Genetic diversity and population structure of common walnut (Juglans regia) in China based on EST-SSRs and the nuclear gene phenylalanine ammonia-lyase (PAL)

Han, Hua; Woeste, Keith; Hu, Yiheng; Dang, Meng; Tian, Zhendong; Gao, Xiaoxiao; Zhou, Huijuan; Feng, Xiaojia; Zhao, Guifang; Zhao, Peng

doi:10.1007/s11295-016-1064-1

Cited by 33 publications

(43 citation statements)

References 58 publications

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“…The following sections depict an overview of these molecular studies and their application (Table 2). Woeste et al 2002;Dangl et al 2005;Hoban et al 2008;Zhang et al 2010;Qi et al 2011;Yi et al 2011;Wu et al 2012;Zhang et al 2013;Chen et al 2013;Najafi et al 2014;Topçu et al 2015;Ikhsan et al 2016;Dang et al 2015;Hu et al 2015;Dang et al 2016 Interspecific hybrids identification Pollegioni et al 2008Pollegioni et al , 2009 Genetic diversity/relationships determination Foroni et al 2005;Dangl et al 2005;Victory et al 2006;Robichaud et al 2006;Wang et al 2008;Aradhya et al 2009;Gunn et al 2010;Karimi et al 2010;Bai et al 2010;Mohsenipoor et al 2010;Ebrahimi et al 2011;Ruiz-Garcia et al 2011;Pollegioni et al 2011;Qi et al 2011;Grauke et al 2012;Mahmoodi et al 2013;Zhang et al 2013;Pop et al 2013;Najafi et al 2014;Dang et al 2015;Hu et al 2015;Han et al 2016;Noor Shah et al 2016;Ćelepirović et al 2016;Wang et al 2016;…”

Section: Historical Overview Of Molecular Marker Development and Usementioning

confidence: 99%

“…Cultivars, mainly from Spain and the USA, were studied with SSR markers and data separated Spanish cultivars from those of California (RuizGarcia et al 2011). Additional studies using SSRs have focused on germplasm diversity and genetic relationships among Indian genotypes (Noor Shah et al 2016), among trees from coldtemperate areas of the USA and Europe (Ebrahimi et al 2017), and among germplasm in China (Han et al 2016;Wang et al 2016) and Romania (Pop et al 2013). Finally, two recent papers have been published.…”

Section: Peak Of Molecular Studies With Ssrs From the Late 2000smentioning

confidence: 99%

“…In 2016, the genetic diversity of Chinese germplasm was assessed using the sequence polymorphisms within the phenylalanine ammonia-lyase (PAL) gene (Han et al 2016). This gene was previously characterized and designated as JrPAL (Xu et al 2012a).…”

Section: Progress On Transcriptomicsmentioning

confidence: 99%

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Walnut: past and future of genetic improvement

Bernard

Lheureux²,

Dirlewanger

2017

Tree Genetics & Genomes

163

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Persian or English walnut (Juglans regia L.), the walnut species cultivated for nut production, is one of the oldest food sources known. Persian walnuts, native to the mountain valleys of Central Asia, are grown worldwide in temperate areas. World production exceeds three million tons since 2012, mostly provided by China, the USA, and Iran. Despite very ancient culture of walnut species (Juglans spp.), breeding actually started in the twentieth century. Using a range of methodologies, from morphological markers to the most recent advances in genome analysis, many genetic studies of walnut have been conducted during the past 30 years, including examination of diversity, determination of relationships within or among germplasm collections and populations, phylogenetic and origin elucidation, genetic map construction, and biotic or abiotic stress investigations. The genetic improvement of walnut has undergone great evolution. The producing countries of the Middle East have widely studied morphological characteristics of walnut. The USA and France, for example, are behind important cultivar releases such as BChandler^and BFranquette.^Finally, genomics represents a major breakthrough in walnut improvement, in particular by recent sequencing of both chloroplast and nuclear genomes. This review summarizes worldwide molecular and Bomics^studies and gives an overview of the main walnut breeding programs.

