Scientists find the gene behind pale, stunted rice plants
Wang C, Ye S, He Y, Chen W, Jiang D
Crispr
If you've ever wondered why some seedlings in a garden bed come up pale and weak while their neighbors thrive, this gene offers a concrete answer: a single DNA change can throw off a plant's chlorophyll production, its ability to photosynthesize, and even its pollen quality all at once.
Researchers found a mutant rice plant that grows yellow-green instead of healthy green, sprouts fewer side stems, and makes less seed. By tracking down the exact gene responsible and testing it with gene-editing tools, they confirmed this one gene controls how well the plant builds its chloroplasts (the tiny solar panels inside leaf cells) and how it responds to light. Knowing which gene does this gives breeders a clear target for growing hardier, higher-yielding rice.
Key Findings
CRISPR/Cas9 knockout of LOC_Os01g73450 reproduced the yellow-green leaf phenotype, while restoring the wild-type gene fixed it, confirming the gene's role.
Mutant (ygrt) plants showed reduced chlorophyll content, lower net photosynthetic rate, higher intercellular CO2, and defective chloroplast structure with loosely arranged grana lamellae and small vesicles.
Mutant plants also had reduced tiller number, lower seed setting rate, and abnormal pollen (lighter I2-KI staining, oval/irregular shapes) linked to delayed tapetum degradation.
chevron_right Technical Summary
Scientists identified a gene that controls leaf color and tiller growth in rice, discovering that when it's disabled, plants turn yellow-green, grow fewer stems, and produce less seed. The finding gives rice breeders a new genetic target for understanding chloroplast development and potentially improving crop yield.
Abstract Preview
Original paper
Gene cloning and functional characterization of a yellow-green leaf and reduced tillering mutant in rice.
Leaf color mutants are valuable genetic resources for elucidating chloroplast development and photosynthetic regulation in rice. In this study, a stably inherited yellow-green leaf and reduced till...
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