Leaves and sporangia developed in rare non-Fibonacci spirals in early leafy plants.
Leaves and sporangia developed in rare non-Fibonacci spirals in early leafy plants.
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在早期叶植物中，叶子和孢子囊以罕见的非斐波那契螺旋形式发育。
DOI：
10.1126/science.adg4014
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Turner HA
中科院分区：
文献类型：
--
作者：
Turner HA
侧生植物器官，包括叶片和生殖结构，以不同的方式排列在茎上，称为叶序。大多数现存的植物都表现出斐波纳契数列所描述的叶系模式。然而，目前尚不清楚早期多叶植物中存在哪些侧向器官排列。为了研究这一点，我们量化了早泥盆世石龙化石中的叶序。我们报告了叶中不同的叶序，包括轮生和螺旋。螺旋均为n：(n+1)非斐波那契型。我们还表明，叶片和生殖结构出现在同一叶系中，表明器官之间的发育相似。我们的发现揭示了关于叶子起源的长期争论，并证明了植物中非斐波纳契螺旋的古老。
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 lycopodAsteroxylon 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.