Cis-regulatory editing of SD1 promoter enhances TCP19-mediated repression to optimize plant height in Kam sweet rice.
Wu B, Luo H, Xie H, Zhao C, Xie P
Crispr
Tall rice stalks snap in storms, flatten entire paddies overnight, and can wipe out a harvest that took months to grow — this editing technique offers a way to keep heritage rice varieties standing without sacrificing their unique taste.
Kam sweet rice is a prized aromatic variety, but it grows so tall that it easily falls over, ruining crops. Researchers made a tiny, targeted change to a gene that controls how much of a natural growth hormone (gibberellin) the plant produces, essentially turning down the volume on a gene that drives stem lengthening. The result: shorter, sturdier plants that still produce the same amount of grain with the same quality.
Key Findings
Inserting a single adenine (a DNA building block) into the SD1 gene's control region was enough to significantly reduce plant height by boosting the natural repressive grip of the TCP19 protein.
Edited rice lines maintained equivalent grain yield and nitrogen use efficiency compared to unmodified plants, confirming no productivity trade-off.
Cell-level analysis showed the height reduction came from shorter individual cells in the stem internodes, not fewer cells — a clean, precise phenotypic outcome.
chevron_right Technical Summary
Scientists used CRISPR gene editing to make a fragrant traditional rice variety shorter and sturdier — without reducing grain yield or affecting its distinctive flavor and quality. The tweak works by fine-tuning a natural growth-suppression switch already built into the plant's DNA.
Abstract Preview
This study demonstrates that CRISPR-mediated cis-regulatory element editing (CRE editing) of the SD1 promoter effectively reduces plant height in Kam sweet rice, without compromising yield or grain...
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