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Geographic variation in shoot structure in association with fruit size in an evergreen woody species
AoB Plants ( IF 2.9 ) Pub Date : 2021-05-06 , DOI: 10.1093/aobpla/plab023
Takuma Goto 1 , Noriyuki Osada 1
Affiliation  

The generality of scaling relationships between multiple shoot traits, known as Corner’s rules, has been considered to reflect the biomechanical limits to trees and tree organs among the species of different leaf sizes. Variation in fruit size within species would also be expected to affect shoot structure by changing the mechanical and hydraulic stresses caused by the mass and water requirement of fruits. We investigated the differences in shoot structure and their relationship with fruit size in Camellia japonica from 12 sites in a wide geographic range in Japan. This species is known to produce larger fruits with thicker pericarps in more southern populations because warmer climates induce more intensive arms race between the fruit size and the rostrum length of its obligate seed predator. We found that, in association with the change in fruit size, the diameter and mass of 1-year-old stems were negatively associated with latitude, but the total mass and area of 1-year-old leaves did not change with latitude. Consequently, the length of 1-year-old stems and the total mass and area of 1-year-old leaves at a given stem diameter were positively associated with latitude in the allometric relationships. In contrast, the allometric relationships between stem diameter and total mass of the 1-year-old shoot complex (the leaves, stems and fruits that were supported by a 1-year-old stem) did not differ across the trees of different latitudes. Thus, natural selection on fruit size is considered to influence the other traits of Corner’s rules in C. japonica, but all of the traits of Corner’s rules do not necessarily change in a similar manner across latitudinal gradients.

中文翻译:

常绿木本植物枝条结构的地理变异与果实大小的关系

多个枝条性状之间的比例关系的普遍性,称为 Corner 规则,被认为反映了不同叶子大小的物种对树木和树木器官的生物力学限制。预计物种内果实大小的变化也会通过改变由果实的质量和水分需求引起的机械和水力应力来影响枝条结构。我们从日本广泛的地理范围内的 12 个地点调查了山茶的枝条结构差异及其与果实大小的关系。众所周知,该物种在更南部的种群中会产生更大的果实和更厚的果皮,因为温暖的气候会导致果实大小与其专性种子捕食者的嘴长之间的军备竞赛更加激烈。我们发现,随着果实大小的变化,1年生​​茎的直径和质量与纬度呈负相关,但1年生叶的总质量和面积不随纬度变化。因此,在给定的茎直径下,1 年生茎的长度和 1 年生叶的总质量和面积与纬度呈正相关。相比之下,茎直径和 1 年生芽复合体(由 1 年生茎支撑的叶子、茎和果实)的总质量之间的异速生长关系在不同纬度的树木中没有差异。因此,果实大小的自然选择被认为会影响 C. japonica 的 Corner 规则的其他性状,
更新日期:2021-05-06
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