Systematic variations in divergence angle

JOURNAL OF THEORETICAL BIOLOGY

卷:313

Article

Okabe, Takuya

关键词: Phyllotaxis;    Logarithmic spiral;    Parastichy lattice;    Helianthus;    Asteraceae;   

DOI  :  10.1016/j.jtbi.2012.08.007

来源: Elsevier

【 摘 要 】

Practical methods for quantitative analysis of radial and angular coordinates of leafy organs of vascular plants are presented and applied to published phyllotactic patterns of various real systems from young leaves on a shoot tip to florets on a flower head. The constancy of divergence angle is borne out with accuracy of less than a degree. It is shown that apparent fluctuations in divergence angle are in large part systematic variations caused by the invalid assumption of a fixed center and/or by secondary deformations, while random fluctuations are of minor importance. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

Free