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Research Article | Open Access

Phenotyping of Silique Morphology in Oilseed Rape Using Skeletonization with Hierarchical Segmentation

Zhihong Ma1,2, Ruiming Du1,2, Jiayang Xie1,2, Dawei Sun1,2, Hui Fang1,2, Lixi Jiang3, Haiyan Cen1,2( )
College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, P.R. China
Key Laboratory of Spectroscopy Sensing, Ministry of Agriculture and Rural Affairs, Hangzhou 310058, P.R. China
Institute of Crop Science and Zhejiang Key Laboratory of Crop Germplasm, Zhejiang University, Hangzhou 310058, P.R. China
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Abstract

Silique morphology is an important trait that determines the yield output of oilseed rape (Brassica napus L.). Segmenting siliques and quantifying traits are challenging because of the complicated structure of an oilseed rape plant at the reproductive stage. This study aims to develop an accurate method in which a skeletonization algorithm was combined with the hierarchical segmentation (SHS) algorithm to separate siliques from the whole plant using 3-dimensional (3D) point clouds. We combined the L1-median skeleton with the random sample consensus for iteratively extracting skeleton points and optimized the skeleton based on information such as distance, angle, and direction from neighborhood points. Density-based spatial clustering of applications with noise and weighted unidirectional graph were used to achieve hierarchical segmentation of siliques. Using the SHS, we quantified the silique number (SN), silique length (SL), and silique volume (SV) automatically based on the geometric rules. The proposed method was tested with the oilseed rape plants at the mature stage grown in a greenhouse and field. We found that our method showed good performance in silique segmentation and phenotypic extraction with R2 values of 0.922 and 0.934 for SN and total SL, respectively. Additionally, SN, total SL, and total SV had the statistical significance of correlations with the yield of a plant, with R values of 0.935, 0.916, and 0.897, respectively. Overall, the SHS algorithm is accurate, efficient, and robust for the segmentation of siliques and extraction of silique morphological parameters, which is promising for high-throughput silique phenotyping in oilseed rape breeding.

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Plant Phenomics
Volume 5,
2023
Article number: 0027
DOI: 10.34133/plantphenomics.0027
Cite this article:
Ma Z, Du R, Xie J, et al. Phenotyping of Silique Morphology in Oilseed Rape Using Skeletonization with Hierarchical Segmentation. Plant Phenomics, 2023, 5: 0027. https://doi.org/10.34133/plantphenomics.0027

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Received: 16 October 2022
Accepted: 03 February 2023
Published: 15 March 2023
© 2023 Zhihong Ma et al. Exclusive licensee Nanjing Agricultural University. No claim to original U.S. Government Works.

Distributed under a Creative Commons Attribution License (CC BY 4.0).
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