Decoding how rice fights off the false smut fungus
Parmar P, Bashyal BM
Crop Improvement
Rice feeds half the planet, and false smut turns healthy grains into useless black spore balls, so knowing which rice genes resist the fungus is the first step toward varieties that keep more of your harvest edible.
A fungus called Ustilaginoidea virens infects rice flowers and turns developing grains into dark, powdery balls, a disease known as rice false smut that's spreading worldwide. Researchers gathered everything known about the genes the fungus uses to invade and the genes rice switches on to defend itself. With that map, breeders can combine natural resistance genes or use gene editing to build rice plants that shrug off the disease.
Key Findings
The fungus infects in stages, from spore germination to hyphal colonization of floral tissues and finally smut ball formation, driven by cAMP-MAPK signaling, cell wall integrity factors, and carbohydrate-active enzymes.
Rice defends itself by activating phytoalexin biosynthesis, pathogenesis-related proteins, receptor-like kinases, transcription factors, and antioxidant genes.
Mapping resistance genes to quantitative trait loci and short sequence repeats supports gene pyramiding and CRISPR-Cas9 editing for breeding resistant varieties.
chevron_right Technical Summary
Scientists reviewed how the fungus behind rice false smut attacks rice plants and how rice fights back at the genetic level. Understanding this back-and-forth points to ways of breeding rice varieties that can resist a disease increasingly threatening the world's rice supply.
Abstract Preview
Original paper
A comprehensive exploration of molecular aspects of rice-Ustilaginoidea virens interactions.
Rice false smut (RFS) caused by Ustilaginoidea (U.) virens has become an emerging threat to global rice production, driven by complex host-pathogen interactions and stage-specific infection process...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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