Puglielli Giacomo, Laanisto Lauri, Poorter Hendrik, Niinemets Ülo
Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Tartu, 51006, Estonia.
Plant Sciences (IBG-2), Forschungszentrum Jülich GmbH, Jülich, D-52425, Germany.
New Phytol. 2021 Jan;229(1):308-322. doi: 10.1111/nph.16879. Epub 2020 Oct 20.
The optimal partitioning theory predicts that plants of a given species acclimate to different environments by allocating a larger proportion of biomass to the organs acquiring the most limiting resource. Are similar patterns found across species adapted to environments with contrasting levels of abiotic stress? We tested the optimal partitioning theory by analysing how fractional biomass allocation to leaves, stems and roots differed between woody species with different tolerances of shade and drought in plants of different age and size (seedlings to mature trees) using a global dataset including 604 species. No overarching biomass allocation patterns at different tolerance values across species were found. Biomass allocation varied among functional types as a result of phenological (deciduous vs evergreen broad-leaved species) and broad phylogenetical (angiosperms vs gymnosperms) differences. Furthermore, the direction of biomass allocation responses between tolerant and intolerant species was often opposite to that predicted by the optimal partitioning theory. We conclude that plant functional type is the major determinant of biomass allocation in woody species. We propose that interactions between plant functional type, ontogeny and species-specific stress tolerance adaptations allow woody species with different shade and drought tolerances to display multiple biomass partitioning strategies.
最优分配理论预测，某一特定物种的植物通过将更大比例的生物量分配到获取最具限制性资源的器官来适应不同环境。在适应具有不同非生物胁迫水平环境的物种间是否存在类似模式？我们通过分析在一个包含604个物种的全球数据集中，不同年龄和大小（从幼苗到成熟树）的植物中，对 shade 和干旱具有不同耐受性的木本物种在叶片、茎和根上的生物量分配比例如何不同，来检验最优分配理论。未发现跨物种在不同耐受性值下的总体生物量分配模式。由于物候差异（落叶阔叶树种与常绿阔叶树种）和广泛的系统发育差异（被子植物与裸子植物），生物量分配在功能类型间有所不同。此外，耐受性和不耐受性物种之间生物量分配响应的方向通常与最优分配理论预测的相反。我们得出结论，植物功能类型是木本物种生物量分配的主要决定因素。我们提出，植物功能类型、个体发育和物种特异性胁迫耐受性适应之间的相互作用，使得具有不同 shade 和干旱耐受性的木本物种能够展现多种生物量分配策略。
