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Superior Haplotypes for Early Root Vigor Traits in Rice Under Dry Direct Seeded Low Nitrogen Condition Through Genome
Annamalai Anandan1,2, Siddharth Panda1,3, S Sabarinathan1
1Crop Improvement Division, Indian Council of Agricultural Research (ICAR)-National Rice Research Institute (NRRI), Cuttack, India.
Frontiers in Plant Science
|July 25, 2022
Summary
Direct seeded rice (DSR) cultivation requires early root vigor for optimal growth. This study identified key genes and quantitative trait loci (QTLs) for enhanced root development in rice under limited nitrogen conditions, crucial for DSR systems.
Area of Science:
- Agricultural Science
- Plant Biology
- Genetics
Background:
- Increasing global food demand necessitates efficient agricultural practices like direct seeded rice (DSR).
- DSR systems offer reduced water and labor use, improved productivity, and lower greenhouse gas emissions.
- Early root vigor is critical for crop establishment, nutrient uptake, and weed competition in DSR.
Purpose of the Study:
- To understand the genetic basis of early root growth in the DSR-adapted 'aus' rice subpopulation.
- To identify quantitative trait loci (QTLs) and candidate genes associated with root traits under limited nitrogen.
Main Methods:
- Evaluation of the 'aus' rice subpopulation for root traits at 14 and 28 days post-germination.
- Genome-wide association study (GWAS) using 2 million single-nucleotide polymorphisms (SNPs).
- Identification of significant QTLs (p < 0.0001) and exploration of candidate genes involved in root architecture and nutrient acquisition.
Main Results:
- Positive correlation found between shoot dry weight and root dry weight.
- Identified 97 QTLs associated with root traits, including novel QTLs on chromosome 7 for root length.
- Discovered candidate genes like peptide transporters (PTR5, PTR6) on chromosome 4 involved in nitrogen mobilization.
Conclusions:
- Candidate genes and QTLs with superior haplotypes for early root vigor were identified.
- These findings can aid in developing improved rice genotypes for direct seeded rice cultivation.
- Understanding root biology under nutrient stress is key for sustainable agriculture.
