Indian Journal of Genetics and Plant Breeding (The)
SCOPUSWeb of Science
  • Year: 2026
  • Volume: 85
  • Issue: 4

Exploring the effects of qDTY2.1 genomic regions on yield related traits in rice (Oryza sativa L.) under well watered conditions

  • Author:
  • Subhadra Pattanayak$, Asit Prasad Dash1, Parameswaran Chidambaranathan2, Milan Kumar Lal2, Ramlakhan Verma2, Madhuchhanda Parida2, Subhasmita Sahoo2, Sarmistha Sarangi2, Rashmirekha Sahoo2, Gyanisha Nayak2, Sanghamitra Samantaray2, Jawahar Lal Katara2*
  • Total Page Count: 9
  • Page Number: 555 to 563

1Present address: Department of Genetics and Plant Breeding, Faculty of Agricultural Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar751 029, Odisha, India

2Crop Improvement Division, ICAR-Central Rice Research Institute (CRRI), Cuttack753 006, Odisha, India

$Present address: Department of Genetics and Plant Breeding, Faculty of Agricultural Sciences, Siksha ‘O’ Anusandhan (Deemed to be University), Bhubaneswar751 029, Odisha, India

*Corresponding Author: Jawahar Lal Katara, Crop Improvement Division, ICAR-Central Rice Research Institute, Cuttack753 006, Odisha, India, E-Mail: jawaharbt@gmail.com

Abstract

The quantitative trait locus qDTY2.1 regulates yield under drought stress in rice. This study investigates the role of qDTY2.1 on yield- related traits in rice under well-watered conditions. For comparison, a large qDTY2.1 region (Chr02: 10.7-17.68 Mbp) and its fine-mapped segment (Chr02:10.7-11.4 Mbp) were compared to understand the linkage drag effects. Out of 432 F2 population derived from a cross between Swarna Sub1 and CR Dhan 801 (qDTY2.1 and qDTY3.1), 132 lines possessing only the qDTY2.1 were evaluated for the yield- related traits in well-watered conditions. This analysis showed similar effects for the large (Chr02: 10.7-17.68 Mbp) and fine-mapped (Chr02:10.7-11.4 Mbp) qDTY2.1 region. Besides, the effect of the six haplotypes (two parental and four recombinants) significantly differed (p <0.05) for productive tillers, unfilled grains, and 100-seed weight. Based on the expression in the panicle stage, two candidate genes, namely, a meristem regulator gene (Os02g0293300; OsFDML1; Chr02:11.15 Mb) annotated as Arabidopsis homolog of factor of DNA methylation 1 and calcineurin B-like (Os02g0291000; OsCBL7; Chr02:11.01 Mb), were identified, which may regulate the yield-related traits in well-watered conditions. Thus, the present findings indicated the statistical effect of large and fine-mapped qDTY2.1 and their haplotypes in affecting the yield-related traits in well-watered conditions.

Keywords

Quantitative trait locus, qDTY2.1, rice, haplotype, yield, well-watered conditions