不同潜水埋深对单叶蔷薇实生苗根系生长与构型的影响  

Impact of Groundwater Depth on Root Growth and Architecture of Rosa persica Seedlings

作　　者：张爱敏 张晓龙 江律 肖丽 罗乐[1,2,3,4,5,6,7] 于超 张启翔[1,2,3,4,5,6,7] Zhang Aimin;Zhang Xiaolong;Jiang Lv;Xiao Li;Luo Le;Yu Chao;Zhang Qixiang(School of Landscape Architecture,Beijing Forestry University,Beijing 100083,China;Beijing Key Lab.of Ornamental Plants Germplasm Innovation and Molecular Breeding,Beijing 100083,China;National Engineering Research Center for Floriculture,Beijing 100083,China;Beijing Lab.of Urban and Rural Ecological Environment,Beijing 100083,China;Engineering Research Center of Landscape Environment of Ministry of Education,Beijing 100083,China;Key Lab.of Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education,Beijing 100083,China;State Key Lab.of Efficient Production of Forest Resources,Beijing 100083,China)

机构地区：[1]北京林业大学园林学院,北京100083 [2]花卉种质创新与分子育种北京市重点实验室,北京100083 [3]国家花卉工程技术研究中心,北京100083 [4]城乡生态环境北京实验室,北京100083 [5]园林环境教育部工程研究中心,北京100083 [6]林木花卉遗传育种教育部重点实验室,北京100083 [7]林木资源高效生产全国重点实验室,北京100083

出　　处：《中国野生植物资源》2024年第4期45-52,共8页Chinese Wild Plant Resources

基　　金：国家自然基金科学基金面上项目(32071820);国家重点研发计划课题(2019YFD1001001);重要花卉分子育种与品种创制研究(QNTD202306)。

摘　　要：目的:为了解单叶蔷薇干旱适应策略并为原生境植被修复提供科学依据。方法:以一年生单叶蔷薇实生苗为研究对象,设置30 cm(D30)、40 cm(D40)、50 cm(D50)、60 cm(D60)和70 cm(D70)5组潜水埋深梯度,利用根系扫描等方法分析其对蔷薇实生苗根系生长和构型的影响。结果:潜水埋深对内部连接总数(a)、外部连接总数(v_(0))、连接总数之和(Pe)、平均拓扑长度(b)和修正拓扑参数q_(a)、q_(b)有显著影响(P<0.05),对拓扑参数Ti无显著影响(P>0.05),q_(a)(0.33~0.73)、q_(b)(0.23~0.88)变化范围较大。整个试验过程根系始终维持50°~60°的低分支角度,但当地下水极端匮乏时(如D70组和对照组CK),根系分支角度有增大趋势。随着干旱胁迫加强,单叶蔷薇实生苗根系的生物量增长速度大于地上生物量增长速度;在D60组、D70组和CK组,根系积累相同生物量,v_(0)的增加速度大于a的增加速度;各组根系分支数增长速度始终小于根系连接数,随干旱程度加深差异呈缩小趋势,以上说明适度的干旱可促进根系分支。结论:单叶蔷薇实生苗根系构型及时响应环境水分变化,适应性极强。Objective:To understand the drought adaptation strategy of Rosa persica and provide scientific basis for vegetation restoration in the native environment.Methods:The annual seedlings of R.persica were taken as the research object.Five sets of groundwater depths were set at 30 cm(D30),40 cm(D40),50 cm(D50),60 cm(D60)and 70 cm(D70),and root growth and architecture were analyzed by root scanning and other methods.Results:The groundwater depth had a significant effect on the internal connections(a),external connections(v_(0)),total number of connections(Pe),average topology length(b),modified topology index q_(a) and modified topology index q_(b)(P<0.05),but had no significant effect on topology index Ti(P>0.05),and the modified topology indices q_(a)(0.33-0.73)and q_(b)(0.23-0.88)varied widely.During the whole experiment,the root system always maintained a low branch angle of 50°-60°,but when the groundwater was extremely scarce(such as D70 group and CK group),the root branch angle tended to increase.With the intensification of drought stress,the growth rate of root biomass was higher than that of aboveground biomass;In D60,D70 and CK groups,the number of v_(0) increased faster than the number of a when the root system of R.persica seedlings accumulated the same biomass;The growth rate of root branch number in each group was always smaller than the root link number,and the difference tended to decrease with the deepening of drought,all of these indicate that moderate drought could promote root branching.Conclusion:The root architecture of R.persica seedlings could respond to the change of environmental water in time and had strong adaptability.

关 键 词：单叶蔷薇 根系构型 拓扑参数 潜水埋深 抗旱 

分 类 号：Q948[生物学—植物学]