Phenomic Selection for Hybrid Rapeseed Breeding.

Abstract

Phenomic selection is a recent approach suggested as a low-cost, high-throughput alternative to genomic selection. Instead of using genetic markers, it employs spectral data to predict complex traits using equivalent statistical models. Phenomic selection has been shown to outperform genomic selection when using spectral data that was obtained within the same generation as the traits that were predicted. However, for hybrid breeding, the key question is whether spectral data from parental genotypes can be used to effectively predict traits in the hybrid generation. Here, we aimed to evaluate the potential of phenomic selection for hybrid rapeseed breeding. We performed predictions for various traits in a structured population of 410 test hybrids, grown in multiple environments, using near-infrared spectroscopy data obtained from harvested seeds of both the hybrids and their parental lines with different linear and nonlinear models. We found that phenomic selection within the hybrid generation outperformed genomic selection for seed yield and plant height, even when spectral data was collected at single locations, while being less affected by population structure. Furthermore, we demonstrate that phenomic prediction across generations is feasible, and selecting hybrids based on spectral data obtained from parental genotypes is competitive with genomic selection. We conclude that phenomic selection is a promising approach for rapeseed breeding that can be easily implemented without any additional costs or efforts as near-infrared spectroscopy is routinely assessed in rapeseed breeding.

Plant phenotyping relevance

近赤外分光データを用いた表現型予測を複数モデルで評価し、世代間予測や育種利用可能性を検証しており、表現型取得・抽出手法が研究の中心である。

Code and data availability

The paper's NIRS spectral data, phenotypic trait data, and analysis code are paper-specific but not publicly deposited; the Data Availability Statement directs readers to contact the corresponding author. The only URLs in the text are generic third-party R packages (ParamHelpers, R, ggfortify, ggpubr), which are not作者-

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