Apoplastic barriers of Populus×canescens roots in reaction to different cultivation conditions and abiotic stress treatments  

作　　者：Paul Grunhofer Ines Heimerich Lena Herzig Svenja Pohl Lukas Schreiber 

机构地区：[1]Department of Ecophysiology,Institute of Cellular and Molecular Botany,University of Bonn,Kirschallee 1,53115 Bonn,Germany

出　　处：《Stress Biology》2023年第1期269-282,共14页逆境生物学（英文）

基　　金：Funding by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation;SCHR17/1;Project Number 391657309)is gratefully acknowledged.

摘　　要：Populus is an important tree genus frequently cultivated for economical purposes.However,the high sensitivity of poplars towards water deficit,drought,and salt accumulation significantly affects plant productivity and limits biomass yield.Various cultivation and abiotic stress conditions have been described to significantly induce the formation of apoplastic barriers(Casparian bands and suberin lamellae)in roots of different monocotyledonous crop species.Thus,this study aimed to investigate to which degree the roots of the dicotyledonous gray poplar(Populus×canescens)react to a set of selected cultivation conditions(hydroponics,aeroponics,or soil)and abiotic stress treatments(abscisic acid,oxygen deficiency)because a differing stress response could potentially help in explaining the observed higher stress susceptibility.The apoplastic barriers of poplar roots cultivated in different environments were analyzed by means of histochemistry and gas chromatography and compared to the available literature on monocotyledonous crop species.Overall,dicotyledonous poplar roots showed only a remarkably low induction or enhancement of apoplastic barriers in response to the different cultivation conditions and abiotic stress treatments.The genetic optimization(e.g.,overexpression of biosynthesis key genes)of the apoplastic barrier development in poplar roots might result in more stress-tolerant cultivars in the future.

关 键 词：HYDROPONICS AEROPONICS Soil Abscisic acid(ABA) Oxygen deficiency Poplar root suberin 

分 类 号：Q945.78[生物学—植物学]