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首页> 外文期刊>Seed Science Research >Predicting the impact of increasing temperatures on seed germination among populations of Western Australian Banksia (Proteaceae).
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Predicting the impact of increasing temperatures on seed germination among populations of Western Australian Banksia (Proteaceae).

机译：预测温度升高对西澳大利亚州龙眼（Proteaceae）种群中种子发芽的影响。

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Temperature is a significant factor influencing seed germination and for many species temperature-mediated germination cues are vital for plant persistence. Rising temperatures forecast as a result of anthropogenic climate change may have a substantial influence on the population and range dynamics of plant species. Here, we report on the thermal constraints on seed germination in natural populations of four congeneric Banksia species collected from a longitudinal climate gradient in Western Australia. We investigated whether germination niche: (1) varied between species; (2) varied among populations of each species; and (3) varied in a consistent manner reflecting the climatic gradients of seed origin. We hypothesized that species would differ and that populations from warmer sites would have a broader temperature window for germination than populations from cooler sites. Species differed in the breadth of their germination niche, but temperatures that stimulated the most rapid and complete germination were similar across all species. A sharp reduction in germination percentage occurred above the optimum temperature, which coincided with significant delays in germination relative to the optimum. The temperatures causing these declines varied among populations. Across the species, there was a significant correlation between optimum germination temperature and mean annual temperature at seed source; however, there was no relationship at the population level for individual species. These data provide insight into the vulnerability of Banksia species to climate change, with those populations that require lower temperatures for germination, or have narrower optimal ranges for germination, likely to be most vulnerable to a warming climate.
机译：温度是影响种子发芽的重要因素，对于许多物种而言，温度介导的发芽线索对于植物的持久性至关重要。人为气候变化导致的气温升高预测可能会对植物种群和范围动态产生重大影响。在这里，我们报告了从西澳大利亚州的纵向气候梯度收集的四种同类Banksia物种自然种群中种子发芽的热约束。我们调查了萌发位是否：（1）在物种之间变化; （2）每个物种的种群之间存在差异; （3）以一致的方式变化，反映出种子起源的气候梯度。我们假设物种会有所不同，温暖地区的种群比寒冷地区的种群具有更大的发芽温度范围。物种在其萌发利基的广度上有所不同，但是在所有物种中刺激最快和最完全萌发的温度都相似。在最佳温度以上发芽率急剧下降，这与相对于最佳发芽的显着延迟相吻合。导致这些下降的温度因人群而异。在整个物种中，最佳发芽温度与种子源的年平均温度之间存在显着的相关性。但是，在种群级别上与单个物种没有任何关系。这些数据提供了对Banksia物种对气候变化的脆弱性的洞察力，因为这些种群需要较低的温度进行发芽，或者具有较窄的最佳发芽范围，因此最容易受到气候变暖的影响。

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