Phenotypic and genetic differences in a perennial herb across a natural gradient of CO_2 concentration
Phenotypic and genetic differences in a perennial herb across a natural gradient of CO_2 concentration
复制标题
多年生草本植物在 CO_2 浓度自然梯度下的表型和遗传差异
DOI：
10.1007/s00442-010-1900-1
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发表时间：
2011
期刊：
影响因子：
2.7
通讯作者：
Hikosaka K
中科院分区：
文献类型：
--
作者：
Nakamura I;Onoda Y;Matsushima N;Yokoyama J;Kawata M;Hikosaka K
自工业革命以来，大气中的二氧化碳浓度一直在显著增加，预计到本世纪末将达到500-1,000μ−。尽管对高二氧化碳的短期和适应反应已经有了很好的研究，但对高[二氧化碳]的进化反应的了解要少得多。我们研究了天然二氧化碳泉周围的车前草种群的表型和遗传差异，那里的[二氧化碳]在进化时间尺度上一直很高。我们的普通花园实验表明，从[CO2]较高的生境转移过来的植物具有较高的相对生长速率、较大的叶根比、较低的光合作用速率和较低的气孔导度。这种与生境相关的差异部分是可遗传的，因为它们的后代中发现了相似的叶根比趋势。遗传分析表明，自交或双亲近亲交配可能会促进高[CO2]地区的局部适应，尽管[CO2]梯度上有大量的基因流动。这些结果表明，高[CO2]种群和正常[CO2]种群之间存在表型和遗传差异。
The atmospheric CO2concentration [CO2] has been increasing markedly since the industrial revolution and is predicted to reach 500–1,000 μmol mol−1by the end of this century. Although the short-term and acclimatory responses to elevated [CO2] have been well studied, much less is understood about evolutionary responses to high [CO2]. We studied phenotypic and genetic differences inPlantago asiaticapopulations around a natural CO2spring, where [CO2] has been consistently high over an evolutionary time scale. Our common-garden experiment revealed that plants transferred from habitats with higher [CO2] had higher relative growth rates, greater leaf to root ratios, lower photosynthetic rates, and lower stomatal conductance. The habitat-dependent differences were partly heritable because a similar trend of leaf to root ratio was found among their offsprings. Genetic analyses indicated that selfing or biparental inbreeding might promote local adaptation in areas with high [CO2] despite substantial gene flow across the [CO2] gradient. These results indicate that phenotypic and genetic differences have occurred between high and normal [CO2] populations.