Modeling Illustrates That Genomic Selection Provides New Opportunities for Intercrop Breeding

JB Bancic, Christian Werner, Chris Gaynor, Gregor Gorjanc, Damaris Achieng Odeny, Henry Ojulong, IK Dawson, SP Hoad, John M Hickey

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
9 Downloads (Pure)

Abstract

Intercrop breeding programs using genomic selection can produce faster genetic gain than intercrop breeding programs using phenotypic selection. Intercropping is an agricultural practice in which two or more component crops are grown together. It can lead to enhanced soil structure and fertility, improved weed suppression, and better control of pests and diseases. Especially in subsistence agriculture, intercropping has great potential to optimise farming and increase profitability. However, breeding for intercrop varieties is complex as it requires simultaneous improvement of two or more component crops that combine well in the field. We hypothesize that genomic selection can significantly simplify and accelerate the process of breeding crops for intercropping. Therefore, we used stochastic simulation to compare four different intercrop breeding programs implementing genomic selection and an intercrop breeding program entirely based on phenotypic selection. We assumed three different levels of genetic correlation between monocrop grain yield and intercrop grain yield to investigate how the different breeding strategies are impacted by this factor. We found that all four simulated breeding programs using genomic selection produced significantly more intercrop genetic gain than the phenotypic selection program regardless of the genetic correlation with monocrop yield. We suggest a genomic selection strategy which combines monocrop and intercrop trait information to predict general intercropping ability to increase selection accuracy in the early stages of a breeding program and to minimize the generation interval.
Original languageEnglish
Article number605172
JournalFrontiers in Plant Science
Volume12
Early online date9 Feb 2021
DOIs
Publication statusFirst published - 9 Feb 2021

Keywords

  • Crop breeding
  • Intercropping
  • Intercrop breeding
  • Genetic simulation
  • Genomic selection
  • Finger millet
  • Phenotype simulation
  • Tropical crops
  • Stochastic simulation
  • Modelling
  • Genetic gain
  • New varieties
  • genomic selection
  • stochastic simulation
  • intercropping ability
  • intercrop breeding program designs
  • sustainable agriculture

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