Root traits and rhizosphere processes reflect differential phosphorus acquisition strategies in contrasting Populus clones

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http://hdl.handle.net/10138/336569

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Xia , Z , He , Y , Yu , L , Miao , J , Korpelainen , H & Li , C 2020 , ' Root traits and rhizosphere processes reflect differential phosphorus acquisition strategies in contrasting Populus clones ' , Forest Ecology and Management , vol. 457 , 117750 . https://doi.org/10.1016/j.foreco.2019.117750

Title: Root traits and rhizosphere processes reflect differential phosphorus acquisition strategies in contrasting Populus clones
Author: Xia, Zhichao; He, Yue; Yu, Lei; Miao, Jie; Korpelainen, Helena; Li, Chunyang
Contributor: University of Helsinki, Viikki Plant Science Centre (ViPS)
Date: 2020-02-01
Language: eng
Number of pages: 8
Belongs to series: Forest Ecology and Management
ISSN: 0378-1127
URI: http://hdl.handle.net/10138/336569
Abstract: Soil phosphorus (P) availability and its distribution influence plant growth and productivity. To evaluate strategies that allow genotypes to be efficient under variable P environments, we planted six hybrid Populus deltoides clones belonging to the section Aigeiros (Aig), LL1, LL9, NL351, NL35, NL1388 and NL895, to three growth conditions in a greenhouse experiment, including low P, a high homogenous P supply and a high heterogeneous P supply. Functional traits, including foliar and root traits as well as rhizosphere processes, were measured. Large genotypic variation in shoot biomass and leaf P concentration was found in response to the P supply level and pattern. Compared with no P supply, LL1, LL9 and NL895 had a greater root length, biomass and P concentration in leaves under a homogenous P supply, while growth traits of NL351, NL35 and NL1388 were not significantly affected. A heterogeneous P supply enhanced the shoot biomass of LL1 and LL9. The root proliferation of LL1 and LL9 in P-rich patches was related to increased P acquisition in leaves. By contrast, a heterogeneous P supply did not enhance the biomass accumulation and the morphological plasticity of roots in other four genotypes, NL351, NL35, NL895 and NL1388, in P-rich patches. We found that functional traits or rhizosphere processes under low P could predict high P performance in Populus clones. Genotypes with a higher specific root length under low P can accumulate a larger biomass under a homogenous P supply. Conversely, high acid phosphatase concentrations decreased the positive impact of a heterogeneous P supply on a genotype's performance. Our results provide implications and applications for silviculture and forest management.
Subject: 11831 Plant biology
4112 Forestry
P shortage
P supply pattern
Rhizosphere processes
Root traits
Genotypic variation
Low weight organic acid
HYBRID POPLAR CLONES
ARBUSCULAR MYCORRHIZAL SYMBIOSIS
PLANT FUNCTIONAL TRAITS
MORPHOLOGICAL PLASTICITY
NUTRIENT-ACQUISITION
BIOMASS PRODUCTION
CHINESE FIR
GROWTH
SOIL
FERTILIZATION
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