Genome-Based Identification of Heterotic Patterns in Rice

Rice
Ulrike BeukertJochen C Reif

Abstract

Hybrid rice breeding facilitates to increase grain yield and yield stability. Long-term success of hybrid breeding depends on the recognition of high-yielding complementary heterotic patterns, which is lacking in crops like rice. The main goal of this study was to evaluate the potential and limits to use genomics for establishing heterotic patterns in rice. For this purpose, data of a commercial hybrid rice breeding program targeted to India was analyzed, including 1,960 phenotyped hybrids from three market segments and 262 genotyped parental lines. Our cross-validation study revealed that grain yield of all potential single-crosses can be accurately predicted. Based on the full matrix of hybrid performances, high-yielding heterotic patterns were identified. These heterotic patterns increased grain yield up to 9% compared to the currently employed groups. Heterotic groups of around 14 individuals reflect a good compromise between long-term and short-term selection response. Our findings clearly underlined the benefits of a genome-based establishment of heterotic patterns in rice as a requirement for a sustainable long-term success of hybrid rice breeding.

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Citations

Nov 2, 2018·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Danilo Hottis LyraRoberto Fritsche-Neto
Sep 3, 2020·Plant Biotechnology Journal·Abhishek BohraRajeev Kumar Varshney
Feb 13, 2021·Scientific Reports·Hongbo PangXiaoming Zheng
Mar 16, 2021·Frontiers in Genetics·Marlee R LabrooJessica E Rutkoski

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Methods Mentioned

BETA
genotyping

Software Mentioned

R
R Core
ASReml

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