Global convergence in the balance between leaf water supply and demand across vascular land plants
Global convergence in the balance between leaf water supply and demand across vascular land plants
复制标题
维管植物叶片水分供需平衡的全球趋同
DOI：
10.1071/fp19101
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发表时间：
2020
影响因子：
3
通讯作者：
Kun-fang Cao
中科院分区：
文献类型：
--
作者：
Yin Wen;Wanli Zhao;Kun-fang Cao
在现代被子植物和蕨类植物的叶子中发现了脉（供水）和气孔（对水的需求）密度之间的协调。这表明，这种协调发展不是一个独特的适应派生被子植物，使他们的高生产力。为了验证这一点，我们收集了520种陆生维管植物的叶脉和气孔密度数据，包括派生被子植物、基生被子植物、裸子植物和蕨类植物。我们发现，在维管陆生植物的全球协调，虽然在裸子植物和无导管被子植物的关系并不显着。通过比较植物谱系中木质部导管分子的演化与脉和气孔密度以及理论气孔导度的变化，我们发现现代被子植物的生理优势与导管内阻力低的木质部和脉和气孔密度高的叶片的出现有关。因此，我们的研究结果表明两个主要事件与被子植物木质部水力能力激增：（1）导管的起源和（2）出现的导管与简单的穿孔板，这减少了物理限制气孔导度。这些进化的创新可能使衍生的被子植物更有生产力和适应不断变化的气候。
Coordination between the density of veins (water supply) and stomata (demand for water) has been found in the leaves of modern angiosperms and also in ferns. This suggests that this coordinated development is not a unique adaptation of derived angiosperms that enables their high productivity. To test this, we compiled leaf vein and stomatal density data from 520 land vascular plant species including derived angiosperms, basal angiosperms, gymnosperms and ferns. We found global coordination across vascular land plants, although the relationships were not significant in gymnosperms and vessel-less angiosperms. By comparing the evolution of xylem conduit elements with variation in the density of veins and stomata and theoretical stomatal conductance among plant lineages, we found that the physiological advantage of modern angiosperms is associated with the emergence of xylem with low intraconduit resistance and leaves with high vein and stomata densities. Thus our results indicate two major events associated with surges in xylem hydraulic capacity in angiosperms: (1) the origin of vessels and (2) the emergence of vessels with simple perforation plates, which diminished physical limitations on stomatal conductance. These evolutionary innovations may have enabled derived angiosperms to be more productive and adaptive to the changing climate.