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Association mapping of agro-morphological characters among the global collection of finger millet genotypes using genomic SSR markers

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Abstract

Identification of alleles responsible for various agro-morphological characters is a major concern to further improve the finger millet germplasm. Forty-six genomic SSRs were used for genetic analysis and population structure analysis of a global collection of 190 finger millet genotypes and fifteen agro-morphological characters were evaluated. The overall results showed that Asian genotypes were smaller in height, smaller flag leaf length, less basal tiller number, early flowering and early maturity nature, small ear head length, and smaller in length of longest finger. The 46 SSRs yielded 90 scorable alleles and the polymorphism information content values varied from 0.292 to 0.703 at an average of 0.442. The gene diversity was in the range of 0.355 to 0.750 with an average value of 0.528. The 46 genomic SSR loci grouped the 190 finger millet genotypes into two major clusters based on their geographical origin by the both phylogenetic clustering and population structure analysis by STRUCTURE software. Association mapping of QTLs for 15 agro-morphological characters with 46 genomic SSRs resulted in identification of five markers were linked to QTLs of four traits at a significant threshold (P) level of ≤0.01 and ≤0.001. The QTL for basal tiller number was strongly associated with the locus UGEP81 at a P value of 0.001 by explaining the phenotypic variance (R 2) of 10.8 %. The QTL for days to 50 % flowering was linked by two SSR loci UGEP77 and UGEP90, explained 10 and 8.7 % of R 2 respectively at a P value of 0.01. The SSR marker, FM9 found to have strong association to two agro-morphological traits, flag leaf width (P—0.001, R 2—14.1 %) and plant height (P—0.001, R 2—11.2 %). The markers linked to the QTLs for above agro-morphological characters found in the present study can be further used for cloning of the full length gene, fine mapping and their further use in the marker assisted breeding programmes for introgression of alleles into locally well adapted germplasm.

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Acknowledgments

The authors grateful to Dr. HD Upadhyaya, ICRISAT, Hyderabad for providing the finger millet mini-core germplasm.

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Authors and Affiliations

  1. Department of Molecular Biology and Genetic Engineering, College of Basic Sciences & Humanities, G.B. Pant University of Agriculture and Technology, Pantnagar, 263-145, India

    B. Kalyana Babu, Dinesh Pandey, J. P. Jaiswal & Anil Kumar

  2. Vivekananda Parvateeya Krishi Anusanthan Sansthan (VPKAS), Almora, 263601, India

    B. Kalyana Babu & P. K. Agrawal

Authors
  1. B. Kalyana Babu
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  2. P. K. Agrawal
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  3. Dinesh Pandey
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  4. J. P. Jaiswal
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  5. Anil Kumar
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Correspondence to B. Kalyana Babu or Anil Kumar.

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Kalyana Babu, B., Agrawal, P.K., Pandey, D. et al. Association mapping of agro-morphological characters among the global collection of finger millet genotypes using genomic SSR markers. Mol Biol Rep 41, 5287–5297 (2014). https://doi.org/10.1007/s11033-014-3400-6

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  • DOI: https://doi.org/10.1007/s11033-014-3400-6

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