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      https://www.ias.ac.in/article/fulltext/jgen/100/0008

    • Keywords

       

      glycaemic index; starch biosynthetic genes; pooled amplicon sequencing; single-nucleotide polymorphisms; molecular docking; allele frequencies.

    • Abstract

       

      Rice is the foremost crop catering to the major calorific requirement of the human population but has the disadvantage ofhaving high glycaemic index (GI). The fine quality rice varieties, BPT and RNR have been recently identified as having low GI in natureand are grown mostly in southern parts of India. Starch (80%) is the major component of rice endosperm attributing to GI. The study aimedto unravel the molecular basis of low GI through targeted pooled amplicon sequencing of major starch biosynthetic genes. A total of 13candidate genes involved in starch synthesis were amplified and pooled in equimolar proportion for sequencing. Single-nucleotidepolymorphisms (SNP$_{s}$) and insertions/deletions (Indels) were detected in both coding and noncoding regions. Among the genes that areunder study, the highest number of variations were identified in starch synthase I (SSI) followed by starch synthase IIIA (SSIIIA) genes.Nonsynonymous SNP$_{s}$ with high probability of effecting gene function were validated by Sanger sequencing and molecular docking.Identified causative SNP$_{s}$ were mapped on 3000 rice genome database and their allele frequencies were obtained. The outcome of this studyhas a potential to be applied in breeding programmes to obtain low GI rice varieties with added beneficial traits.

    • Author Affiliations

       

      PRIYA B. N. V.1 ARUN PANDIYAN I.1 T. V. REDDY2 VINAY K.3 AMARNATH M.1 CHIDANAND U.1 HEMANTH V.1 SAIPRASAD G. V. S.1

      1. ITC Limited, ITC Life Sciences and Technology Centre, Peenya Industrial Area, 1st Phase, Bengaluru 560 058, India
      2. ITC-ABD R&D Division, Rajahmundry 53 3107, India
      3. Karolinska Institute, 17177 Stockholm, Sweden
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