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Genetic analysis of early phenology in lentil identifies distinct loci controlling component traits

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Rajandran, V, Ortega, R ORCID: 0000-0001-5827-6630, Vander Schoor, JK, Butler, JB ORCID: 0000-0003-1353-3765, Freeman, JS ORCID: 0000-0003-1166-9976, Hecht, VFG ORCID: 0000-0002-3539-3356, Erskine, W, Murfet, IC, Bett, KE and Weller, JL ORCID: 0000-0003-2423-8286 2022 , 'Genetic analysis of early phenology in lentil identifies distinct loci controlling component traits' , Journal of Experimental Botany , erac107 , doi: 10.1093/jxb/erac107.

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Abstract

Modern-day domesticated lentil germplasm is generally considered to form three broad adaptation groups: Mediterranean, South Asian and northern temperate, which correspond to the major global production environments. Reproductive phenology plays a key role in lentil adaptation to this diverse ecogeographic variation. Here, we dissect the characteristic earliness of the pilosae ecotype, suited to the typically short cropping season of South Asian environments. We identified two loci, DTF6a and DTF6b, at which dominant alleles confer early flowering, and we show that DTF6a alone is sufficient to confer early flowering under extremely short photoperiods. Genomic synteny confirmed the presence of a conserved cluster of three florigen (FT) gene orthologs among potential candidate genes, and expression analysis in near-isogenic material showed that the early allele is associated with a strong derepression of the FTa1 gene in particular. Sequence analysis revealed a 7.4 kb deletion in the FTa1-FTa2 intergenic region in the pilosae parent, and a wide survey of over 350 accessions with diverse origin showed that the dtf6a allele is predominant in South Asian material. Collectively, these results contribute to understanding the molecular basis of global adaptation in lentil, and further emphasize the importance of this conserved genomic region for adaptation in temperate legumes generally.

Item Type: Article
Authors/Creators:Rajandran, V and Ortega, R and Vander Schoor, JK and Butler, JB and Freeman, JS and Hecht, VFG and Erskine, W and Murfet, IC and Bett, KE and Weller, JL
Keywords: adaptation, controlled environment, flowering time, FT genes, photoperiod, legume, lentil, mapping, QTL analysis, florigen, lentil, phenology
Journal or Publication Title: Journal of Experimental Botany
Publisher: Oxford Univ Press
ISSN: 0022-0957
DOI / ID Number: 10.1093/jxb/erac107
Copyright Information:

© The Author(s) 2022. This is a pre-copyedited, author-produced version of an article accepted for publication in Journal of Experimental Botany following peer review. The version of record, Vinodan Rajandran, Raul Ortega, Jacqueline K Vander Schoor, Jakob B Butler, Jules S Freeman, Valerie F G Hecht, Willie Erskine, Ian C Murfet, Kirstin E Bett, James L Weller, Genetic analysis of early phenology in lentil identifies distinct loci controlling component traits, Journal of Experimental Botany, 2022, erac107, is available online at: https://doi.org/10.1093/jxb/erac107

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