Assessment of genetic diversity among different sugarcane genotypes using internal transcribed spacer (ITS) region of the ribosomal DNA (rDNA)

Farsangi Forough Jomhe; Avinash Shivaji Thorat; Rachayya Mallikarjun Devarumath

doi:10.30574/gscbps.2018.5.2.0108

Authors

Farsangi Forough Jomhe Molecular Biology and Genetic Engineering Section, Vasantdada Sugar Institute, Manjari (Bk), Pune, India-412307.
Avinash Shivaji Thorat Department of Biotechnology, Savitribai Phule, Pune University, Pune, India-411007.
Rachayya Mallikarjun Devarumath Department of Biotechnology, Savitribai Phule, Pune University, Pune, India-411007.

DOI:

https://doi.org/10.30574/gscbps.2018.5.2.0108

Keywords:

Genetic diversity, ITS, rDNA, PCR, Sugarcane

Abstract

Internal transcribed spacer or ITS region of nuclear ribosomal DNA (rDNA) has been used to evaluate genetic assortment and phylogenetic relationship in nine sugarcane genotypes including Saccharum species and another related genus as Erianthus, Narenga and hybrid. DNA was extracted from selected genotypes and ITS (ITS-1 and ITS-2) regions were amplified using specific primers. The sequence lengths ITS-1 showed 205- 207 bp, while ITS2 was ranged from 211- 218 bp. However, G+C content (%) 65.2% - 67% in ITS-1 and in ITS-2 68.4% - 99.7%. The sequence lengths of fragment and GC content of ITS-1 and ITS-2 regions showed variable. To evaluate the phylogenetic association of both the region of ITS (ITS-1 and ITS-2) neighbor-joining (NJ) method was employed. The cluster A of ITS-1 and cluster B for ITS-2 and cluster C combined between ITS1+ ITS2 sequences gave two distinct groups A and B. The group A represented the ITS1 sequences which showed two subgroups I and II. The A-I subgroup consisted of wild species of sugarcane; Erianthus, Narenga and S. robustum, whereas the A-II subgroup consisted of the Saccharum species and hybrid. The ITS2 sequences in the group B showed better correlation amongst each other. The sequences ITS-1 & ITS-2 combined and compared with some selected sequences from NCBI database using NJ method. The results have confirmed that ITS region can be used for evaluating the genetic assortment in Saccharum and its closely related genes.

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