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Quantitative Evaluation of the Floral Shape Variation in Sinningia Speciosa Domestication

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131595052,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Yan-Fu Kuo, Li-Kang Weng, Tzu-Kuei Lee, Hao-Chun Hsu, Ta-Te Lin, Chun-Neng Wang
Keywords:   Floral shape variation Geometric morphometrics Principal component analysis Generalized Procrustes analysis

Abstract. Floral shape variation is of substantial interests to botanists and evolutionary biologists. This study quantifies shape variation in Darwin’s Gloxinia (Sinningia speciosa) using image processing and geometric morphometric methods. Darwin’s Gloxinia has two shape forms – bilateral symmetric (zygomorphic) wild type and radially symmetric (actinomorphic) ornamental breeding (peloria). It is characterized by its easy crossing within its species; hence, is selected to be the study object in this research. In this work, the wild type Darwin’s Gloxinia was crossed with the peloric one. Face and side views of flowers of second-generation hybrids photographed using a regular digital camera. Image processing algorithms were applied to isolate the flowers from the background, and to identify landmarks, i.e., the characteristic points on the flowers. Generalized Procrustes analysis was applied to the landmarks to define floral shapes by excluding their size, rotation, or transformation information. The variation in floral shapes was then investigated by principal component analysis. It was found that the first few principal components captured most structure variations. It is also shown that the proposed approach can adequately capture the shape variation and symmetry in Darwin’s Gloxinia.

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