| 要旨トップ | 目次 | 日本生態学会第65回全国大会 (2018年3月、札幌) 講演要旨
ESJ65 Abstract


一般講演(ポスター発表) P3-073  (Poster presentation)

Optimality and plasticity of biomass allocation in elevational ecotypes of Arabidopsis halleri at different soil nutrient availabilities

*Qingwei WANG(東北大学, 森林総合研究所), Maya Daumal(東北大学), Soichiro Nagano(かずさDNA研究所), Naofumi Yoshida(東北大学), Shin-Ichi Morinaga(日本大学), Kouki Hikosaka(東北大学)

- Plasticity and constancy in plant functional traits may relate to optimal strategies at the respective habitat and to ecotypic differentiation along elevation.
- We examined soil N availability in the field and conducted a growth analysis for two elevational ecotypes of Arabidopsis halleri grown under different nutrient availabilities to evaluate phenotypic plasticity and optimal biomass allocation.
- Soil N availability increased rather than decreased with increasing elevation. The highland ecotype was more plastic in physiological variables, whereas lowland ecotype was more plastic in morphological variables and N concentrations. The leaf mass ratio (LMR) in the lowland ecotype was moderately plastic at the whole range of studied N availabilities, whereas LMR in the highland ecotype was very plastic at higher N availabilities but not at lower N availabilities. An optimality model indicated that LMR of the lowland ecotype was nearly optimal at the whole range of studied N availability, whereas that of the highland ecotype was suboptimal at the low N availability.
- Our results suggest that the highland ecotype is adapted only to high N availabilities, whereas the lowland ecotype is adapted to relatively wide range of N availability as a result of natural selection in their respective habitats.


日本生態学会