Impacts of growth form and phylogenetic relatedness on seed germination: A large‐scale analysis of a subtropical regional flora,Ecology and Evolution

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Impacts of growth form and phylogenetic relatedness on seed germination: A large‐scale analysis of a subtropical regional flora
Ecology and Evolution ( IF 2.3 ) Pub Date : 2021-01-07 , DOI: 10.1002/ece3.7132
JuHong Wang ₁ , GeXi Xu ₂ , Wen Chen ₃ , YanBo Ma ₄ , Wei Qi ₅ , ChunHui Zhang ₆ , XianLiang Cui ₇

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Plant regeneration strategy plays a critical role in species survival and can be used as a proxy for the evolutionary response of species to climate change. However, information on the effects of key plant traits and phylogenetic relatedness on seed germination is limited at large regional scales that vary in climate. To test the hypotheses that phylogenetic niche conservatism plays a critical force in shaping seed ecophysiological traits across species, and also drives their response to climatic fluctuation, we conducted a controlled experiment on seed germination and determined the percentage and rate of germination for 249 species in subtropical China under two temperature regimes (i.e., daily 25°C; daily alternating 25/15°C for each 12 hr). Germination was low with a skewed distribution (mean = 38.9% at 25°C, and 43.3% at 25/15°C). One fifth of the species had low (<10%) and slow (4–30 days) germination, and only a few (8%) species had a high (>80%) and rapid (1.2–6.6 days) germination. All studied plant traits (including germination responses) showed a significant phylogenetic signal, with an exception of seed germination percentage under the alternating temperature scenario. Generalized linear models (GLMs) and phylogenetic generalized estimation equations (GEEs) demonstrated that growth form and seed dispersal mode were strong drivers of germination. Our experimental study highlights that integrating plant key traits and phylogeny is critical to predicting seed germination response to future climate change.

更新日期：2021-02-05

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