Publications by authors named "Bon-Hyuk Koo"
Flowering time (or heading date) is controlled by intrinsic genetic programs in response to environmental cues, such as photoperiod and temperature. Rice, a facultative short-day (SD) plant, flowers early in SD and late in long-day (LD) conditions. Casein kinases (CKs) generally act as positive regulators in many signaling pathways in plants.
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- Heading date and photoperiod sensitivity are key traits for rice to thrive in various environments, with Oryza sativa Pseudo-Response Regulator37 (PRR37) identified as a crucial gene influencing early and late heading through quantitative trait locus (QTL) mapping.
- A mutation in the PRR37 gene was found in the early-heading rice variety H143, which allows it to flower earlier compared to the late-heading variety Milyang23 (M23).
- Genetic analysis shows that different PRR37 and Ghd7 alleles work together to adapt rice to cooler regions, enabling japonica varieties with nonfunctional alleles to flower early in long-day conditions, thus expanding rice cultivation to higher latitudes.
Natural variation in heading-date genes enables rice, a short-day (SD) plant, to flower early under long-day (LD) conditions at high latitudes. Through analysis of heading-date quantitative trait loci (QTL) with F7 recombinant inbred lines from the cross of early heading 'H143' and late heading 'Milyang23 (M23)', we found a minor-effect Early Heading3 (EH3) QTL in the Hd16 region on chromosome 3. We found that Early flowering1 (EL1), encoding casein kinase I (CKI), is likely to be responsible for the EH3/Hd16 QTL, because a missense mutation occurred in the highly conserved serine/threonine kinase domain of EL1 in H143.
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