title: Copper-induced alteration in sucrose partitioning and its relationship to the root growth of two Elsholtzia haichowensis Sun populations.
abstract: Hydroponic culture was used to comparatively investigate the copper (Cu)-induced alteration to sucrose metabolism and biomass allocation in two Elsholtzia haichowensis Sun populations with one from a Cu-contaminated site (CS) and the other from a non-contaminated site (NCS). Experimental results revealed that biomass allocation preferred roots over shoots in CS population, and shoots over roots in NCS population under Cu exposure. The difference in biomass allocation was correlated with the difference in sucrose partitioning between the two populations. Cu treatment (45 μM) significantly decreased leaf sucrose content and increased root sucrose content in CS population as a result of the increased activities of leaf sucrose synthesis enzymes (sucrose phosphate synthetase and sucrose synthase) and root sucrose cleavage enzyme (vacuolar invertase), which led to increased sucrose transport from leaves to roots. In contrast, higher Cu treatment increased sucrose content in leaves and decreased sucrose content in roots in NCS population as a result of the decreased activities of root sucrose cleavage enzymes (vacuolar and cell wall invertases) that led to less sucrose transport from leaves to roots. These results provide important insights into carbon resource partitioning and biomass allocation strategies in metallophytes and are beneficial for the implementation of phytoremediation techniques.
authors.affiliation: a School of Environmental Studies, China University of Geosciences , Wuhan , China.|b School of Resource and Environmental Science, Wuhan University , Wuhan , China.
authors.forename: Min-Jing
authors.initials: MJ
authors.lastname: Li
authors.affiliation: b School of Resource and Environmental Science, Wuhan University , Wuhan , China.|c Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory (Wuhan University) , Wuhan , China.
authors.forename: Zhi-Ting
authors.initials: ZT
authors.lastname: Xiong
authors.affiliation: a School of Environmental Studies, China University of Geosciences , Wuhan , China.
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.affiliation: a School of Environmental Studies, China University of Geosciences , Wuhan , China.
authors.forename: Yi-Ming
authors.initials: YM
authors.lastname: Kuo
authors.affiliation: a School of Environmental Studies, China University of Geosciences , Wuhan , China.
authors.forename: Lei
authors.initials: L
authors.lastname: Tong
mesh_terms: D001673:Biodegradation, Environmental; D002681:China; D003300:Copper / Q000633:toxicity*; D019686:Lamiaceae / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism; D012989:Soil Pollutants / Q000633:toxicity*; D013395:Sucrose / Q000378:metabolism*
chemical_list: D012989:Soil Pollutants; D013395:Sucrose; D003300:Copper
keywords: Biomass allocation; Elsholtzia haichowensis; copper; invertase; sucrose partitioning