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Stage-dependent plasticity in biomass allocation and allometry in response to population density in Abutilon theophrasti: a step forward to understanding the nature of phenotypic plasticity

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Abstract

How plants respond to density via modular plasticity is obscure, probably because relevant studies using covariance analysis (ANCOVA) and allometric analysis rarely focus on multiple stages of plant growth, and also the two approaches are seldom used simultaneously. In this study, a field experiment evaluated the effects of three density levels on resource allocation traits in Abutilon theophrasti and tested the degree to which these were explained by indirect effects of density on biomass over time. Results showed inconsistent responses in allocation traits and allometric relationships at each growth stage. At 30 days of plant growth, high density increased root/stem, root/leaf, and stem/leaf, but did not affect any allometric relationships. At 50 days, density altered most mass and ratio traits, but not for allometric exponents. At 70 days, density altered allometric relationships, but did not affect plant allocation patterns. The stage-dependent allometric relationships and the fact that allocation plasticity and allometric plasticity did not coincide both suggested that one-stage allometric plasticity might be apparent plasticity. In response to the increase of density, plants first altered the strategy of biomass partitioning and then growth rate or developmental stage, indicating that density effects intensified over time. For plasticity in a modular trait, size effects can be regarded as a component of (indirect) environmental effects, with the residual variation after removal of size effects being the other component of plant (direct) active response. The insights into apparent plasticity of allometry and two components of plasticity should be of essential importance to investigating phenotypic plasticity and its ecological and evolutionary implications.

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Acknowledgements

We are grateful for the reviewers and editors who provided substantial elaborate and valuable comments on this manuscript.

Funding

This work was funded by the National Natural Science Foundation of China (NSFC, 31800335), Guizhou Province Science and Technology Planning Program (2019-1089), Guizhou University Talent Introduction Research Program (2017-39), and Ecology Domestic First-class Discipline Construction Program (GNYL2017-007) to SW.

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Both authors contributed to the study conception and design. SW conducted the experiment, collected the data, and performed statistical analyses. The first draft of the manuscript was written and edited by SW. All authors read and approved the final manuscript.

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Correspondence to Shu Wang.

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Appendix

Appendix

See Table 4

Table 4 One-way ANCOVAs on log-transformed mean values of the mass of different modules, with population density (PD) as effect, and another module as a covariate (CV) at 30, 50, and 70 days of plant growth and across all stages

See Table 5

Table 5 One-way ANCOVAs on log-transformed mean values of the mass of different modules, with growth stage (GS) as effect, and another module as a covariate (CV) at low, medium, and high densities and across all densities

See Figs. 5, 6, 7, 8, 9, 10, and 11

Fig. 5
figure 5

Mean total biomass (± SE) for plants at low (rectangle), medium (gray-filled rectangle), and high (black-filled rectangle) densities at 30, 50, and 70 days of growth. Different letters indicate significant differences among density treatments (LSD, P < 0.05)

Fig. 6
figure 6

Mean values of root, stem, petiole, lamina (or leaf), reproduction, and branch mass for plants at low, medium, and high densities at 30, 50, and 70 days of growth. Different letters indicate significant differences among density treatments (LSD, P < 0.05)

Fig. 7
figure 7

The log10–log10 regressive relationships among the mass of different modules for individuals at low (green square), medium (red triangle), and high (black circle) densities at 30 d of plant growth. F values with significance levels (*P < 0.10; **P < 0.05; ***P < 0.01; from ANCOVAs on effects of density on a module with another module as a covariate) denote the significant differences between densities

Fig. 8
figure 8

The log10–log10 regressive relationships among the mass of different modules for individuals at low (green square), medium (red triangle), and high (black circle) densities at 50 d of plant growth. F values with significance levels (*P < 0.10; **P < 0.05; ***P < 0.01; from ANCOVAs on effects of density on a module with another module as a covariate) denote the significant differences between densities

Fig. 9
figure 9

The log10–log10 regressive relationships among the mass of different modules for individuals at low (green square), medium (red triangle), and high (black circle) densities at 70 d of plant growth. F values with significance levels (*P < 0.10; **P < 0.05; ***P < 0.01; from ANCOVAs on effects of density on a module with another module as a covariate) denote the significant differences between densities

Fig. 10
figure 10

The log10–log10 regressive relationships among the mass of different modules for individuals at low (green square), medium (red triangle), and high (black circle) densities across all growth stages. F values with significance levels (*P < 0.10; **P < 0.05; ***P < 0.01; from ANCOVAs on effects of density on a module with another module as a covariate) denote the significant differences between densities

Fig. 11
figure 11

The log10–log10 regressive relationships among the mass of different modules for individuals across all densities at 30 days (black circle), 50 days (red triangle), and 70 days (green square) of growth. F values with significance levels (*P < 0.10; **P < 0.05; ***P < 0.01; from ANCOVAs on effects of density on a module with another module as a covariate) denote the significant differences between densities

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Wang, S., Zhou, DW. Stage-dependent plasticity in biomass allocation and allometry in response to population density in Abutilon theophrasti: a step forward to understanding the nature of phenotypic plasticity. Plant Ecol 222, 1157–1181 (2021). https://doi.org/10.1007/s11258-021-01168-8

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