A distorter-restorer system drives quantitative reproductive isolation in rice.
Zhang Y, Yang Y, Shi C, Pu Q, Zhou J
Crispr
Disabling a single gene could allow breeders to cross wild rice relatives with cultivated rice, potentially creating new varieties with better drought tolerance, disease resistance, or yields — directly affecting the food on your plate.
When you cross two different rice species, the offspring are often sterile — like mules — because of genetic conflicts inherited from each parent. Researchers found a cluster of four genes in wild African rice that act like a saboteur-bodyguard pair: one gene destroys pollen from the cultivated parent while another protects the wild parent's own pollen. By using CRISPR gene editing to knock out the saboteur gene, they could make these crosses fertile again, unlocking wild rice's traits for use in breeding programs.
Key Findings
A four-element genetic system (RID, RIR, RIA, RIS) at the S44 locus controls both hybrid sterility and biased gene inheritance in crosses between wild Oryza longistaminata and cultivated Asian rice.
The distorter gene RID eliminates pollen from cultivated rice variety RD23, while the restorer gene RIR selectively protects wild rice gametes, skewing inheritance toward the wild parent's alleles.
CRISPR knockout of the single RID gene universally overcomes S44-mediated reproductive barriers across the entire AA genome group of rice, enabling previously impossible cross-species breeding.
chevron_right Technical Summary
Scientists discovered a four-gene system in rice that causes hybrid plants to be sterile and skews which parent's genes get passed on. Using CRISPR to disable one key gene removes this barrier, opening the door to breeding across rice species that were previously incompatible.
Abstract Preview
Hybrid sterility and segregation distortion are the major forms of postzygotic reproductive isolation in rice, yet the molecular basis of their quantitative variation remains unclear. Here we ident...
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Rice is a cereal grain and in its domesticated form is the staple food of over half of the world's population, particularly in Asia and Africa. Rice is the seed of the grass species Oryza sativa —or, much less commonly, Oryza glaberrima. Asian rice was domesticated in China some 13,500 to 8,200 y...