Quantitative analysis of the diverse three-dimensional shapes of the corolla and their association with the regulation of petal cell expansion

摘要以洋桔梗为材料，研究了花瓣生长方式与花冠三维形态形成之间的关系。在花瓣的远端区域表现出向外弯曲的品种在花开放的后期阶段表现出快速的远端加宽，而杯形品种在花发育的早期阶段表现出快速加宽的花瓣的基部至中部区域。在漏斗形的品种，没有明显的曲率，没有区域差异的花瓣扩展被发现。数据表明，不均匀的细胞扩展在花瓣内的结果导致花瓣扭曲，这在花冠曲率的形成中起着核心作用。

Associations between petal growth patterns and the formation of three-dimensional corolla shapes were investigated in Eustoma grandiflorum. The cultivars showing outward curvature in the distal regions of petals exhibited a rapid distal widening during the later stages of flower opening, whereas the cup-shaped cultivars exhibited a rapid widening in the basal to middle regions of petals during earlier stages of flower development. In a funnel-shaped cultivar showing no apparent curvature, no regional differences in petal expansion were found. The data suggested that non-uniform cell expansion within a petal results in petal distortion, and this plays a central role in corolla curvature formation.