Open AccessExtraordinary accuracy in floret position of Helianthus annuus
Author(s) -
Takuya Okabe
Publication year - 2015
Publication title -
acta societatis botanicorum poloniae
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 29
eISSN - 2083-9480
pISSN - 0001-6977
DOI - 10.5586/asbp.2015.007
Subject(s) - phyllotaxis , helianthus annuus , divergence (linguistics) , ideal (ethics) , botany , mathematics , position (finance) , biology , sunflower , horticulture , linguistics , philosophy , epistemology , shoot , meristem , finance , economics
Divergence angles were measured for inorescences of Helianthus annuus with several hundreds to more than a thousand disk owers. Quantitative analysis showed that the angles are robustly xed in the vicinity of the ideal golden angle 137.508° as accurately as ~0.001°. The mean deviation from the ideal value varies for each sample. The results have important implications for phyllotaxis models, which are discussed by referring to a necessary modication proposed by Roberts