目标:每个分支节间,和上面生长的器官,可以看作是一个单一的形态植物亚基,由结构上和功能上相互关联的组件组成。然而,这些亚基的解剖结构和形态之间的异速关系仍不清楚,特别是在轴向的背景下。这项研究旨在解决这一知识差距,通过测量形态解剖学参数及其沿葡萄芽的异速关系。
方法:为了便于比较,将枝条长度归一化,并计算每个节间的相对位置指数,范围从基部的0到顶点的1。沿着轴的形态解剖参数之间的缩放关系被开发并通过统计建模进行验证。
结果:大多数形态解剖学参数显示出从基部到顶点大小增加然后减小的轴向行为,除了芽直径和芽血管密度。0.2的相对位置指数是大多数分析变量的数据转折点。在第一阶段(相对位置指数低于0.2),植物器官性状是分离的,表现出弱的异速相关性,在第二阶段,这些性状具有很强的异形关系。
结论:我们的发现表明,沿着葡萄树芽的异速关系不是恒定的-它们表现出双峰模式,可能受到季节性温度的影响。这项工作可以帮助管理全球气候变化下农业和自然系统的生产力变化,并增加植物生长单位分化和发展的基本知识。
OBJECTIVE: Each branch internode, and the organs growing on it, can be seen as a single morphological phytomer subunit, made of structurally and functionally interrelated components. However, allometric relationships between anatomy and morphology of these subunits remain unclear, particularly in the axial context. This study aims to address this knowledge gap, by measuring morpho-anatomical parameters and their allometric relationships along grapevine shoots.
METHODS: To facilitate comparison, shoot length was normalized and a relative position index was calculated for each internode, ranging from 0 at the base to 1 at the apex. Scaling relationships between morpho-anatomical parameters along the axis were developed and validated by statistical modeling.
RESULTS: Most morpho-anatomical parameters displayed an axial behaviour of increasing then decreasing in size from base to apex, with the exception of shoot diameter and shoot vessel density. Relative position index of 0.2 acted as the data turning point for most variables analysed. During the first phase (relative position index below 0.2), the phytomer organs traits are uncoupled and show weak allometric correlation, and during the second phase the traits are strongly allometrically related.
CONCLUSIONS: Our findings suggest that allometric relationships along grapevine shoots are not constant- they exhibit a bimodal pattern, possibly influenced by seasonal temperatures. This work could aid managing productivity shifts in agricultural and natural systems under global climate change and add to basic knowledge of differentiation and development of growth units in plants.