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Large seeds provide an intrinsic growth advantage that depends on leaf traits and root allocation
Functional Ecology ( IF 4.6 ) Pub Date : 2021-06-24 , DOI: 10.1111/1365-2435.13871 Kimberley J. Simpson 1 , Rebecca R.L. Atkinson 1 , Emily J. Mockford 1 , Christopher Bennett 1 , Colin P. Osborne 1 , Mark Rees 1
中文翻译：
大种子提供取决于叶子特征和根分配的内在生长优势
更新日期：2021-06-24
Functional Ecology ( IF 4.6 ) Pub Date : 2021-06-24 , DOI: 10.1111/1365-2435.13871 Kimberley J. Simpson 1 , Rebecca R.L. Atkinson 1 , Emily J. Mockford 1 , Christopher Bennett 1 , Colin P. Osborne 1 , Mark Rees 1
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- Seed mass and growth rate are important dimensions of plant ecological diversity, but their relationship remains unresolved. Negative relationships between RGR and seed mass are well-established. However, RGR is size dependent, so small-seeded species might achieve fast growth simply because they are initially small.
- Using a dataset of unprecedented size, sampling 382 grass species, we investigated seed mass and growth rate using both RGR and SGR (RGR at a specific size), accounting for diversity in phylogeny, ecology (e.g. life history, photosynthetic pathway) and environment (mean annual temperature and precipitation).
- RGR and SGR showed contrasting relationships with seed mass, such that large-seeded species had lower RGR but higher SGR than small-seeded species. However, the relationship between SGR and seed mass depended on leaf dry matter content (LDMC), and was only positive in high-LDMC species. When compared at a common size, the fast growth of large-seeded and low-LDMC species was associated with greater biomass allocation to roots in the hot, high-light environment used for our experiment. Photosynthetic pathway and life history contributed to variation in SGR, with C4 annuals having higher SGRs than C3 perennials regardless of seed size.
- Large seeds therefore afford an intrinsic growth advantage in species with resource-conserving leaf traits, and may provide a competitive edge in resource-poor environments. This work advances the understanding of how seed mass and growth rate co-evolve with other ecological factors.
中文翻译：
大种子提供取决于叶子特征和根分配的内在生长优势
- 种子质量和生长速度是植物生态多样性的重要维度，但它们之间的关系仍未得到解决。RGR 和种子质量之间的负相关关系已经确立。然而，RGR 取决于大小，因此小种子物种可能仅仅因为它们最初很小而实现快速生长。
- 使用规模空前的数据集，对 382 种草种进行采样，我们使用 RGR 和 SGR（特定大小的 RGR）研究了种子质量和生长速率，说明了系统发育、生态学（例如生活史、光合作用途径）和环境的多样性（年平均气温和降水量）。
- RGR 和 SGR 与种子质量显示出对比关系，因此大种子物种的 RGR 较低，但 SGR 高于小种子物种。然而，SGR 与种子质量之间的关系取决于叶干物质含量 (LDMC)，并且仅在高 LDMC 物种中呈正相关。当以普通大小进行比较时，大种子和低 LDMC 物种的快速生长与我们实验所用的炎热、高光环境中根的生物量分配更大有关。光合途径和生活史导致 SGR 的变化，无论种子大小如何，C 4一年生植物的 SGR 都高于 C 3多年生植物。
- 因此，大种子为具有资源节约型叶片特性的物种提供了内在的生长优势，并可能在资源贫乏的环境中提供竞争优势。这项工作促进了对种子质量和生长速度如何与其他生态因素共同进化的理解。
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