Jinfeng Wang, Peijian Shi, Weihao Yao, Lin Wang, Qiying Li, Rui Tan, Karl J. Niklas
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引用次数: 0
Key message
A significant scaling relationship between the perianth mass and area was detected using 306 flowers of Magnolia × soulangeana, and increases in mass failed to achieve proportional increases in area.
Abstract
The scaling relationship between leaf lamina mass and area has been explored extensively. However, this relationship for floral parts, which are considered homologous with foliage leaves, has not been studied despite the implications of scaling theory and plant morphometry. Toward this goal, a total of 306 flowers and 2759 tepals of Magnolia × soulangeana were collected and measured. The area of each tepal was determined by digitizing its profile, and the perianth area (Ap) was empirically determined by summing the areas of all tepals per flower. The perianth fresh mass (FM) was also measured, and the Montgomery equation (ME) was used to estimate the tepal area (At) predicted as proportional to the product of tepal length (L) and width (W) to explore the feasibility of estimating At non-destructively. The scaling exponent of FM vs Ap significantly exceeded unity, i.e., increases in mass failed to achieve proportional increases in area, a phenomenon called “diminishing returns”. The estimated proportionality coefficient of ME for non-destructively calculating At approximately equaled 0.7 [i.e., At ≈ (3/4)LW], and the distributions of At, L, W/L, and the tepal centroid ratio were relatively concentrated. The data indicate that (1) scaling relationship between tepal mass and area is statistically indistinguishable from the phenomenon observed for foliage leaves, (2) tepal shape and leaf shape are similar, and (3) the ME predicts tepal area nondestructively. These results encourage the application of the ME to study tepal shape and geometry and support the serial homology between leaves and tepals for this Magnolia hybrid.
摘要 叶片质量和面积之间的比例关系已被广泛探讨。然而，尽管缩放理论和植物形态计量学具有一定的意义，但对被认为与叶片同源的花部的这种关系还没有进行过研究。为了实现这一目标，我们收集并测量了木兰花 × soulangeana 的 306 朵花和 2759 枚花被片。每个花被片的面积是通过数字化其轮廓确定的，而花被面积（Ap）则是通过将每朵花的所有花被片面积相加得出的。此外，还测量了花被新鲜质量（FM），并使用蒙哥马利方程（ME）估算了与花被长度（L）和宽度（W）的乘积成正比的花被面积（At），以探索非破坏性估算 At 的可行性。FM 与 Ap 的比例指数明显超过了统一值，即质量的增加无法实现面积的成比例增加，这种现象被称为 "收益递减"。非破坏性计算 At 时 ME 的估计比例系数约等于 0.7 [即 At ≈ (3/4)LW]，At、L、W/L 和表心比的分布相对集中。数据表明：(1) 花被片质量与面积之间的比例关系在统计学上与叶片上观察到的现象没有区别；(2) 花被片形状与叶片形状相似；(3) ME 可以非破坏性地预测花被片面积。这些结果鼓励应用 ME 研究花被片的形状和几何形状，并支持这种白玉兰杂交种的叶片和花被片之间的序列同源性。
期刊介绍：
Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.
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