CREAF, Cerdanyola del Valles, Barcelona, 08193, Spain.
Universitat Autònoma de Barcelona, Cerdanyola del Valles, Barcelona, 08193, Spain.
Ecol Lett. 2020 Nov;23(11):1599-1610. doi: 10.1111/ele.13584. Epub 2020 Aug 18.
Hydraulic properties control plant responses to climate and are likely to be under strong selective pressure, but their macro-evolutionary history remains poorly characterised. To fill this gap, we compiled a global dataset of hydraulic traits describing xylem conductivity (K ), xylem resistance to embolism (P50), sapwood allocation relative to leaf area (Hv) and drought exposure (ψ ), and matched it with global seed plant phylogenies. Individually, these traits present medium to high levels of phylogenetic signal, partly related to environmental selective pressures shaping lineage evolution. Most of these traits evolved independently of each other, being co-selected by the same environmental pressures. However, the evolutionary correlations between P50 and ψ and between K and Hv show signs of deeper evolutionary integration because of functional, developmental or genetic constraints, conforming to evolutionary modules. We do not detect evolutionary integration between conductivity and resistance to embolism, rejecting a hardwired trade-off for this pair of traits.
水力特性控制植物对气候的响应，并且可能受到强烈的选择压力，但它们的宏观进化历史仍未得到充分描述。为了填补这一空白，我们编译了一个全球水力性状数据集，描述了木质部导度 (K)、木质部栓塞阻力 (P50)、相对于叶面积的边材分配 (Hv) 和干旱暴露 (ψ)，并将其与全球种子植物系统发育相匹配。单独来看，这些性状具有中等到高水平的系统发育信号，部分与塑造谱系进化的环境选择压力有关。这些性状大多数彼此独立进化，被相同的环境压力共同选择。然而，P50 和 ψ 之间以及 K 和 Hv 之间的进化相关性显示出更深层次的进化整合的迹象，这是由于功能、发育或遗传限制，符合进化模块。我们没有检测到导度和栓塞阻力之间的进化整合，从而否定了这一对性状之间的硬性权衡。
