Passive Origins of Stomatal Control in Vascular Plants
Passive Origins of Stomatal Control in Vascular Plants
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DOI：
10.1126/science.1197985
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发表时间：
2011-02-04
期刊：
影响因子：
56.9
通讯作者：
McAdam, Scott A. M.
中科院分区：
文献类型：
--
作者：
Brodribb, Tim J.;McAdam, Scott A. M.
植物与大气之间的碳和水的流动是由叶片表面微小的气孔的开闭来调节的。通过改变气孔的孔径，植物根据许多环境刺激来调节水分流失和光合碳获取，但气孔运动还无法可靠地预测。我们发现，在早期分化的维管植物谱系中不存在种子植物气孔控制所具有的复杂性。石松类植物和蕨类植物的气孔被证明缺乏对脱落酸和表皮细胞膨压的关键反应，这使得它们的行为具有高度可预测性。这些结果表明，在大约3.6亿年前蕨类植物分化之后，植物水分平衡发生了从被动到主动代谢控制的根本性转变。
Carbon and water flow between plants and the atmosphere is regulated by the opening and closing of minute stomatal pores in surfaces of leaves. By changing the aperture of stomata, plants regulate water loss and photosynthetic carbon gain in response to many environmental stimuli, but stomatal movements cannot yet be reliably predicted. We found that the complexity that characterizes stomatal control in seed plants is absent in early-diverging vascular plant lineages. Lycophyte and fern stomata are shown to lack key responses to abscisic acid and epidermal cell turgor, making their behavior highly predictable. These results indicate that a fundamental transition from passive to active metabolic control of plant water balance occurred after the divergence of ferns about 360 million years ago.