Thermal Requirements Underpinning Germination Allude to Risk of Species Decline from Climate Warming
Thermal Requirements Underpinning Germination Allude to Risk of Species Decline from Climate Warming
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DOI：
10.3390/plants9060796
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发表时间：
2020-06-01
期刊：
影响因子：
4.5
通讯作者：
Cochrane, Jennifer Anne
中科院分区：
文献类型：
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作者：
Cochrane, Jennifer Anne
种子储存是在面临气候变化等日益严重的威胁时保护植物遗传多样性的常用手段。在这里，从过去十年的研究结果到发芽的热要求是合成的100多个植物物种从西澳大利亚州南部。这个全球生物多样性热点地区预计将在预测的气候变化下遭受主要植物崩溃。一个温度梯度板被用来评估的热需求支撑种子萌发在常见的和地理限制的物种。结果表明，当地气候的种子来源网站不驱动种子的反应，也不是最佳发芽温度的指示。低昼夜阶段的温度制度提供了最显着的影响发芽时间。有几个物种在低于或接近当前湿季温度的平均温度下发芽最佳，超过40%的物种可能会在未来受到影响，发芽发生在超最佳温度条件下。这项研究强调了物种在生命周期再生阶段对气候变暖的脆弱性和恢复能力，并为那些旨在管理，保护和恢复该区域植物群的人提供了重要信息。
The storage of seeds is a commonly used means of preserving plant genetic diversity in the face of rising threats such as climate change. Here, the findings of research from the past decade into thermal requirements for germination are synthesised for more than 100 plant species from southern Western Australia. This global biodiversity hotspot is predicted to suffer major plant collapse under forecast climate change. A temperature gradient plate was used to assess the thermal requirements underpinning seed germination in both commonly occurring and geographically restricted species. The results suggest that the local climate of the seed source sites does not drive seed responses, neither is it indicative of temperatures for optimal germination. The low diurnal phase of the temperature regime provided the most significant impact on germination timing. Several species germinated optimally at mean temperatures below or close to current wet quarter temperatures, and more than 40% of species were likely to be impacted in the future, with germination occurring under supra-optimal temperature conditions. This research highlights both species vulnerability and resilience to a warming climate during the regeneration phase of the life cycle and provides vital information for those aiming to manage, conserve and restore this regional flora.