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Journal of Plant Research

, Volume 132, Issue 2, pp 237–249 | Cite as

Plasticity of functional traits and optimality of biomass allocation in elevational ecotypes of Arabidopsis halleri grown at different soil nutrient availabilities

  • Qing-Wei WangEmail author
  • Maya Daumal
  • Soichiro Nagano
  • Naofumi Yoshida
  • Shin-Ichi Morinaga
  • Kouki Hikosaka
Regular Paper
  • 165 Downloads

Abstract

In mountainous areas, plant distribution is constrained by various environmental stresses. Plasticity and constancy in plant functional traits may relate to optimal strategies at respective habitats and to ecotypic differentiation along elevation. Although plant biomass allocation has been extensively studied in relation to adaptation to soil nutrient availability along elevation, its optimality is still poorly understood. We examined soil nutrient availability in the field and conducted growth analysis for two elevational ecotypes of Arabidopsis halleri grown under different nutrient availabilities. We determined plasticity in morphological and physiological traits and evaluated optimal biomass allocation using an optimality model. Our field investigation indicated that soil nitrogen (N) availability increased rather than decreased with increasing elevation. Our growth analysis revealed that lowland ecotype was more plastic in morphological variables and N concentrations, whereas the highland ecotype was more plastic in other physiological variables such as the net assimilation rate (NAR). The leaf mass ratio (LMR) in the lowland ecotype was moderately plastic at the whole range of N availabilities, whereas LMR in the highland ecotype was very plastic at higher N availabilities only. The optimality model indicated that the LMR of the lowland ecotype was nearly optimal throughout the range of studied N availabilities, whereas that of the highland ecotype was suboptimal at low N availability. These results suggest that highland ecotype is adapted only to high N availability, whereas the lowland ecotype is adapted to a relatively wide range of N availabilities as a result of natural selection in their respective habitats. We conclude that an adaptive differentiation has occurred between the two ecotypes and plasticity in the biomass allocation is directly related to its optimization in changing environments.

Keywords

Functional differentiation Optimal allocation Phenotypic plasticity Root/shoot ratio Relative growth rate Functional traits 

Notes

Acknowledgements

We thank Dr. Riichi Oguchi for providing valuable comments. This work was supported by grants from MEXT, Japan (KAKENHI nos. 17H03727, 25291095, 21114009), a research grant from the Mitsui & Co., Ltd. Environment Fund, and CREST (no. JPMJCR11B3), JST, Japan.

Author contributions

KH designed the research, SM, NY and KH conducted fieldwork, QWW, MD, and SN performed experiments and determined variables of samples, QWW analyzed data and performed simulation analysis, and QWW and KH wrote the manuscript.

Supplementary material

10265_2019_1088_MOESM1_ESM.pdf (427 kb)
Supplementary material 1 (PDF 426 KB)

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Copyright information

© The Botanical Society of Japan and Springer Japan KK, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Graduate School of Life SciencesTohoku UniversitySendaiJapan
  2. 2.Forestry and Forest Products Research InstituteTsukubaJapan
  3. 3.Forest Tree Breeding CenterForestry and Forest Products Research InstituteHitachiJapan
  4. 4.Faculty of ScienceTohoku UniversitySendaiJapan
  5. 5.College of Bioresource SciencesNihon UniversityFujisawaJapan

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