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Status of genomic selection in forages
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Presented by Margaret Worthington (CIAT) and Chris Jones (ILRI) at the Workshop on Implementing Genomic Selection in CGIAR Breeding Programs, Montpellier, 10-12 December 2015
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Status of genomic selection in forages
- Status of Genomic Selection in Forages Margaret Worthington (CIAT) and Chris Jones (ILRI) Workshop on Implementing Genomic Selection in CGIAR Breeding Programs, Montpellier, 10-12 December 2015
- Current Status at CIAT • Brachiaria breeding pipeline • Evaluation of testcross progenies (3000 hybrids) • ‘Best bets’ screened for: • Reproductive mode, biotic/abiotic stress & quality (150-200 hybrids) • Forage biomass, seed yield and persistence (~100 hybrids) • Advanced trials (25-30 hybrids) • Grazing trials and seed multiplication (1-3 hybrids) • MAS for apomixis Cultivar Release!!! Yr 3-4 Yr 4-6 Yr 7-8 Yr 9-10
- Opportunities for Genomic Selection • Improved selection accuracy without adding years to the recurrent selection cycle • Selection of sexual mothers for the next cycle of RS currently made after first year spaced plant evaluation • Flowering time selection • Genotypes with inappropriate flowering in advanced trials as not possible to select for in Colombia (0° lat) • Selection of ‘best bet’ hybrids for Africa • Phenotyping the TP across regions Cultivar Release!!! Yr 3-4 Yr 4-6 Yr 7-8 Yr 9-10
- Current Status and Prospects for Genomic Selection at ILRI • Forage genebank • 19,210 accessions (grasses, legumes & fodder trees) • E.g. Napier grass (the most widely grown cut & carry forage) • Extensively phenotyped over a number of years • Morphology, forage biomass, drought tolerance, nutritive value, smut and stunt resistance (KALRO) • Clonally propagated crop • Gene discovery proposal (RNAseq, GBS and AM) • E.g. Lablab (fast growing, high yielding dual purpose crop with wide adaptability and a large amount of variation) • Phentotyped for crop residue (yield and quality) and tradeoff with grain yield
- New Tools and Challenges • Tools: • First saturated genetic maps of Brachiaria spp. by GBS • Markers for apomixis and aluminum resistance • Diploid B.ruziziensis reference genome (with TGAC) • 2015/2016 funding for MatePairs, PacBio reads & annotation • Pearl millet reference genome for Napier grass • Challenges: • Investment in high quality plant phenotyping • Rapid standardized GBS protocols or a SNP platform • Statistical models for heterozygous polyploids • links to RTB crops
- The presentation has a Creative Commons licence. You are free to re-use or distribute this work, provided credit is given to ILRI. better lives through livestock ilri.org
Editor's Notes
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