Large seeds provide an intrinsic growth advantage that depends on leaf traits and root allocation
Large seeds provide an intrinsic growth advantage that depends on leaf traits and root allocation
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大种子提供了内在的生长优势，这取决于叶子性状和根部分配
DOI：
10.1111/1365-2435.13871
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发表时间：
2021
影响因子：
5.2
通讯作者：
Simpson K
中科院分区：
文献类型：
--
作者：
Simpson K
种子质量和生长速率是植物生态多样性的重要维度，但它们之间的关系尚未得到解决。RGR和种子质量之间的负相关关系已得到充分确立。然而，RGR是大小依赖的，所以小种子物种可能会实现快速生长，因为它们最初很小。我们使用前所未有的大小数据集，采样382个草种，使用RGR和SGR研究种子质量和生长速率（特定大小的RGR），解释了生物学、生态学和生物学中的多样性。（例如生命史、光合作用途径）和环境RGR和SGR与种子质量呈相反的关系，大种子物种的RGR较低，但SGR高于小种子物种。然而，SGR和种子质量之间的关系取决于叶片干物质含量（LDMC），并且仅在高LDMC物种中呈正相关。当在一个共同的大小进行比较时，大种子和低LDMC物种的快速生长与我们实验所用的高温高光环境中更大的生物量分配到根部有关。光合作用途径和生活史对SGR的变异有一定影响，无论种子大小，C4一年生植物的SGR都高于C3多年生植物，因此，大种子为具有资源保护叶性状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。这项工作推进了对种子质量和生长速率如何与其他生态因子共同进化的理解。在本文的支持信息中可以找到免费的简明语言摘要。
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 C4annuals having higher SGRs than C3perennials 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.A free Plain Language Summary can be found within the Supporting Information of this article.
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影响因子：
5.5
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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通讯作者：
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