Northern ragweed ecotypes flower earlier and longer in response to elevated CO2: what are you sneezing at?
Northern ragweed ecotypes flower earlier and longer in response to elevated CO2: what are you sneezing at?
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DOI：
10.1007/s00442-016-3670-x
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发表时间：
2016-10
期刊：
影响因子：
2.7
通讯作者：
Rogers, Christine A.
中科院分区：
文献类型：
--
作者：
Stinson, Kristina A.;Albertine, Jennifer M.;Hancock, Laura M. S.;Seidler, Tristram G.;Rogers, Christine A.
预计在下一个世纪，植物物候和花卉生产将发生重大变化，但我们对许多物种这种反应的地理模式知之甚少，即使是那些可能影响人类福祉的物种。我们测试了致敏植物豚草（豚草）开花反应的变化。我们在实验水平的CO2（400、600和800 µL L−1）下种植了来自美国东北部三个纬度的植物。我们假设，适应较短生长季节的北方生态型会比南方的同类花得更早，从而不成比例地将来自CO2的碳收益分配给繁殖。正如预测的那样，原产地的纬度和二氧化碳水平显着影响开花的时间和规模。随着纬度的增加，生殖开始发生得更早，同时产生的花的数量增加。二氧化碳浓度升高导致所有生态类型的生殖开始较早，这在北方种群中更为明显。我们解释我们的研究结果作为豚草开花时间的生态变异的证据，以及在CO2的反应。因此，豚草对全球变化的反应对生态和人类健康的影响可能取决于纬度。我们的结论是，增加花产量，持续时间，并可能花粉输出，可以预期在美国东北部的二氧化碳水平上升。然而，在该区域的北方地区，影响可能最为严重。
Significant changes in plant phenology and flower production are predicted over the next century, but we know relatively little about geographic patterns of this response in many species, even those that potentially impact human wellbeing. We tested for variation in flowering responses of the allergenic plant, Ambrosia artemisiifolia (common ragweed). We grew plants originating from three latitudes in the Northeastern USA at experimental levels of CO2 (400, 600, and 800 µL L−1). We hypothesized that northern ecotypes adapted to shorter growing seasons would flower earlier than their southern counterparts, and thus disproportionately allocate carbon gains from CO2 to reproduction. As predicted, latitude of origin and carbon dioxide level significantly influenced the timing and magnitude of flowering. Reproductive onset occurred earlier with increasing latitude, with concurrent increases in the number of flowers produced. Elevated carbon dioxide resulted in earlier reproductive onset in all ecotypes, which was significantly more pronounced in the northern populations. We interpret our findings as evidence for ecotypic variation in ragweed flowering time, as well in responses to CO2. Thus, the ecological and human health implications of common ragweed’s response to global change are likely to depend on latitude. We conclude that increased flower production, duration, and possibly pollen output, can be expected in Northeastern United States with rising levels of CO2. The effects are likely, however, to be most significant in northern parts of the region.
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影响因子：
7.4
作者：
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影响因子：
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