Dual repression of OsSnRK1β1A by the deubiquitinase OsOTUB1 orchestrates energy metabolism and grain yield in rice.
Zhang L, Wang P, Li Y, Yang S, Chen Y
Crispr
Rice feeds more than half the world's population, and every grain on a panicle — that feathery seed head you see swaying in paddy fields — is the result of a molecular tug-of-war this research just decoded, opening a path to growing more food on the same land.
Inside rice plants, there's a protein that acts like a traffic controller for energy — deciding whether the plant spends its resources on growth or on making seeds. Researchers found another protein that keeps this controller in check, and together they determine how many rice grains form per stem. By tweaking the DNA instructions that control the energy-traffic protein using CRISPR editing, scientists were able to reliably boost grain counts without making the plants weaker or oddly shaped.
Key Findings
A regulatory protein called OsSnRK1β1A promotes grain number by suppressing energy breakdown, and a deubiquitinase called OsOTUB1 degrades it via the 26S proteasome — balancing the plant's reproductive output.
OsSnRK1β1A controls where a key energy-sensing enzyme (OsSnRK1α1) is allowed to go inside the cell through a chemical tag called myristoylation, linking the plant's energy state directly to how many grains it produces.
CRISPR/Cas9 editing of two promoter elements (CAREOSREP1 and CCAAT-box) to boost OsSnRK1β1A activity consistently increased grain yield in rice without altering plant architecture.
chevron_right Technical Summary
Scientists discovered a molecular switch in rice that controls how many grains grow per plant. By engineering this switch with CRISPR gene editing, they consistently increased rice grain yield without changing the plant's overall structure.
Abstract Preview
Rice grain yield is largely determined by grain number per panicle, however,the molecular basis for this key trait remains elusive, particularly regarding how energy metabolism coordinates with pan...
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