S,RL and RSA,and root growth was a sensitive index to reflect the stress of seedlings.
作者
黄恒
付锦雪
曹帮华
赵文轩
郝木征
毛培利
王甜甜
郝迎东
张希画
谭海涛
Huang Heng;Fu Jinxue;Cao Banghua;Zhao Wenxuan;Hao Muzheng;Mao Peili;Wang Tiantian;Hao Yingdong;Zhang Xihua;Tan Haitao(Key Laboratory of State Forestry Administration for Silviculture of the lower Yellow River/Forest Ecosystem Research Station in Taishan Mountain,Shandong Agricultural University,Taian Shandong 271018,China;Dongying Garden Greening Center,Dongying Shandong 257091,China;Administration Bureau of the Yellow River Delta National Nature Reserve,Dongying Shandong 257500,China)
出处
《西南林业大学学报(自然科学)》
CAS
北大核心
2021年第2期30-37,共8页
Journal of Southwest Forestry University:Natural Sciences
基金
国家重点研发项目(2017YFD0601203)资助
国家自然科学基金项目(31770669)资助
山东省重大科技创新工程(2017CXGC0316)资助
山东省科技发展计划项目(42015GNC111026)资助
山东农业大学青年科技创新基金项目资助。
关键词
桑树
盐胁迫
温度
根系
根冠比
幼苗生物量
Morus alba
salt stress
temperature
root
root/shoot ratio
seedling biomass