Abstract
Casuarina is a widely cultivated plantation tree species in coastal India, primarily due to its fast growth, high productivity and suitable for pulp and paper production. However, genetic studies of Casuarina have been hindered by lack of genomic resources and genetic markers. Knowledge of the genetic diversity and population structure of Casuarina germplasms will provide the basis for utilizing and improving resource in the breeding program. Keeping this in view, in the present study, we have identified a total of 11,503 simple sequence repeat (SSR) makers from 86,415 expressed sequence tags (ESTs) of Casuarina equisetifolia and C. junghuhniana after redundancy elimination. Dinucleotide repeats were the most abundant accounting for 72.5 % of all microsatellites, followed by trimer (23.4 %), hexamer (1.7 %), tetramer (1.5 %), and very few pentamer (0.6 %) repeats. Of these, 50 markers were used to estimate genetic diversity and population structure among 96 accessions of C. cunninghamiana and C. junghuhniana. EST-SSR markers revealed high level of polymorphism, detecting a total of 829 alleles with an average of 17 alleles per locus. Polymorphic information content (PIC) values ranged from 0.32 to 0.93, with an average of 0.78 per locus. The average observed (H o ) and expected heterozygosity (H e ) obtained was high and fairly similar in C. cunninghamiana and C. junghuhniana, thereby suggesting highly heterogeneous nature of Casuarina. Population structure using a Bayesian model-based clustering approach identified clear delineation between C. cunninghamiana and C junghuhniana. Further, these markers were also evaluated in four species of Casuarina confirming high rate of cross-species transferability. The results of this study can provide valuable insights for genetic and genomic research in Casuarina.
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Acknowledgments
The author thanks Dr. Mohan Varghese for his guidance and Dr. Ramasamy Annadurai for his valuable comments on the manuscript and Dr. Kamalakannan Rathinam for facilitating assembly of plant materials. The research work was supported by Life Science and Technology Centre, ITC Ltd, Bangalore, India, under the framework of developing adaptable Casuarina in in-land conditions.
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EST sequences used in this study were deposited into NCBI (Accession number: PRJNA294034).
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Communicated by G. G. Vendramin
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Kullan, A.R.K., Kulkarni, A.V., Kumar, R.S. et al. Development of microsatellite markers and their use in genetic diversity and population structure analysis in Casuarina . Tree Genetics & Genomes 12, 49 (2016). https://doi.org/10.1007/s11295-016-1009-8
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DOI: https://doi.org/10.1007/s11295-016-1009-8