叶序
斐波纳契数
多叶的
生物
现存分类群
孢子囊
植物
泥盆纪
进化生物学
古生物学
分生组织
数学
孢子
离散数学
开枪
作者
Holly-Anne Turner,Matthew Humpage,Hans Kerp,Alexander J. Hetherington
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2023-06-16
卷期号:380 (6650): 1188-1192
被引量:2
标识
DOI:10.1126/science.adg4014
摘要
Lateral plant organs, including leaves and reproductive structures, are arranged on stems in distinct patterns termed phyllotaxis. Most extant plants exhibit phyllotactic patterns that are mathematically described by the Fibonacci series. However, it remains unclear what lateral organ arrangements were present in early leafy plants. To investigate this, we quantified phyllotaxis in fossils of the Early Devonian lycopod Asteroxylon mackiei . We report diverse phyllotaxis in leaves, including whorls and spirals. Spirals were all n:(n+1) non-Fibonacci types. We also show that leaves and reproductive structures occurred in the same phyllotactic series, indicating developmental similarities between the organs. Our findings shed light on the long-standing debate about leaf origins and demonstrate the antiquity of non-Fibonacci spirals in plants.
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