• R YASODHA

      Articles written in Journal of Biosciences

    • Chloroplast genome analysis of Angiosperms and phylogenetic relationships among Lamiaceae members with particular reference to teak (Tectona grandis L.f)

      P MAHESWARI C KUNHIKANNAN R YASODHA

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      Availability of comprehensive phylogenetic tree for flowering plants which includes many of the economicallyimportant crops and trees is one of the essential requirements of plant biologists for diverse applications. It isthe first study on the use of chloroplast genome of 3265 Angiosperm taxa to identify evolutionary relationshipsamong the plant species. Sixty genes from chloroplast genome was concatenated and utilized to generate thephylogenetic tree. Overall the phylogeny was in correspondence with Angiosperm Phylogeny Group (APG) IVclassification with very few taxa occupying incongruous position either due to ambiguous taxonomy orincorrect identification. Simple sequence repeats (SSRs) were identified from almost all the taxa indicating thepossibility of their use in various genetic analyses. Large proportion (95.6%) of A/T mononucleotide wasrecorded while the di, tri, tetra, penta and hexanucleotide amounted to less than 5%. Ambiguity of thetaxonomic status of Tectona grandis L.f was assessed by comparing the chloroplast genome with closelyrelated Lamiaceae members through nucleotide diversity and contraction/expansion of inverted repeat regions.Although the gene content was highly conserved, structural changes in the genome was evident. Phylogeneticanalysis suggested that Tectona could qualify for a subfamily Tectonoideae. Nucleotide diversity in intergenicand genic sequences revealed prominent hyper-variable regions such as, rps16-trnQ, atpH-atpI, psc4-psbJ,ndhF, rpl32 and ycf1 which have high potential in DNA barcoding applications.

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