Leaf hydraulic evolution led a surge in leaf photosynthetic capacity during early angiosperm diversification
Leaf hydraulic evolution led a surge in leaf photosynthetic capacity during early angiosperm diversification
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DOI：
10.1111/j.1461-0248.2009.01410.x
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发表时间：
2010-02-01
期刊：
影响因子：
8.8
通讯作者：
Feild, Taylor S.
中科院分区：
文献类型：
--
作者：
Brodribb, Tim J.;Feild, Taylor S.
被子植物的进化改变了全球生态，而这种影响在很大程度上来自于优势被子植物支系无与伦比的营养生产力。然而，被子植物高光合作用能力的起源仍不清楚。在这项研究中，我们描述了被子植物叶脉密度(D-v)进化的陡峭轨迹，并预测这种叶片管道的创新使叶片吸收二氧化碳的能力发生了重大转变。从504种被子植物的研究中重建叶脉的进化，我们发现在被子植物的早期进化过程中，D-v迅速增加了三到四倍。我们展示了叶脉结构的这种重大转变如何潜在地允许被子植物的最大光合作用能力超过竞争组140-100 Ma。我们的数据表明，早期陆生被子植物的叶片具有较低的光合作用速率，但随后的被子植物的成功与其早期多样化过程中光合作用能力的激增有关。
Angiosperm evolution transformed global ecology, and much of this impact derives from the unrivalled vegetative productivity of dominant angiosperm clades. However, the origins of high photosynthetic capacity in angiosperms remain unknown. In this study, we describe the steep trajectory of leaf vein density (D-v) evolution in angiosperms, and predict that this leaf plumbing innovation enabled a major shift in the capacity of leaves to assimilate CO2. Reconstructing leaf vein evolution from an examination of 504 angiosperm species we found a rapid three-to fourfold increase in D-v occurred during the early evolution of angiosperms. We demonstrate how this major shift in leaf vein architecture potentially allowed the maximum photosynthetic capacity in angiosperms to rise above competing groups 140-100 Ma. Our data suggest that early terrestrial angiosperms produced leaves with low photosynthetic rates, but that subsequent angiosperm success is linked to a surge in photosynthetic capacity during their early diversification.