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Response to early drought stress and identification of QTLs controlling biomass production under drought in pearl millet

OAR@ICRISAT

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Relation http://oar.icrisat.org/10916/
https://doi.org/10.1371/journal.pone.0201635
10.1371/journal.pone.0201635
 
Title Response to early drought stress and identification of QTLs controlling biomass production under drought in pearl millet
 
Creator Debieu, M
Sine, B
Passot, S
Grondin, A
Akata, E
Gangashetty, P I
Vadez, V
Gantet, P
Fonceka, D
Cournac, L
Hash, C T
Kane, N A
Vigouroux, Y
Laplaze, L
 
Subject Drought Tolerance
Pearl Millet
Drylands Agriculture
Drought
Genetics and Genomics
 
Description Pearl millet plays a major role in food security in arid and semi-arid areas of Africa and India. However, it lags behind the other cereal crops in terms of genetic improvement. The recent sequencing of its genome opens the way to the use of modern genomic tools for breeding. Our study aimed at identifying genetic components involved in early drought stress tolerance as a first step toward the development of improved pearl millet varieties or hybrids. A panel of 188 inbred lines from West Africa was phenotyped under early drought stress and well-irrigated conditions. We found a strong impact of drought stress on yield components. This impact was variable between inbred lines. We then performed an association analysis with a total of 392,493 SNPs identified using Genotyping-by-Sequencing (GBS). Correcting for genetic relatedness, genome wide association study identified QTLs for biomass production in early drought stress conditions and for stay-green trait. In particular, genes involved in the sirohaem and wax biosynthesis pathways were found to co-locate with association loci. Our results open the way to use genomic selection to breed pearl millet lines with improved yield under drought stress.
 
Publisher Public Library of Science
 
Date 2018-10
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/10916/1/journal.pone.0201635.pdf
Debieu, M and Sine, B and Passot, S and Grondin, A and Akata, E and Gangashetty, P I and Vadez, V and Gantet, P and Fonceka, D and Cournac, L and Hash, C T and Kane, N A and Vigouroux, Y and Laplaze, L (2018) Response to early drought stress and identification of QTLs controlling biomass production under drought in pearl millet. PLoS One (TSI). pp. 1-19. ISSN 2191-5547