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首页> 美国卫生研究院文献>Annals of Botany >Simulating the germination response to diurnally alternating temperatures under climate change scenarios: comparative studies on Carex diandra seeds
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Simulating the germination response to diurnally alternating temperatures under climate change scenarios: comparative studies on Carex diandra seeds

机译：模拟气候变化情景下昼夜交替发芽的发芽反应：苔草种子的比较研究

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>Background and Aims Environmental temperature regulates plant regeneration via seed in several superimposed ways, and this complex regulation will be disrupted by climate change. The role of diurnally alternating temperatures (ΔT) in terminating dormancy will be a major factor in this disruption, as its effects on seed germination are immediate.>Methods The effect of ΔT on seed germination was modelled using two populations of the wetland sedge Carex diandra, one from a montane site and one from a subalpine site. A cardinal-temperature model was fitted to germination results obtained from a thermal gradient plate, and the model was used to simulate changes in germination under two possible future climate scenarios (RCP2·6 and RCP8·5, for representative concentration pathways) as defined by the Intergovernmental Panel on Climate Change.>Key Results Scenario RCP2·6 projected moderate increases in average temperatures and ΔT, whereas RCP8·5 projected greater warming and higher ΔT. Increasing ΔT decreased the base temperature for seed germination and the thermal time required for germination. The effect of higher ΔT together with the higher temperatures increased germination under both climate scenarios.>Conclusions Carex diandra germination is highly responsive to potential changes in ΔT, and thus this study highlights the role of ΔT in seed responses to climate change. Comprehensive cardinal-temperature models, encompassing the different effects of temperature on seed germination, are needed to understand how climate change will affect plant regeneration.
机译：>背景和目标：环境温度以多种叠加方式调节种子的再生，而这种复杂的调节将因气候变化而中断。昼夜交替温度（ΔT）在终止休眠中的作用将是这种破坏的主要因素，因为它对种子萌发的影响是即时的。>方法使用两个种群来模拟ΔT对种子萌发的影响的湿地莎草Carex diandra，其中一个来自山地，另一个来自亚高山地。根据从热梯度板获得的发芽结果拟合基数温度模型，并使用该模型模拟在两种可能的未来气候情景下的发芽变化（RCP2·6和RCP8·5，代表代表性的浓度途径），其定义如下： >主要结果方案RCP2·6预测平均温度和ΔT会适度增加，而RCP8·5预测变暖和ΔT会更高。 ΔT的增加会降低种子发芽的基础温度和发芽所需的加热时间。 >结论：Carex diandra萌发对ΔT的潜在变化具有高度响应，因此，本研究强调了ΔT在种子对ΔT的响应中的作用。气候变化。需要全面的基温模型，包括温度对种子萌发的不同影响，以了解气候变化将如何影响植物再生。

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