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首页> 外文期刊>Seed Science Research >Temperature but not moisture response of germination shows phylogenetic constraints while both interact with seed mass and lifespan
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Temperature but not moisture response of germination shows phylogenetic constraints while both interact with seed mass and lifespan

机译：温度但不是萌发的水分反应显示系统发育限制，同时与种子质量和寿命相互作用

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摘要

Understanding how plant traits interact with climate to determine plant niches is decisive for predicting climate change impacts. While lifespan and seed size modify the importance of germination timing, germination traits such as base temperature and base water potential directly translate climatic conditions into germination timing, impacting performance in later life stages. Yet we do not know how base temperature, base water potential, seed mass, lifespan and climate are related. We tested the relationships between base temperature and base water potential for germination, seed size and lifespan while controlling for bioclimatic regions. We also quantified the phylogenetic signal in germination traits and seed size using Pagel's lambda. We used a worldwide data set of germination responses to temperature and moisture, seed size and lifespan of 240 seed plants from 49 families. Both germination temperature and moisture are negatively related to seed size. Annual plants show a negative relation between seed size and base water potential, whereas perennials display a negative relation between base temperature and seed mass. Pagel's lambda highlighted the slow evolution of base temperature for germination, comparable to seed mass while base water potential was revealed to be labile. In the future, base water potential and seed mass can be used when moisture niches of plants are to be predicted. Lifespan, seed size and base temperature should be taken into account when analysing thermal limits of species distributions.
机译：了解植物特征如何与气候相互作用以确定植物利基对预测气候变化影响决定性。虽然寿命和种子尺寸改变萌发正时的重要性，诸如基础温度和基础水的萌发特征直接将气候条件转化为萌发正时，在后期生命阶段影响性能。然而，我们不知道基础温度，基础水势，种子质量，寿命和气候有何相关。我们测试了萌发，种子尺寸和寿命的基础温度和基础水势之间的关系，同时控制生物恐星区。我们还使用Pagel的λa量化发芽性状和种子大小的系统发育信号。我们使用了49个家庭的温度和水分，种子大小和寿命的全球数据集，从49个家庭中的240种种子植物。萌发温度和水分均与种子大有关。年生植物显示种子大小与基础水​​势之间的负面关系，而多年生植物显示基础温度和种子质量之间的负面关系。 Pagel的Lambda强调了萌发的基础温度的缓慢演变，与种子质量相当，而基础水势被揭示为不稳定。在将来，当要预测植物的水分效力时，可以使用基础水势和种子质量。在分析物种分布的热限制时，应考虑寿命，种子尺寸和基础温度。

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