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首页> 外文期刊>American journal of botany >Gas exchange, growth, and defense responses of invasive Alliaria petiolata (Brassicaceae) and native Geum vernum (Rosaceae) to elevated atmospheric CO2 and warm spring temperatures.
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Gas exchange, growth, and defense responses of invasive Alliaria petiolata (Brassicaceae) and native Geum vernum (Rosaceae) to elevated atmospheric CO2 and warm spring temperatures.

机译：入侵的小蒜（Allicaria petiolata）（芸苔科）和本地的金鸡菊（蔷薇科）（Roumaceae）对大气CO 2 升高和春季温度升高的气体交换，生长和防御反应。

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Premise of Study: Global increases in atmospheric CO2 and temperature may interact in complex ways to influence plant physiology and growth, particularly for species that grow in cool, early spring conditions in temperate forests. Plant species may also vary in their responses to environmental changes; fast-growing invasives may be more responsive to rising CO2 than natives and may increase production of allelopathic compounds under these conditions, altering species' competitive interactions. Methods: We examined growth and physiological responses of Alliaria petiolata, an allelopathic, invasive herb, and Geum vernum, a co-occurring native herb, to ambient and elevated spring temperatures and atmospheric CO2 conditions in a factorial growth chamber experiment. Key Results: At 5 wk, leaves were larger at high temperature, and shoot biomass increased under elevated CO2 only at high temperature in both species. As temperatures gradually warmed to simulate seasonal progression, G. vernum became responsive to CO2 at both temperatures, whereas A. petiolata continued to respond to elevated CO2 only at high temperature. Elevated CO2 increased thickness and decreased nitrogen concentrations in leaves of both species. Alliaria petiolata showed photosynthetic downregulation at elevated CO2, whereas G. vernum photosynthesis increased at elevated temperature. Flavonoid and cyanide concentrations decreased significantly in A. petiolata leaves in the elevated CO2 and temperature treatment. Total glucosinolate concentrations and trypsin inhibitor activities did not vary among treatments. Conclusions: Future elevated spring temperatures and CO2 will interact to stimulate growth for A. petiolata and G. vernum, but there may be reduced allelochemical effects in A. petiolata.
机译：研究前提：全球大气中CO 2 和温度的升高可能以复杂的方式相互作用，从而影响植物的生理和生长，特别是对于在凉爽的早春条件下在温带森林中生长的物种。植物物种对环境变化的反应也可能有所不同;快速生长的入侵物可能对CO 2 的增长比本地人更敏感，并且在这些条件下可能增加化感化合物的产生，从而改变物种的竞争相互作用。方法：我们研究了化感入侵植物药小蒜（Alliaria petiolata）和共同存在的天然药草锦葵（Geum vernum）对因子分解环境中升高的春季温度和大气CO 2 条件的生长和生理响应生长室实验。关键结果：在5周时，两个物种的叶片均在高温下变大，并且仅在高温下CO 2 升高时茎生物量增加。随着温度逐渐变暖以模拟季节变化，在两种温度下，藜变种都对CO 2 产生响应，而油桐仅在高温下才对CO 2 升高做出响应。 。升高的CO 2 增加了两种物种的叶片厚度并降低了氮含量。大蒜小蒜在CO 2 升高时表现出光合作用的下调，而高温时绿唇藜的光合作用增强。在升高的CO 2 和温度处理下，A。petiolata叶片中的类黄酮和氰化物浓度显着降低。各处理中总芥子油苷浓度和胰蛋白酶抑制剂活性没有变化。结论：未来升高的春季温度和CO 2 会相互作用，从而刺激矮牵牛和Ver。vernum的生长，但可能会降低矮牵牛的化感作用。

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