Genetic Loci Governing Androgenic Capacity in Perennial Ryegrass (Lolium perenne L.)
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Date
2018-06-01
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Journal Article
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yes
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Abstract
Immature pollen can be induced to switch developmental pathways from gametogenesis to embryogenesis and subsequently regenerate into homozygous, diploid plants. Such androgenic production of doubled haploids is particularly useful for species where inbreeding is hampered by effective self-incompatibility systems. Therefore, increasing the generally low androgenic capacity of perennial ryegrass (Lolium perenne L.) germplasm would enable the efficient production of homozygous plant material, so that a more effective exploitation of heterosis through hybrid breeding schemes can be realized. Here, we present the results of a genome-wide association study in a heterozygous, multiparental population of perennial ryegrass (n = 391) segregating for androgenic capacity. Genotyping-by-sequencing was used to interrogate gene- dense genomic regions and revealed over 1,100 polymorphic sites. Between one and 10 quantitative trait loci (QTL) were identified for anther response, embryo and total plant production, green and albino plant production and regeneration. Most traits were under polygenic control, although a major QTL on linkage group 5 was associated with green plant regeneration. Distinct genetic factors seem to affect green and albino plant recovery. Two intriguing candidate genes, encoding chromatin binding domains of the developmental phase transition regulator, Polycomb Repressive Complex 2, were identified. Our results shed the first light on the molecular mechanisms behind perennial ryegrass microspore embryogenesis and enable marker-assisted introgression of androgenic capacity into recalcitrant germplasm of this forage crop of global significance.
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Publication status
published
Editor
Book title
Journal / series
G3
Volume
8 (6)
Pages / Article No.
1897 - 1908
Publisher
Genetics Society of America
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Date collected
Date created
Subject
Anther culture (AC); Doubled haploid (DH); Perennial ryegrass (Lolium perenne L.); Genome-wide association studies (GWAS); Microspore embryogenesis (ME); Multipareental populations
Organisational unit
03969 - Studer, Bruno / Studer, Bruno
Notes
Funding
138983 - FUNCTIONAL GENOMICS OF GRASS REPRODUCTIVE TRAITS (SNF)