Protein To Improve Grain Yield in Both Maize and Rice IdentifiedApril 20, 2022
Researchers were able to identify a protein that regulates a quantitative trait locus that has the potential to increase kernel row number in maize ears and grain number per rice plant. They did this by comparing a specific genetic region in each plant and the results could provide opportunities for developing improved crops with enhanced production.
Maize and rice are two of the world's most economically important crops. However, there is limited knowledge about the extent of molecular convergence on a genome-wide scale between maize and rice. To address this, scientists investigated the functions and molecular evolution of the grain yield quantitative trait locus KRN2 in maize and its rice ortholog OsKRN2.
After selection in the non-coding upstream genetic regions that resulted in the reduction of KRN2 expression, it was found that this resulted in an increase in maize kernel rows. Rice's OsKRN2 ortholog also went through selection and it was found that it negatively regulates grain number by controlling the secondary pinnacle branches. These orthologs were found to encode WD40 proteins that function along the DUF1644 gene, suggesting that a conserved protein interaction controls grain number in both maize and corn. The crops then underwent field testing to test the effects of knocking out KRN2 in maize and OsKRN2 in rice. The crops exhibited an increase in yield – about 10% for maize and about 8% in rice. There was also no agronomic trait trade-off observed.
Further genome-wide scale investigation identified a set of 490 orthologous genes that underwent convergent selection during maize and rice evolution, and these include the KRN2 and OsKRN2. This is an evolutionary and function evidence of the convergent selection of KRN2 and OsKRN2 for grain number between the two crops. Gene editing experiments using these genes and orthologs determined that a similar phenotype increasing grain number per plant can be repeated. Such findings are important for crop improvement research.
Learn more in Science.
You might also like:
- Increase in Maize Yield Results from Overexpression of Single Gene
- Scientists Discover Gene that Improves Yield and Fertilizer Use Efficiency of Rice
- Green Revolution Genes Promise More Yield
Biotech Updates is a weekly newsletter of ISAAA, a not-for-profit organization. It is distributed for free to over 22,000 subscribers worldwide to inform them about the key developments in biosciences, especially in biotechnology. Your support will help us in our mission to feed the world with knowledge. You can help by donating as little as $10.
See more articles:
Research and Tools
- Protein To Improve Grain Yield in Both Maize and Rice Identified
- Conscious™ Foods Soon to Release Gene-Edited Leafy Greens
- Researchers Present Three-pronged Strategy to Drive Genetic Improvement of Cattle
Trends and Impact
- Report Projects Global Gene Editing Market Trends 2022-2026
Public Acceptance and Engagement
- Experts Address Top Perceived Risks of Genome-Edited Crops
- UK's GM Pioneers Laud Easing of Gene Editing Rules
Read the latest:
- Biotech Updates (November 29, 2023)
- Gene Editing Supplement (November 29, 2023)
- Gene Drive Supplement (February 22, 2023)
Subscribe to BU: