Structural and defensive roles of angiosperm leaf venation network reticulation across an Andes-Amazon elevation gradient
Structural and defensive roles of angiosperm leaf venation network reticulation across an Andes-Amazon elevation gradient
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DOI：
10.1111/1365-2745.12945
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发表时间：
2018-07-01
影响因子：
5.5
通讯作者：
Malhi, Yadvinder
中科院分区：
文献类型：
--
作者：
Blonder, Benjamin;Salinas, Norma;Malhi, Yadvinder
1.被子植物叶的小脉网络可能包括环（网状）。网络结构的变化被假设为具有水力功能以及结构和防御功能。我们测量了在秘鲁东南部沿沿着3,300 m海拔梯度的136个生物量占优势的被子植物树种的8个维度的脉序网络特征空间。然后，我们研究了多个生态和进化预测的相对重要性。小脉序网络的变化被限制在三个轴上。这些轴描述了重新连接与分支静脉，细长与紧凑的小蜂窝紧凑与细长和低密度与高密度静脉。前两个轴的变异是由机械强度和次生化合物相关性状预测的，第三个轴的变异是由立地温度预测的.合成.防御性和结构性因素主要解释了网状结构多轴的变化，与气候相关的因素作用较小。这些结果表明，脉序网络的网状结构可能更多地取决于物种间的相互作用，而不是水力功能。
1. The network of minor veins of angiosperm leaves may include loops (reticulation). Variation in network architecture has been hypothesized to have hydraulic and also structural and defensive functions.2. We measured venation network trait space in eight dimensions for 136 biomass-dominant angiosperm tree species along a 3,300 m elevation gradient in southeastern Peru. We then examined the relative importance of multiple ecological and evolutionary predictors of reticulation.3. Variation in minor venation network reticulation was constrained to three axes. These axes described reconnecting vs. branching veins, elongated vs. compact areoles compact vs. elongated and low vs. high-density veins. Variation in the first two axes was predicted by traits related to mechanical strength and secondary compounds, and in the third axis by site temperature.4. Synthesis. Defensive and structural factors primarily explain variation in multiple axes of reticulation, with a smaller role for climate-linked factors. These results suggest that venation network reticulation may be determined more by species interactions than by hydraulic functions.