Allele mining for Granule Bound Starch Synthase1 (GBSS1) gene governing amylose content in aromatic rice (Oryza sativa L.) germplasm
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Abstract
The current research investigated sequence polymorphism and allelic variation in the GBSS1 gene responsible for determining the apparent amylose content (AAC) in an aromatic rice germplasm panel. Analysis of 271 germplasm accessions from India revealed a wide range of variation in AAC, from 4.81% (Manipur Black Rice) to 35.88% (IGSR -3-1-5). Re-sequencing and sequence analysis of a representative subset of 28 accessions unveiled a nucleotide diversity (π) of 0.00374, identifying 72 sequence variants. Two novel non-synonymous SNPs were identified: a G/A transition in exon 2, resulting in the substitution of glutamic acid at the 91st position with lysine, and a C/T transition in exon 11, substituting alanine at the 468thposition with valine. Additionally, two previously reported SNPs were validated: A/C in exon 6 (Tyr224Ser) and C/T in exon 10 (Pro415Ser). Furthermore, a 23 bp exon 2 duplication was found in Manipur Black Rice (4.81%), Bhogali Bora (6.20%), and NJ-72 (7.36%), indicating the prevalence of this allele in the very low AAC category (3–9%) in addition to the glutinous or waxy rice category with 0–2% AAC. These findings are significant for manipulating starch content in aromatic rice germplasm.
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