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ARS Home » Southeast Area » Stuttgart, Arkansas » Dale Bumpers National Rice Research Center » Research » Publications at this Location » Publication #413930
Research Project: Broadening and Strengthening the Genetic Base of Rice for Adaptation to a Changing Climate, Crop Production Systems, and Markets

Location: Dale Bumpers National Rice Research Center

Title: Identification of genetic loci for grain traits and disease resistance reveals a potential trade off in rice

Author
item Jia, Yulin
item Jia, Melissa
item Dunlap, Heather

Submitted to: PhytoFrontiers
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/22/2024
Publication Date: 8/23/2024
Citation: Jia, Y., Jia, M.H., Dunlap, H.N. 2024. Identification of genetic loci for grain traits and disease resistance reveals a potential trade off in rice. PhytoFrontiers. https://doi.org/10.1094/PHYTOFR-03-24-0025-R.
DOI: https://doi.org/10.1094/PHYTOFR-03-24-0025-R

Interpretive Summary: The genetic mechanism of tradeoffs between grain traits and disease resistance is poorly understood in rice. The objective of this study was to map the genes for grain traits, including main panicle weight, grain length, width and thousand grain weight, using a genetic linkage map of a recombinant inbred line population MHM. The MHM population along with the parents Minghui63 and M-202 were grown in replicated field plots. Grain length and width were measured by WinSEEDLE. Grain weight was measured using a balance. A total of 7 loci for grain length, 4 for grain weight, and 5 for thousand grain weight were mapped on 9 chromosomes. One thousand grain weight locus qTGW2 and one grain width locus qWIG2.2 were mapped at the known blast resistance gene Pi-b on rice chromosome 2. Another thousand grain weight locus qTGW3.3 and grain length locus qLNG3.3 were mapped at qBLAST3 on rice chromosome 3. Further studies of genes at these loci will reveal potential tradeoffs between disease resistance and productivity. This knowledge is important for breeders to develop high yielding and disease resistant rice varieties.

Technical Abstract: Understanding how plants utilize limited resources for reproductivity and disease resistance can improve the efficiency of plant breeding. In the present study, we mapped genes for grain traits including main panicle weight, grain length and width, and thousand grain weight. A previously constructed linkage map of a recombinant inbred line population was used, which was derived from a cross between an indica restore rice variety Minghui63 and a temperate japonica rice variety M-202. The MHM population was grown in replicated field plots and grain trait data were collected. Upon 3-year field evaluation 2016-2018, a total of 16 loci were mapped on 9 of 12 chromosomes, including 7 for grain length, 4 for grain weight, and 5 for thousand grain weight. A thousand grain weight locus qTGW2 a grain width locs qWIG2.2 were mapped at known blast resistance locus qBLAST2 on chromosome 2 that harbors a major blast resistance allele Pi-b Another thousand grain weight locus qTGW3.3 and a grain length locus qLNG3.3 were mapped at qBLAST3 on chromosome 3. These results reveal potential tradeoffs between disease resistance and productivity, which is important for breeders to develop high yielding and disease resistant rice varieties.