Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.

<h4>Background</h4>Pearl millet landraces display an important variation in their cycle duration. This diversity contributes to the stability of crop production in the Sahel despite inter-annual rainfall fluctuation. Conservation of phenological diversity is important for the future of p...

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Autores principales:	Ghayas Lakis, Miguel Navascués, Samah Rekima, Mathieu Simon, Marie-Stanislas Remigereau, Magalie Leveugle, Najat Takvorian, Françoise Lamy, Frantz Depaulis, Thierry Robert
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d6f14a41e587496e9ae4332435e7b4aa
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spelling	oai:doaj.org-article:d6f14a41e587496e9ae4332435e7b4aa2021-11-18T07:18:49ZEvolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.1932-620310.1371/journal.pone.0036642https://doaj.org/article/d6f14a41e587496e9ae4332435e7b4aa2012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22606277/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Pearl millet landraces display an important variation in their cycle duration. This diversity contributes to the stability of crop production in the Sahel despite inter-annual rainfall fluctuation. Conservation of phenological diversity is important for the future of pearl millet improvement and sustainable use. Identification of genes contributing to flowering time variation is therefore relevant. In this study we focused on three flowering candidate genes, PgHd3a, PgDwarf8 and PgPHYC. We tested for signatures of past selective events within polymorphism patterns of these three genes that could have been associated with pearl millet domestication and/or landraces differentiation. In order to implement ad hoc neutrality tests, a plausible demographic history of pearl millet domestication was inferred through Approximate Bayesian Computation by using eight neutral STS loci.<h4>Results</h4>Domesticated pearl millet exhibited 84% of the nucleotide diversity level found in the wild population. No specific polymorphisms were found either in the wild or in the domestic populations. The bayesian approach and previous studies suggest that gene flow between wild relatives and domesticated pearl millets is a main factor explaining these results. Early and late landraces did not show significant genetic differentiation at both the neutral and the candidate loci. A positive selection was evidenced in PgHd3a and PgDwarf8 genes of domestic forms but not in the wild population.<h4>Conclusion</h4>Our results strongly suggest that PgHd3a and PgDwarf8 were likely targeted by selection during domestication. However, a potential role of any of the three candidate genes in the phenological differentiation between early and late landraces was not supported by our data. Reasons why these results contrast with previous results that have shown a slight but significant association between PgPHYC polymorphisms and variation in flowering time in pearl millet are discussed.Ghayas LakisMiguel NavascuésSamah RekimaMathieu SimonMarie-Stanislas RemigereauMagalie LeveugleNajat TakvorianFrançoise LamyFrantz DepaulisThierry RobertPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 5, p e36642 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ghayas Lakis Miguel Navascués Samah Rekima Mathieu Simon Marie-Stanislas Remigereau Magalie Leveugle Najat Takvorian Françoise Lamy Frantz Depaulis Thierry Robert Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.
description	<h4>Background</h4>Pearl millet landraces display an important variation in their cycle duration. This diversity contributes to the stability of crop production in the Sahel despite inter-annual rainfall fluctuation. Conservation of phenological diversity is important for the future of pearl millet improvement and sustainable use. Identification of genes contributing to flowering time variation is therefore relevant. In this study we focused on three flowering candidate genes, PgHd3a, PgDwarf8 and PgPHYC. We tested for signatures of past selective events within polymorphism patterns of these three genes that could have been associated with pearl millet domestication and/or landraces differentiation. In order to implement ad hoc neutrality tests, a plausible demographic history of pearl millet domestication was inferred through Approximate Bayesian Computation by using eight neutral STS loci.<h4>Results</h4>Domesticated pearl millet exhibited 84% of the nucleotide diversity level found in the wild population. No specific polymorphisms were found either in the wild or in the domestic populations. The bayesian approach and previous studies suggest that gene flow between wild relatives and domesticated pearl millets is a main factor explaining these results. Early and late landraces did not show significant genetic differentiation at both the neutral and the candidate loci. A positive selection was evidenced in PgHd3a and PgDwarf8 genes of domestic forms but not in the wild population.<h4>Conclusion</h4>Our results strongly suggest that PgHd3a and PgDwarf8 were likely targeted by selection during domestication. However, a potential role of any of the three candidate genes in the phenological differentiation between early and late landraces was not supported by our data. Reasons why these results contrast with previous results that have shown a slight but significant association between PgPHYC polymorphisms and variation in flowering time in pearl millet are discussed.
format	article
author	Ghayas Lakis Miguel Navascués Samah Rekima Mathieu Simon Marie-Stanislas Remigereau Magalie Leveugle Najat Takvorian Françoise Lamy Frantz Depaulis Thierry Robert
author_facet	Ghayas Lakis Miguel Navascués Samah Rekima Mathieu Simon Marie-Stanislas Remigereau Magalie Leveugle Najat Takvorian Françoise Lamy Frantz Depaulis Thierry Robert
author_sort	Ghayas Lakis
title	Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.
title_short	Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.
title_full	Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.
title_fullStr	Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.
title_full_unstemmed	Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.
title_sort	evolution of neutral and flowering genes along pearl millet (pennisetum glaucum) domestication.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/d6f14a41e587496e9ae4332435e7b4aa
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Evolution of neutral and flowering genes along pearl millet (Pennisetum glaucum) domestication.

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