Rhizosphere microbe populations but not root traits induced by drought in Populus euphratica males  

作　　者：Zhichao Xia Yue He Jiahui Xu Zuodong Zhu Helena Korpelainen Chunyang Li 

机构地区：[1]College of Life and Environmental Sciences,Hangzhou Normal University,Hangzhou 311121,China [2]Department of Agricultural Sciences,Viikki Plant Science Centre,University of Helsinki,P.O.Box 27,FI-00014,Finland [3]College of Agriculture and Biotechnology,Zhejiang University,Hangzhou 310058,China

出　　处：《Soil Ecology Letters》2023年第2期91-102,共12页土壤生态学快报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.U1803231).

摘　　要：How sex-related root traits and soil microbes and their interactions respond to drought remains unclear.Here,we investigated how fine root traits and the composition of rhizosphere microbial communities in Populus euphratica females and males respond to drought in concert in 17-year-old plantations.Females increased specific root length(SRL)in response to drought.However,males showed no changes in their roots but significant increases in arbuscular mycorrhizal hyphal biomass and population of Gram-negative bacteria in the rhizosphere.Also,fungal symbiotroph communities associated with root systems in males differed from those in females under drought.We further demonstrated that the Gram-positive to Gram-negative bacteria ratios positively correlated with the SRL,while fungi to bacteria ratios were negatively correlated.Meanwhile,the relative abundance of symbiotrophs was negatively correlated with the SRL,while saprotroph abundance was positively correlated.Nevertheless,the relative abundance of symbiotrophs was positively correlated with the root carbon content(RCC).These findings indicate that microbial responses to drought depend highly upon the sex of the plant and microbial group and are related to root trait adjustments to drought.This discovery also highlights the role of plant-microbial interactions in the ecosystems of P.euphratica forest plantations.

关 键 词：DIOECY DROUGHT Root functional traits Root-soil-microbe interactions Fungal functional guilds Sex-specific responses 

分 类 号：S15[农业科学—土壤学]