Genetic structure of the date palm (Phoenix dactylifera) in the Old World reveals a strong differentiation between eastern and western populations

Salwa Zehdi-Azouzi, Emira Cherif, Souhila Moussouni, Muriel Gros-Balthazard, Summar Abbas Naqvi, Bertha Ludeña, Karina Castillo, Nathalie Chabrillange, Nadia Bouguedoura, Malika Bennaceur, Farida Si-Dehbi, Sabira Abdoulkader, Abdourahman Daher, Jean Frederic Terral, Sylvain Santoni, Marco Ballardini, Antonio Mercuri, Mohamed Ben Salah, Karim Kadri, Ahmed Othmani & 4 others Claudio Littardi, Amel Salhi-Hannachi, Jean Christophe Pintaud, Frédérique Aberlenc-Bertossi

    Research output: Contribution to journalArticle

    Abstract

    Background and Aims Date palms (Phoenix dactylifera, Arecaceae) are of great economic and ecological value to the oasis agriculture of arid and semi-arid areas. However, despite the availability of a large date palm germplasm spreading from the Atlantic shores to Southern Asia, improvement of the species is being hampered by a lack of information on global genetic diversity and population structure. In order to contribute to the varietal improvement of date palms and to provide new insights on the influence of geographic origins and human activity on the genetic structure of the date palm, this study analysed the diversity of the species. Methods Genetic diversity levels and population genetic structure were investigated through the genotyping of a collection of 295 date palm accessions ranging from Mauritania to Pakistan using a set of 18 simple sequence repeat (SSR) markers and a plastid minisatellite. Key Results Using a Bayesian clustering approach, the date palm genotypes can be structured into two different gene pools: the first, termed the Eastern pool, consists of accessions from Asia and Djibouti, whilst the second, termed the Western pool, consists of accessions from Africa. These results confirm the existence of two ancient gene pools that have contributed to the current date palm diversity. The presence of admixed genotypes is also noted, which points at gene flows between eastern and western origins, mostly from east to west, following a human-mediated diffusion of the species. Conclusions This study assesses the distribution and level of genetic diversity of accessible date palm resources, provides new insights on the geographic origins and genetic history of the cultivated component of this species, and confirms the existence of at least two domestication origins. Furthermore, the strong genetic structure clearly established here is a prerequisite for any breeding programme exploiting the effective polymorphism related to each gene pool.

    Original languageEnglish (US)
    Pages (from-to)101-112
    Number of pages12
    JournalAnnals of Botany
    Volume116
    Issue number1
    DOIs
    StatePublished - Jul 1 2015

    Fingerprint

    Phoenix dactylifera
    provenance
    genetic variation
    Djibouti
    Mauritania
    ecological value
    oases
    minisatellite repeats
    genotype
    Arecaceae
    domestication
    economic valuation
    genotyping
    Pakistan
    plastids
    anthropogenic activities
    population genetics
    gene flow
    germplasm
    population structure

    Keywords

    • Arecaceae
    • Date palm
    • genetic diversity
    • genetic structure
    • nuclear microsatellite
    • Phoenix dactylifera
    • plastid minisatellite
    • SSR markers

    ASJC Scopus subject areas

    • Plant Science

    Cite this

    Zehdi-Azouzi, S., Cherif, E., Moussouni, S., Gros-Balthazard, M., Naqvi, S. A., Ludeña, B., ... Aberlenc-Bertossi, F. (2015). Genetic structure of the date palm (Phoenix dactylifera) in the Old World reveals a strong differentiation between eastern and western populations. Annals of Botany, 116(1), 101-112. https://doi.org/10.1093/aob/mcv068

    Genetic structure of the date palm (Phoenix dactylifera) in the Old World reveals a strong differentiation between eastern and western populations. / Zehdi-Azouzi, Salwa; Cherif, Emira; Moussouni, Souhila; Gros-Balthazard, Muriel; Naqvi, Summar Abbas; Ludeña, Bertha; Castillo, Karina; Chabrillange, Nathalie; Bouguedoura, Nadia; Bennaceur, Malika; Si-Dehbi, Farida; Abdoulkader, Sabira; Daher, Abdourahman; Terral, Jean Frederic; Santoni, Sylvain; Ballardini, Marco; Mercuri, Antonio; Ben Salah, Mohamed; Kadri, Karim; Othmani, Ahmed; Littardi, Claudio; Salhi-Hannachi, Amel; Pintaud, Jean Christophe; Aberlenc-Bertossi, Frédérique.

    In: Annals of Botany, Vol. 116, No. 1, 01.07.2015, p. 101-112.

