Phylogeny and evolutionary histories of Pyrus L. revealed by phylogenetic trees and networks based on data from multiple DNA sequences

Zheng, Xiaoyan; Cai, Danying; Potter, Daniel; Postman, Joseph D.; Liu, Jing; Teng, Yuanwen

doi:10.1016/j.ympev.2014.07.009

Cited by 62 publications

(77 citation statements)

References 46 publications

(12 reference statements)

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“…The hypervariable accD-psaI intergenic spacer was amplified by PCR using accD F2 (Zheng et al, 2014) and psaI 75R (Small et al, 1998) primers. PCR reactions contained: 1X Phusion HF Buffer, 200 μM dNTPs each, 0.5 μM each primer, 0.2 U Phusion Taq DNA polymerase (Thermo Fischer Scientific), 30 ng genomic DNA and H 2 O to a final volume of 50 μl.…”

Section: Methodsmentioning

confidence: 99%

“…Several studies based on molecular markers have estimated the diversity in Pyrus , including modern cultivars and germplasm accessions. RFLPs (Iketani et al, 1998), RAPDs (Oliveira et al, 1999; Teng et al, 2001, 2002), AFLPs (Monte-Corvo et al, 2000; Dolatowski et al, 2004; Bao et al, 2008) and SSRs (Kimura et al, 2002; Bao et al, 2007; Wünsch and Hormaza, 2007; Miranda et al, 2010; Gasi et al, 2013; Akçay et al, 2014; Zheng et al, 2014; Urrestarazu et al, 2015) have been widely used to estimate the genetic diversity and the relationships between pear cultivars, wild forms, and related species. Some ancient Italian pear accessions have also been characterized using morphological and SSR markers (Martinelli et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Characterization and Phylogenetic Analysis of Ancient Italian Landraces of Pear

et al. 2017

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Pear is one of the oldest fruit tree crops and the third most important temperate fruit species. Its domestication took place independently in the Far East (China) and in the Caucasus region. While the origin of Eastern Asian cultivars is clear, that of European cultivars is still in doubt. Italy has a wealth of local varieties and genetic resources safeguarded by several public and private collections to face the erosion caused by the introduction of improved varieties in specialized orchards. The objectives of the present study were: (i) to characterize the existing germplasm through nuclear (SSR) and (ii) to clarify the genetic divergence between local and cultivated populations through chloroplast DNA (cpDNA) markers in order to provide insights into phylogenetic relationships of Pyrus spp. For this reason, 95 entries from five different germplasm collections, including nine European, Mediterranean and Eastern Asian species, were analyzed, and the intergenic accD-psaI sequences were compared to the worldwide distributed dataset encompassing a total of 298 sequences from 26 different Pyrus species. The nine nuclear SSRs were able to identify a total of 179 alleles, with a loci polymorphism P = 0.89. Most of the variation (97%) was found within groups. Five accessions from different sources were confirmed to be the same. Eight out of 20 accessions of unknown origin were identified, and six synonyms were detected. Locus NH030a was found to be monomorphic in all the cultivated accessions and in reference species interfertile with P. communis, leading to hypothesize selection pressures for adaptation to cultivation. The cpDNA sequences of the 95 accessions were represented by 14 haplotypes, six of which (derived from P. communis, P. cossonii and P. ussuriensis) are recorded here for the first time and may suggest the ancient origin of some local varieties. The network analysis of the 298 cpDNA sequences allowed two different haplogroups, Eastern and Western Eurasia, to be defined, supporting recent views of a clear division between Occidental and Oriental species. By combining the results from nuclear and uniparental markers, it was possible to better define many unknown accessions.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization and Phylogenetic Analysis of Ancient Italian Landraces of Pear

et al. 2017

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“…Others (e.g., Grevtzova, 1978) have similarly associated the production of unreduced female gametophytes with hybridization. Recent phylogenetic analyses of Pyrus (Zheng & al., 2014;Korotkova & al., 2017;Wu & al., 2018) refer to variation in ploidy level, and especially hybridization, as underlying the complexity of species-level taxonomy in this genus. Zheng & al.…”

Section: Version Of Recordmentioning

confidence: 99%

Sex and Rosaceae apomicts

Dickinson

2018

TAXON

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This paper updates earlier reviews of polyploidy and reproductive biology in the Rosaceae, and does so with a focus on hybridization in relation to polyploidy and (facultative) gametophytic apomixis. Taking data mainly from tribe Maleae, it also seeks to point out evidence for a potential role for fertilization of infrequent unreduced gametes in diploid-diploid crosses in producing autopolyploids. Apomixis may originate in these autopolyploids, and spread as they cross with diploids and other polyploids.

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“…Among them, P. pyraster is occasionally regarded by some authors [Rehder 1949;Kurtto 2009] at a variety or subspecies rank under P. communis. However, recently a molecular study demonstrated that P. communis is more closely related to P. caucasica and P. nivalis, rather than to P. pyraster [Zheng et al, 2014]. It is also distinctly different from P. communis in having dentate margins of leaves (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Occidental taxa are distributed in Europe, North Africa, Turkey, Iran, Central Asia and Afghanistan, while oriental pears are widespread in East Asia. Pyrus pashia is accepted as a link between Occidental and Oriental pear species [Rubtsov, 1944;Zheng et al, 2014] because it is native to China, Bhutan, India, Kashmir, Laos, Myanmar, Nepal, the western part of Pakistan, Thailand, Vietnam, Afghanistan [Gu & Spongberg, 2003], and have been also recently recorded from northeastern Iran [Zamani et al, 2009]. It is placed in Pyrus sect.…”

Section: Introductionmentioning

confidence: 99%

Taxonomic and biogeographic notes on the genus Pyrus L. (Rosaceae): a new record and a new synonym, with data on seed morphology

Dönmez¹

2019

plantfungalres

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Species of the genus Pyrus distributed in Europe include P. communis L., P. pyraster, P. nivalis Jacq., and P. cordata Desv. subsp. cordata. Pyrus pyraster is occasionally regarded as a variety or subspecies of P. communis. However, a molecular study has recently demonstrated that P. communis is more closely related to P. caucasica and P. nivalis, rather than to P. pyraster. In this study, Pyrus pyraster is reported from Turkey for the first time. Pyrus vallis-demonis, a species recently described from Italy, is here reduced to a synonym of Pyrus pashia based on morphology. Also, we discuss seed ornamentation of Pyrus pashia and a closely related taxon, P. cordata subsp. boissieriana, to achieve a better understanding of taxonomy in the group.

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Phylogeny and evolutionary histories of Pyrus L. revealed by phylogenetic trees and networks based on data from multiple DNA sequences

Cited by 62 publications

References 46 publications

Characterization and Phylogenetic Analysis of Ancient Italian Landraces of Pear

Characterization and Phylogenetic Analysis of Ancient Italian Landraces of Pear

Sex and Rosaceae apomicts

Taxonomic and biogeographic notes on the genus Pyrus L. (Rosaceae): a new record and a new synonym, with data on seed morphology

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