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United States Department of Agriculture

Agricultural Research Service

Research Project: Using Genetic Approaches to Reduce Crop Losses in Rice Due to Biotic and Abiotic Stress

Location: Dale Bumpers National Rice Research Center

Title: Exploring optimization of weed suppression, yield, and biotic stress tolerance in an allelopathic X non-allelopathic rice mapping population

Authors
item Gealy, David
item Jia, Yulin
item Pinson, Shannon

Submitted to: International Allelopathy Congress
Publication Type: Abstract Only
Publication Acceptance Date: February 28, 2014
Publication Date: N/A

Technical Abstract: Indica rice cultivars such as PI 312777 can be highly productive as well as suppressive to barnyardgrass (Echinochloa crus-galli) in drill-seeded systems in the US. To understand the molecular basis of the important genes underlying crop productivity, weed suppression, and disease resistance, a recombinant inbred line (RIL) population was developed using single seed descent from a cross between ‘Katy’, a moderate-yielding, non-weed-suppressive tropical japonica, and PI 312777, a high-yielding allelopathic indica. A mapping population of 350 RILs (presently F6 generation) has been developed. The phenotypic traits being evaluated are: emergence and plant growth rates; number, timing, and angle of tillers produced; leaf area; height; yield; root architecture, allelopathic activity, and weed suppression; and blast disease reactions. Greenhouse experiments are ongoing, and field and high-throughput growth chamber experiments will be conducted 2014-2016. Important genomic regions associated with the evaluated traits will be determined using Genotyping by Sequencing or other appropriate genotyping methods. This mapping population, with the accompanying genetic and phenotypic information, will provide a foundation for conducting association mapping studies that will lead to a better understanding of the genetic control of yield, weed-suppression, and disease resistance traits.

Last Modified: 10/23/2014
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