Genetic structure of the date palm (<i>Phoenix dactylifera</i>) 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‐Frédéric; Santoni, Sylvain; Ballardini, Marco; Mercuri, A.; Salah, Mohamed Ben; Kadri, K; Othmani, Ahmed; Littardi, Claudio; Salhi-Hannachi, Amel; Pintaud, Jean Christophe; Aberlenc-Bertossi, Frédérique

doi:10.1093/aob/mcv068

Cited by 82 publications

(54 citation statements)

References 53 publications

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“…In light of recent findings of a strong population division between eastern and western date palm cultivars (Chaluvadi et al 2014;Mathew et al 2015;Zehdi-Azouzi et al 2015;Flowers et al 2019) it is important to consider which geographical regions this allele is found in. All dates with high sucrose shared the same allele that contained the same structure of deletion and this suggests that this Date palm invertase deletion Page nr.…”

Section: Discussionmentioning

confidence: 99%

Deletion of beta-fructofuranosidase (invertase) genes is associated with sucrose content in Date Palm fruit

Malek

Mathew

et al. 2019

Preprint

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The fruit of date palm trees are an important part of the diet for a large portion of the Middle East and North Africa. The fruit is consumed both fresh and dry and can be stored dry for extended periods of time. Date fruits vary significantly across hundreds of cultivars identified in the main regions of cultivation. Most dried date fruit are low in sucrose but high in glucose and fructose. However, high sucrose content is a distinctive feature of some date fruit and affects flavor as well as texture and water retention. To identify the genes controlling high sucrose content we analyzed date fruit metabolomics for association with genotype data from 121 date fruits. We found significant association of dried date sucrose content and a genomic region that contains 3 tandem copies of the betafructofuranosidase (invertase) gene in the reference Khalas genome, a low sucrose fruit. High sucrose cultivars including the popular Deglet Noor had a homozygous deletion of two of the 3 copies of the invertase gene. We show the deletion allele is derived when compared to the ancestral allele that retains the all copies of the gene in 3 other species of Phoenix. The fact that 2 of the 3 tandem invertase copies are associated with dry fruit sucrose content will assist in better understanding the distinct roles of multiple date palm invertases in plant physiology. Identification of the recessive alleles associated with end-point sucrose content in date fruit may be used in selective breeding in the future. Date palm, sucrose, invertaseDate palm invertase deletion

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Section: Discussionmentioning

confidence: 99%

Deletion of beta-fructofuranosidase (invertase) genes is associated with sucrose content in Date Palm fruit

Malek

Mathew

et al. 2019

Preprint

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show abstract

“…While we observed it to be more common in North African cultivars, this could simply be a result of multiple cultivars being derived from Deglet Noor. At the same time, despite genomic analysis clearly placing Deglet Noor in the western subpopulation, it has been noted to contain chloroplast DNA from the Eastern subpopulation suggesting Eastern maternal introgression at some point (Zehdi-Azouzi et al, 2015). That it is a derived allele and not ancestral is supported by the fact that we observed related Phoenix species to contain all 3 tandem copies of the invertase genes rather than the deletion.…”

Section: Discussionmentioning

confidence: 56%

“…In light of recent findings of a strong population division between eastern and western date palm cultivars (Chaluvadi, Khanam, Aly, & Bennetzen, 2014;Flowers et al, 2019;Mathew et al, 2015;Zehdi-Azouzi, Cherif, & Moussouni, 2015), it is important to consider which geographical regions this allele is found in. All dates with high sucrose shared the same allele that contained the same structure of West subpopulations.…”

Section: Discussionmentioning

confidence: 99%

Deletion of beta‐fructofuranosidase (invertase) genes is associated with sucrose content in Date Palm fruit

Malek

Mathew

et al. 2020

Plant Direct

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The fruit of date palm trees are an important part of the diet for a large portion of the Middle East and North Africa. The fruit is consumed both fresh and dry and can be stored dry for extended periods of time. Date fruits vary significantly across hundreds of cultivars identified in the main regions of cultivation. Most dried date fruit are low in sucrose but high in glucose and fructose. However, high sucrose content is a distinctive feature of some date fruit and affects flavor as well as texture and water retention. To identify the genes controlling high sucrose content, we analyzed date fruit metabolomics for association with genotype data from 120 date fruits. We found significant association of dried date sucrose content and a genomic region that contains 3 tandem copies of the beta‐fructofuranosidase (invertase) gene in the reference Khalas genome, a low‐sucrose fruit. High‐sucrose cultivars including the popular Deglet Noor had a homozygous deletion of two of the 3 copies of the invertase gene. We show the deletion allele is derived when compared to the ancestral allele that retains all copies of the gene in 3 other species of Phoenix. The fact that 2 of the 3 tandem invertase copies are associated with dry fruit sucrose content will assist in better understanding the distinct roles of multiple date palm invertases in plant physiology. Identification of the recessive alleles associated with end‐point sucrose content in date fruit may be used in selective breeding in the future.

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“…Geographic isolation may affect genetic differentiation of some species in certain extent (Bacilieri et al 2013;Zehdi-Azouzi et al 2015). Among the eight natural populations of M. laosensis, the genetic distance between GXFC and GXSS population was the smallest (0.3334), while the genetic distance between GXRX and YNML was the largest (0.7126).…”

Section: Cluster Analysismentioning

confidence: 99%

Genetic diversity and structure among natural populations of Mytilaria laosensis (Hamamelidaceae) revealed by microsatellite markers

Yuan²,

Guo

et al. 2018

Silvae Genetica

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Mytilaria laosensis is a fast-growing tropical broadleaf tree that is extensively used for wood production and has significant ecological benefits. To investigate the genetic diversity and population structure of M. laosensis, eight major natural populations in China were analyzed by using simple sequence repeat (SSR) markers. A total of 88 microsatellite-containing fragments were obtained by the method of magnetic bead enrichment, among which 26 pairs of SSR primers were screened out and used to generate a total of 190 alleles among 152 individuals. The average of observed number of alleles, Shannon’s information index and polymorphism information content per locus were 18.3, 1.1577 and 0.7759, respectively, implying a high level of genetic diversity in M. laosensis populations. The variation within populations accounted for 81.74 % of total variation based on analysis of molecular variance. Cluster analysis divided the eight populations into four groups, among which five populations from the southern parts of Guangxi province were classified as one major group. Mantel test showed that there was highly significant correlation between Euclidean genetic distance and geographic distance, suggesting that geographic isolation contribute to the high genetic diversity of M. laosensis. Together, these could provide support for the feasibility of exploration and utilization of M. laosensis in subtropical areas of East Asia including Jiangxi, Hunan and Fujian province of China.

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

Cited by 82 publications

References 53 publications

Deletion of beta-fructofuranosidase (invertase) genes is associated with sucrose content in Date Palm fruit

Deletion of beta-fructofuranosidase (invertase) genes is associated with sucrose content in Date Palm fruit

Deletion of beta‐fructofuranosidase (invertase) genes is associated with sucrose content in Date Palm fruit

Genetic diversity and structure among natural populations of Mytilaria laosensis (Hamamelidaceae) revealed by microsatellite markers

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