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The mechanical principles behind the golden ratio distribution of veins in plant leaves.

Abstract：

:Tree leaves are commonly composed of thin mesophyll, carrying out photosynthesis under sunlight, and thick veins. Although the role of leaf veins in water transportation has been known for a long time, their role in providing structural support and guaranteeing large sunlighted area was rarely studied and remains elusive. Here, with use of a novel inverse optimization approach, we aim for uncovering the material design principle behind the unique pattern of venation. It is intriguing to observe that an almost Golden Ratio (GR) distribution of leaf veins always provides optimized structural behavior. Specifically, our research reveals, for the first time, that this unique GR distribution of relatively strong vein material is helpful for maximizing the bending stiffness and leading to a large sunlighted area which is vital for the photosynthesis process of a leaf. Moreover, the GR distribution of leaf veins is also observed in a wide class of plant leaf geometries (i.e., shape, thickness), where experimental evidence is provided for the optimized results. Therefore, our findings can not only serve to explain the mystery of veins GR distribution but also provide widely applicable guidelines on designing soft structures with exceptional mechanical performances.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Sun Z,Cui T,Zhu Y,Zhang W,Shi S,Tang S,Du Z,Liu C,Cui R,Chen H,Guo X

doi

10.1038/s41598-018-31763-1

subject

Has Abstract

pub_date

2018-09-14 00:00:00

pages

13859

issue

1

issn

2045-2322

pii

10.1038/s41598-018-31763-1

journal_volume

8

pub_type

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