Genetic identity and relationships of Iranian apple (Malus?×?domestica Borkh.) cultivars and landraces, wild Malus species and representative old apple cultivars based on simple sequence repeat (SSR) marker analysis |
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| Authors: | Ali Gharghani Zabihollah Zamani Alireza Talaie Nnadozie C Oraguzie Reza Fatahi Hassan Hajnajari Claudia Wiedow and Susan E Gardiner |
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| Institution: | (1) Department of Horticultural Science, University of Tehran, 31587-11167 Karaj, Iran;(2) Department of Horticultural Sciences, Faculty of Agriculture, University of Shiraz, PO Box 7144165186, Shiraz, Iran;(3) Department of Horticulture &; Landscape Architecture, IAREC, Washington State University, 24106N Bunn Road, Prosser, WA 99350, USA;(4) Horticulture Department, Seed and Plant Improvement Institute (SPII), 31585-4119 Karaj, Iran;(5) The Horticulture and Food Research Institute of New Zealand Ltd (HortResearch), Private Bag 11030, Palmerston North, 4442, New Zealand |
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| Abstract: | In order to shed light on the role of Iran in apple evolution and domestication, we chose to investigate the relationships
of a collection of 159 accessions of wild and domesticated apples including Iranian indigenous apple cultivars and landraces,
selected wild species, and old apple scion and rootstock cultivars from different parts of the world. The majority of the
wild species belonged to M. sieversii, which is widely believed to be the main maternal wild ancestor of domestic apples, from Kazakhstan and M. orientalis, which is one of the probable minor ancestors of domestic apples, from Turkey and Russia located on the east and west of
Iran, respectively. The accessions were assigned into six arbitrary populations for the purpose of generating information
on genetic parameters. Nine simple sequence repeat (SSR) loci selected from previous studies in apple were screened over DNA
extracted from all the accessions. Results showed that all SSR loci displayed a very high degree of polymorphism with 11–25
alleles per locus. In total, there were 153 alleles across all loci with an average of 17 alleles per locus. The SSR allelic
data were then used for estimation of population genetic parameters, including genetic variation statistics, F-statistics,
gene flow, genetic identity, genetic distance and then cluster analysis using POPGENE 1.32 software. The F-statistics and
gene flow in particular, showed that there was more intra-population than between population variation. The genetic identity
and genetic distance estimates, and the dendrogram generated from the un-weighted pair group arithmetic average (UPGMA) method
of cluster analysis showed that the Iranian cultivars and landraces were more closely related to M. sieversii from Central Asia (east of Iran) and M. orientalis native to Turkey and Russia than to other accessions of Malus species. Also, the old apple cultivars from different parts of the world have a closer genetic relationship to M. sieversii, M. orientalis and the Iranian apples, than to other wild species. Based on these results, we suggest that the Iranian apples may occupy
an intermediate position between the domesticated varieties and wild species. We propose that Iran could be one of the major
players in apples’ domestication and transfer from Central Asia to the western countries. |
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| Keywords: | Apple rootstock cultivars Apple scion cultivars Genetic diversity Genetic relationship Iranian apples Malus spp M orientalis M sieversii Microsatellite |
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