Evaluation of Genetic Diversity in Collection from Iranian Jujube Ecotypes (Ziziphus spp.) using ISSR-molecular Marker

علوم باغبانی

Article 5, Volume 31, Issue 3, September 2017, Pages 425-437   

Document Type: Research Article

DOI: 10.22067/jhorts4.v31i3.27523

Authors

Hajar Shayesteh^{* 1}; Saeid Malekzadeh Shafaroudi¹; Kamal Ghous²; Farajollah Shahriari³

¹Ferdowsi University of Mashhad

²Jahad-e-Keshavarzi Institute of Southern Khorasan

³Ferdowsi university of Mashhad

Abstract

Introduction Jujube (Zizyphus jujuba Mill.) as a valuable medicinal plant and adapted to different climatic conditions is widespread in many parts of Iran. Nowadays, beside the export of its fruit, jujube is also used as an herbal medicine to treat the diseases, so it has a high economic value. Study on genetic diversity is the first step to identify and preservation of germplasm. It is also considered as the basic principles of plant breeding. DNA markers seem to be the best way in determination of the genetic diversity. Inter simple sequence repeats (ISSR) markers are highly polymorphic and combine most benefits of Simple Sequence Repeats (SSRs) and amplified fragment length polymorphism (AFLP) to the generality of random amplified polymorphic DNA (RAPD).
Materials and Methods In order to study of the genetic diversity among 31 ecotypes collected from eight Jujube-rich provinces, including South Khorasan, Razavi Khorasan, Mazandaran, Golestan, Qom, Isfahan, Lorestan and Fars. Genomic DNA was extracted by CTAB method and polymerase chain reaction (PCR) was performed with 13 ISSR primers in which six most efficient primers were selected. Cluster analysis based on Dice similarity coefficient and Unweighed Pair Group Method with Arithmetic Mean (UPGMA) was carried out and POPGENe.3.2 software was used to determine the similarity of populations with each other.
Results and Discussion 84 loci were amplified and 70 of them (83%) revealed a proper polymorphism with the size between 200 and 2000 base pair. The average number of amplified and polymorphic bands per primer was 14 and 11.6 respectively. Primers with di-nucleotide repeats produced more polymorphic bands than ones with tri-nucleotide repeats. It seems that this is due to a higher frequency of sequences containing di-nucleotide repeats in intergenic regions and higher possibility of mutation revealed in more diversity in comparison to gene coding regions. Anchored primers with 1 or 2 nucleotides at the 5’ end make sure annealing only to the ends of SSRs in template DNA, so avoiding internal priming and smear formation. In addition, the anchor lets only a subset of the microsatellites to serve as priming sites. Primers (AC)8YT and (GA)8A with the higher percentage of polymorphism is recommended for further analysis. According to the cluster analysis, the ecotypes could be classified into seven main groups at the 0.85 level of genetic similarity. The most genetic similarity (0.95) was observed between ecotypes from Kalaleh and Doroh and also Noghab and Dustiran and the least genetic similarity (0.48) observed between Kangan and Borzaderan. POPGENe.3.2 software data indicated that populations of Isfahan and South Khorasan had the slightest difference while populations of Isfahan and Razavi Khorasan showed the most difference.
Conclusions In general results demonstrated that the total diversity of jujube ecotypes in Iran is summarized in the area of South Khorasan province. Given data showed that South Khorasan has been an original place of cultivation of this medicinal plant, this area could be considered as one of the important centers of jujube diversity. In addition, significant levels of diversity were observed among ecotypes belonging to Isfahan and Mazandaran provinces.

Keywords

Genetic diversity; ISSR marker; Zizyphus jujuba

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