    Research output: Contribution to journalArticle

    Zehdi-Azouzi, S, Cherif, E, Moussouni, S, Gros-Balthazard, M, Naqvi, SA, Ludeña, B, Castillo, K, Chabrillange, N, Bouguedoura, N, Bennaceur, M, Si-Dehbi, F, Abdoulkader, S, Daher, A, Terral, JF, Santoni, S, Ballardini, M, Mercuri, A, Ben Salah, M, Kadri, K, Othmani, A, Littardi, C, Salhi-Hannachi, A, Pintaud, JC & Aberlenc-Bertossi, F 2015, 'Genetic structure of the date palm (Phoenix dactylifera) in the Old World reveals a strong differentiation between eastern and western populations', Annals of Botany, vol. 116, no. 1, pp. 101-112. https://doi.org/10.1093/aob/mcv068
    Zehdi-Azouzi, Salwa ; Cherif, Emira ; Moussouni, Souhila ; Gros-Balthazard, Muriel ; Naqvi, Summar Abbas ; Ludeña, Bertha ; Castillo, Karina ; Chabrillange, Nathalie ; Bouguedoura, Nadia ; Bennaceur, Malika ; Si-Dehbi, Farida ; Abdoulkader, Sabira ; Daher, Abdourahman ; Terral, Jean Frederic ; Santoni, Sylvain ; Ballardini, Marco ; Mercuri, Antonio ; Ben Salah, Mohamed ; Kadri, Karim ; Othmani, Ahmed ; Littardi, Claudio ; Salhi-Hannachi, Amel ; Pintaud, Jean Christophe ; Aberlenc-Bertossi, Frédérique. / Genetic structure of the date palm (Phoenix dactylifera) in the Old World reveals a strong differentiation between eastern and western populations. In: Annals of Botany. 2015 ; Vol. 116, No. 1. pp. 101-112.
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    abstract = "Background and Aims Date palms (Phoenix dactylifera, Arecaceae) are of great economic and ecological value to the oasis agriculture of arid and semi-arid areas. However, despite the availability of a large date palm germplasm spreading from the Atlantic shores to Southern Asia, improvement of the species is being hampered by a lack of information on global genetic diversity and population structure. In order to contribute to the varietal improvement of date palms and to provide new insights on the influence of geographic origins and human activity on the genetic structure of the date palm, this study analysed the diversity of the species. Methods Genetic diversity levels and population genetic structure were investigated through the genotyping of a collection of 295 date palm accessions ranging from Mauritania to Pakistan using a set of 18 simple sequence repeat (SSR) markers and a plastid minisatellite. Key Results Using a Bayesian clustering approach, the date palm genotypes can be structured into two different gene pools: the first, termed the Eastern pool, consists of accessions from Asia and Djibouti, whilst the second, termed the Western pool, consists of accessions from Africa. These results confirm the existence of two ancient gene pools that have contributed to the current date palm diversity. The presence of admixed genotypes is also noted, which points at gene flows between eastern and western origins, mostly from east to west, following a human-mediated diffusion of the species. Conclusions This study assesses the distribution and level of genetic diversity of accessible date palm resources, provides new insights on the geographic origins and genetic history of the cultivated component of this species, and confirms the existence of at least two domestication origins. Furthermore, the strong genetic structure clearly established here is a prerequisite for any breeding programme exploiting the effective polymorphism related to each gene pool.",
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    AU - Zehdi-Azouzi, Salwa

    AU - Cherif, Emira

    AU - Moussouni, Souhila

    AU - Gros-Balthazard, Muriel

    AU - Naqvi, Summar Abbas

    AU - Ludeña, Bertha

    AU - Castillo, Karina

    AU - Chabrillange, Nathalie

    AU - Bouguedoura, Nadia

    AU - Bennaceur, Malika

    AU - Si-Dehbi, Farida

    AU - Abdoulkader, Sabira

    AU - Daher, Abdourahman

    AU - Terral, Jean Frederic

    AU - Santoni, Sylvain

    AU - Ballardini, Marco

    AU - Mercuri, Antonio

    AU - Ben Salah, Mohamed

    AU - Kadri, Karim

    AU - Othmani, Ahmed

    AU - Littardi, Claudio

    AU - Salhi-Hannachi, Amel

    AU - Pintaud, Jean Christophe

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    N2 - Background and Aims Date palms (Phoenix dactylifera, Arecaceae) are of great economic and ecological value to the oasis agriculture of arid and semi-arid areas. However, despite the availability of a large date palm germplasm spreading from the Atlantic shores to Southern Asia, improvement of the species is being hampered by a lack of information on global genetic diversity and population structure. In order to contribute to the varietal improvement of date palms and to provide new insights on the influence of geographic origins and human activity on the genetic structure of the date palm, this study analysed the diversity of the species. Methods Genetic diversity levels and population genetic structure were investigated through the genotyping of a collection of 295 date palm accessions ranging from Mauritania to Pakistan using a set of 18 simple sequence repeat (SSR) markers and a plastid minisatellite. Key Results Using a Bayesian clustering approach, the date palm genotypes can be structured into two different gene pools: the first, termed the Eastern pool, consists of accessions from Asia and Djibouti, whilst the second, termed the Western pool, consists of accessions from Africa. These results confirm the existence of two ancient gene pools that have contributed to the current date palm diversity. The presence of admixed genotypes is also noted, which points at gene flows between eastern and western origins, mostly from east to west, following a human-mediated diffusion of the species. Conclusions This study assesses the distribution and level of genetic diversity of accessible date palm resources, provides new insights on the geographic origins and genetic history of the cultivated component of this species, and confirms the existence of at least two domestication origins. Furthermore, the strong genetic structure clearly established here is a prerequisite for any breeding programme exploiting the effective polymorphism related to each gene pool.

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    KW - plastid minisatellite

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