Knowledge about the diversity in the morphological characteristics of robusta coffee (Coffea canephora Pierre ex Froehner) flowers is fundamental to understanding reproduction processes, interpret pollination-related mechanisms, and contribute to breeding studies. The objective of this study was to analyze and characterize morphological variability of flower traits among robusta coffee cultivar Conilon genotypes of high agronomic performance. The experiment was arranged in a randomized block, split-plot design. The main plot corresponded to six Conilon coffee genotypes and the subplots to 2 yr of evaluation (2018 and 2019). Eight floral traits were measured and analyzed through analysis of variance by the F test (<.01), Tocher's optimization method and hierarchical Unweighted Pair Group Method using Arithmetic Averages (UPGMA) clustering. The relative importance of each character was also estimated to predict genetic diversity, and the degree of trait interrelation was assessed by Spearman's correlation. Genotype Pirata had outstanding floral morphological structure and was grouped separately by Tocher and UPGMA clustering. Style length was the major contributor to genetic diversity, followed by the lengths of the corolla tube and stigmatic lobes. The flower trait characteristics were positively correlated, and corolla tube length and style length were most strongly correlated. These results contribute to other studies related to the interpretation of the mechanisms related to pollination and reproduction of this species, and also outline diversity of genetic resources of interest to plant-breeding programs.

中文翻译：

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罗布斯塔咖啡基因型的花卉形态

了解罗布斯塔咖啡（Coffea canephora Pierre ex Froehner）花的形态特征多样性是理解繁殖过程、解释授粉相关机制和育种研究的基础。本研究的目的是分析和表征具有高农艺性能的罗布斯塔咖啡品种 Conilon 基因型中花卉性状的形态变异性。实验采用随机区组、裂区设计。主图对应六个 Conilon 咖啡基因型，子图对应 2 年的评估（2018 年和 2019 年）。进行测量和通过由方差分析八个花性状˚Ftest (<.01)、Tocher 的优化方法和使用算术平均 (UPGMA) 聚类的分层未加权对组方法。还估计每个性状的相对重要性以预测遗传多样性，并且通过 Spearman 相关性评估性状相互关联的程度。基因型 Pirata 具有突出的花形态结构，通过 Tocher 和 UPGMA 聚类分别分组。花柱长度是遗传多样性的主要贡献者，其次是花冠筒和柱头裂片的长度。花性状特征呈正相关，花冠筒长与花柱长度相关性最强。这些结果有助于其他与该物种授粉和繁殖相关机制的解释相关的研究，