Morphological Variability and Yield Traits Association In Backcross Derived Rice Population for Anaerobic Germination Tolerance
Bokka Kiranmayee *
Department of Genetics and Plant Breeding, COA, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh, India and Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
Anantha M. S
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
C. Gireesh
ICAR- Indian Institute of Seed Science, Bengaluru, Karnataka, India.
Prabha Rani Chaudhari
Department of Genetics and Plant Breeding, COA, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh, India.
S. L. Krishnamurthy
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
P. Senguttuvel
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
S. V. Saiprasad
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
Shruti
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
Rohit M.V.S.K
Department of Genetics and Plant Breeding, COA, Indira Gandhi Krishi Vishwavidyalaya, Raipur, Chhattisgarh, India.
Eshwar
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
Akshay
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
R.M. Sundaram
Crop improvement Section, ICAR-Indian Institute of Rice Research, Hyderabad, Telangana, India.
*Author to whom correspondence should be addressed.
Abstract
In the current study BC2F1 Backcross population derived from cross between DRR Dhan 60 (elite recurrent parent) and Kho (donor with anaerobic germination (AG) tolerance) was evaluated in an augmented block design along with parental checks for genetic variability and trait association for yield-related traits. The objective was to assess AG1 QTL introgression potential into DRR Dhan 60. Genetic parameters including phenotypic and genotypic coefficients of variation, broad sense heritability (h²bs), and genetic advance (GAM) were evaluated. Results revealed significant variability in key traits, with high heritability (>80%) for plant height (PH), panicle length, and kernel length. Grain yield per plant (GYP) showed strong positive correlation with Plant height (PH) and moderate correlations with flag leaf dimensions, suggesting these traits as effective selection markers. The population displayed recovered genetic background stability from DRR Dhan 60 while introducing AG1-derived variation. Findings demonstrate that Plant height and yield components are prime targets for direct selection, whereas other traits may require later-generation selection. This work provides a framework for developing climate-resilient, direct-seeded rice varieties.
Keywords: Rice breeding, anaerobic germination tolerance, backcross population, Quantitative Trait Loci (QTL), genetic variability, direct-seeded rice