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Section: Historical Overview Of Molecular Marker Development and Usementioning

confidence: 99%

Section: Peak Of Molecular Studies With Ssrs From the Late 2000smentioning

confidence: 99%

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Walnut: past and future of genetic improvement

Bernard

Lheureux²,

Dirlewanger

2017

Tree Genetics & Genomes

163

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“…Taken together, these results reveal novel information on population genetics and provide specific geographical regions containing high genetic diversity of the Juglans species sampled, which will assist in future conservation management.Forests 2018, 9, 646 2 of 22 karyotype of 2n = 2x = 32 [3]. All Juglans are monoecious, wind-pollinated, and temperate deciduous trees [1,4,5].China is the third largest in-shell walnut producer, with a production of 1,700,000 tons annually [6,7]. The iron walnut (J. sigillata Dode) is a thick-shelled, edible walnut that grows in southwestern China and is closely related to the widely cultivated J. regia [8][9][10][11].…”

mentioning

confidence: 99%

“…Such distributions should enable the detection and extent of gene introgression between the two species and within different populations.Whether J. regia and J. sigillata are legitimately distinct taxa in China has been controversial, but what is clear is that they freely hybridize and represent closely related gene pools. There is evidence of introgression between the two species in regions of sympatry, barring incomplete lineage sorting [4]. Previous studies of J. regia and J. sigillata mostly involved morphology, quality selection, and detecting the genetic structure of populations in different geographic regions [9,11].…”

mentioning

confidence: 99%

Population Structure, Genetic Diversity, and Gene Introgression of Two Closely Related Walnuts (Juglans regia and J. sigillata) in Southwestern China Revealed by EST-SSR Markers

Sun

Bai

et al. 2018

Forests

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The common walnut (Juglans regia L.) and iron walnut (J. sigillata Dode) are well-known economically important species cultivated for their edible nuts, high-quality wood, and medicinal properties and display a sympatric distribution in southwestern China. However, detailed research on the genetic diversity and introgression of these two closely related walnut species, especially in southwestern China, are lacking. In this study, we analyzed a total of 506 individuals from 28 populations of J. regia and J. sigillata using 25 EST-SSR markers to determine if their gene introgression was related to sympatric distribution. In addition, we compared the genetic diversity estimates between them. Our results indicated that all J. regia populations possess slightly higher genetic diversity than J. sigillata populations. The Geostatistical IDW technique (HO, PPL, NA and PrA) revealed that northern Yunnan and Guizhou provinces had high genetic diversity for J. regia while the northwestern Yunnan province had high genetic diversity for J. sigillata. AMOVA analysis revealed that significant genetic variation was mainly distributed within population as 73% in J. regia and 76% in J. sigillata. The genetic differentiation (FST) was 0.307 between the two walnut species (p < 0.0001), which was higher than FST values within populations (J. regia FST = 0.265 and J. sigillata FST = 0.236). However, the STRUCTURE analysis of the J. regia and J. sigillata populations revealed two genetic clusters in which gene introgression exists, therefore, the boundary of separation between these two walnut species is not clear. Moreover, these results were validated by NJ and UPGMA analysis with additional conformation from the PCoA. Based on the SSR data, our results indicate that J. sigillata is an ecotype of J. regia. Taken together, these results reveal novel information on population genetics and provide specific geographical regions containing high genetic diversity of the Juglans species sampled, which will assist in future conservation management.

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Advances in Plant Breeding Strategies: Nut and Beverage Crops

2019

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Genetic diversity and population structure of common walnut (Juglans regia) in China based on EST-SSRs and the nuclear gene phenylalanine ammonia-lyase (PAL)

Cited by 33 publications

References 58 publications

Walnut: past and future of genetic improvement

Walnut: past and future of genetic improvement

Population Structure, Genetic Diversity, and Gene Introgression of Two Closely Related Walnuts (Juglans regia and J. sigillata) in Southwestern China Revealed by EST-SSR Markers

Advances in Plant Breeding Strategies: Nut and Beverage Crops

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